Method for controlling power of transmission through information channel of direct communication line

FIELD: radio communication networks, in particular, methods and devices for controlling transmission power.

SUBSTANCE: in accordance to the method, power of transmission through direct communication line to a client terminal in composition of a radio communication system, which contains a set of rays, is controlled by means of determining baseline power level, Pbaseline, on basis of accepted effective signal to noise ratio (SNR) in control channel; marginal value of power, Pmargin, is determined on basis of detected sensitivity to interferences; and correction of power level, Pcorrection, is determined on basis of determined packet error coefficient (PER); and Ptransmit is set on basis of Pbaseline, Pmargin and Pcorrection. For example, Ptransmit may be set to power level which is essentially equal to a total of Pbaseline, Pmargin and Pcorrection. Each component, Pbaseline, Pmargin and Pcorrection, may be determined by means of independently acting check connection circuits or processes.

EFFECT: weakening of interferences with simultaneously economized transmission power, in particular in composition of systems with limited energy potentials.

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Date convection priority of the present invention is October 25, 2001, In accordance with the filing date of provisional patent application No. 60/335749, filed, entitled "System and method for controlling transmit power for data channel direct line in the US and completely incorporated into the present application by reference.

The present invention generally relates to radio communications networks. In particular, the present invention is to methods and devices for regulating power transfer.

There are many radio communication systems with multiple directional communication lines. One relevant example is the satellite communication system. Another example is a cellular communication system.

The satellite communication system contains at least one satellite to relay radio signals from nodal stations to the subscriber terminal, and Vice versa. Nodal stations provide a communication line for connecting the user terminal to other subscriber terminals or subscribers of other communications systems, such as dial-up public telephone networks (PSTN). The subscriber terminal may be stationary or mobile and may be located near the hub station or away from it.

The satellite can receive signals from the subscriber terminal or transfer it alerts the crystals only if that the user terminal is within the coverage area of the satellite. The service area of the satellite is a geographical area on the earth's surface covered by a satellite communication system. Some satellite communication systems, the service area of the satellite is geographically divided into "rays" through the use of lucabrasi antennas. Each beam covers a specific geographic area within the coverage area of the satellite.

Some satellite communication systems use signals with spread spectrum multiple access code division multiple access (CDMA) in accordance with U.S. patent No. 4901307 "Spread Spectrum Multiple Access Communication System Using Satellite or Terrestrial Repeaters", issued February 13, 1990, and U.S. patent No. 5691174 "Method and Apparatus for Using Full Spectrum Transmitted Power in a Spread Spectrum Communication System for Tracking Individual Recipient Phase Time and Energy, issued November 25, 1997, the rights are transferred to the patent holder of the present invention and is incorporated into this description by reference.

In the United States industry Association communication tools standardized method for mobile communications CDMA standard TIA/EIA/IS-95-A Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System" (the"Standard compatibility mobile stations and base stations in a broadband two-mode cellular communications system spread spectrum")identified in the present description the Institute IS-95. The TIA/EIA IS-98 contains a description of the combined system AMPS (prospective service radiotelephone mobile communication) and CDMA. Descriptions of other communication systems are contained in the standards IMT-2000/UM (international mobile telecommunications - 2000 / Universal mobile telecommunications system), the standards related to systems, called wideband CDMA (WCDMA), cdma2000 (for example, standards for cdma2000 1x or 3x) or TD-SCDMA.

Cellular communications can also use the CDMA system. But instead of receiving signals from nodal stations that relayed at least one satellite user terminals receive signals from the base station serving multiple sectors, each of which corresponds to a specific geographical area, similar to the situation with the presence of several rays.

The hub station and the base station transmit information in the form of radio signals to user terminals through the channels of direct communication line. These signals you want to send with power levels sufficient to exceed above the noise and interference, in order to transmit information within the established coefficients of the error. The data signals should be transmitted with power levels that should not be too high so as not to interfere with communication with other subscriber t is renalof. In the context of the problem node and the base station using the methods of dynamic power control in a direct line of communication to ensure appropriate levels of transmission power in a straight line. Traditional methods of power control in a direct line of communication they use feedback, in accordance with which the subscriber terminals support with terminals and base stations feedback, which determines the adjustment of the transmission power in a straight line. For example, one of these techniques is that the user terminal determines the signal-to-noise ratio (SNR) for the information of signals received in a straight line. Based on these found SNR user terminal transmits commands, which instruct the hub station or base station to either increase or decrease the transmit power information signals transmitted in the subscriber terminal.

These commands are called commands strengthening/weakening, because they prescribe to increase or decrease the power. Team strengthening/weakening of the passed in node or base station control channel increase and decrease of power. This channel typically implement "vivarium" commands strengthening/weakening in the data frames from the user terminal that transmitted the node or base station. This flashing may limit information speed with which the user terminals transmit information to the node and the base station. In addition, stitched channels may not be as reliable as sewn team can lead to an increase of the ratio of bit errors at a given signal-to-noise.

In addition to sending commands strengthening/weakening, subscriber stations usually transmit other types of information in a node and the base station. For example, many user terminals periodically transmit different power measurements and noise measurements to provide functions such as switching between beams when the current connection. To eliminate the reduction in the reliability of commands transmission power control that limit information speed at the hub and base stations it is advisable to use the transmitted measurements to control the transmit power levels in a straight line.

It is also advisable to save the transmit power in a straight line. As satellite and cellular communication systems use multiple beams, the transmitted signals received by the subscriber terminal in a concrete beam, are susceptible to interference from transmitted signals intended for adjacent beams. The sensitivity of the user terminal to the room what am depends on its proximity to the adjacent beams. Namely, the closer the subscriber or the subscriber terminal to the adjacent beam, the more sensitive the subscriber to interference from adjacent beams.

In a satellite communication system with non-stationary satellites geographic area covered by this satellite is constantly changing. In the user terminal located within a particular satellite beam at one point of time, it may subsequently appear within another beam of the same satellite or within another beam of another satellite. Moreover, because the satellite connection is wireless, the user terminal can move without restriction. In the user terminals usually change their location within the beam in the process of reception of signals transmitted through the channels of direct communication line. Accordingly, the sensitivity of subscriber terminals to interference may change over time.

One of the ways the attenuation, the received subscriber terminal is to increase the power of signals transmitted by satellites and/or cellular base stations in the subscriber terminals, the threshold power. However, due to possible changes in the sensitivity of subscriber terminals to interference, this method has such a drawback, as the spending power is on subscribers, which is not as susceptible to interference as the others. In addition, this method can lead to the creation of additional interference to other subscriber terminals.

In accordance with the above, as in the case of exceptions user terminals that need to transmit commands to the power control feedback, there is a need for methods of attenuation while saving power transmission, particularly in systems with limited energy capacity.

The present invention relates to devices and methods for regulating transmit power, Ptransmitdirect communication line to the subscriber terminal in a telecommunication system with many rays. Systems and methods determine the source power level, Pbaseline, according to the ratio of signal to noise ratio (SNR) in the control channel; determine a threshold power value, Pmarginon the identified susceptibility to interference; determine a correction power level, Pcorrectionon the identified rate of packet errors (PER); set Ptransmit, PbaselinePmarginand Pcorrection. For example, Ptransmityou can set the power level, which is essentially equal to the sum of PbaselinePmarginand Pcorrection. The definition of each of these components can be performed with use what Itanium independently operating circuits or processes of governors.

The definition of Pbaselinemay contain stages, namely, that calculates the shift of power level Poand summarize the Powith the level of transmission power in the control channel. To determine the sensitivity of the subscriber terminal to interference may include the step consisting in that the subscriber terminal take a set of measurements of signal power.

Determining an adjustment to a power level of Pcorrectionmay contain stage, namely, that reveal the ratio of packet errors (PER) for the subscriber terminal. The definition of Pcorrectionmay contain stages, namely, that increase Pcorrectionif the detected value of the PER is greater than the specified value, PER, and reduce Pcorrectionif the detected value of the PER is less than the specified values PER parameter.

Each of these measurements signal power corresponds to one of the many rays. For example, these measurements may be measurements of the power of the pilot signal, which is delivered in the message composition measuring the power of the pilot signal (PSMM). In accordance with other options, these measurements can be taken using signals of other types, such as messages, search call. Calculate the difference between the first measured signal strength (for example, by measuring the corresponding active beam, or the most the e powerful measurement) and each of the other measurements of signal power.

Pmarginset at a first power level, if the lower of the calculated differences is greater than the specified threshold. Or Pmarginset at the second power level if the lower of the calculated differences is less than or equal to the specified threshold. The first power level lower than the second power level.

In accordance with another variant, the detection sensitivity of the subscriber terminal to interference may contain stage, namely, that identify the location of the user terminal within one of the many rays. In this case Pmarginset at a first power level, if the detected location is within the area of intersection of the rays. Conversely, Pmarginset at a second power level, if the detected location is in the Central zone of the beam. The first power level is higher than the second power level.

Regulation Ptransmitcontains a selector, which determines PbaselinePmarginand Pcorrection. The transceiver sets the PtransmitPbaselinePmarginand Pcorrection. For example, Ptransmitset the power level, which is essentially equal to the sum of PbaselinePmarginand Pcorrection.

The advantage of the present invention is that it eliminates the neo is the divergence in the application of methods of control of transmit power in a straight line with feedback, under which user terminals transmit commands that designate certain adjusting transmit power in a straight line.

Another advantage of the present invention is that it maintains the levels of interference within acceptable limits while saving power transmission.

The description of the present invention is given with reference to the accompanying drawings. In the drawings, the same numerical position indicate identical or functionally similar elements. In addition, the leftmost digit numeric positions indicate the drawing, which for the first time using this numerical position.

In Fig. 1 depicts a typical communication system.

In Fig. 2 depicts a typical service area of the group of rays.

In Fig. 3 presents a scenario within the service area of the satellite.

In Fig. 4 - 6 presents a flowchart depicting the sequence of operations in accordance with the embodiment of the present invention.

In Fig. 7 shows a block diagram of a variant of implementation of a typical junction.

In Fig. 8 shows a block diagram of a variant of implementation of the transceiver in a straight line.

I. Typical operating environment

Before a detailed description of embodiments of the present invention, it is advisable to bring opisaniemopyta operating environment, where it is possible to implement the present invention. The present invention is particularly useful in the environment of a mobile communication system. In Fig. 1 shows the operating environment.

In Fig. 1 presents a block diagram of a typical system 100 radio (WCS), which contains the base station 112, two satellites 116a and 116b and the two nodal station (also called text hubs) 120a and 120b. These elements interact as part of a system of radio communication with the subscriber terminals 124a, 124b and 124c. Base station, satellites and the hub are usually components of the various terrestrial and satellite communication systems. However, these separate systems can interact as a single shared communication infrastructure.

Although in Fig. 1 shows one base station 112, two satellites 116 and two hub station 120, it is possible to use any number of data elements to provide the required bandwidth and latitude. For example, a typical implementation of WCS 100 contains at least 48 satellites moving in eight different orbital planes at low earth orbits (LEO), to serve a large number of user terminals 124.

The terms base station and a base station is sometimes also used interchangeably, when each of these stations is a hundred is yearnow Central station communication despite the fact that under terminals, such as terminals 120, in this technical field refers to highly specialized base stations, which provide a direct connection through the relay satellites, while the base station (sometimes also called nodes cellular), such as base station 112, using a terrestrial antenna for direct communication with the surrounding geographical areas. However, the present is not limited to communication systems with multiple access and can be used in systems other types that use other access methods.

In the above example, user terminals 124, each of which contains a device or a radio communications device, for example, but without limitation, a cellular telephone, a cordless telephone, a data transceiver, or receiver pager or positioning system. Moreover, each of the user terminals 124 may be, on demand, manual, portable or on-Board (installed, including on Board cars and trucks, ships, Railways and aircraft) or stationary. For example, in Fig. 1 shows a user terminal 124a in the form of a landline phone, the subscriber terminal 124b in the form of a handheld device and the user terminal 124c in the form of an onboard device. Device Radiocommunication part of some who ystem communication is sometimes referred to as subscriber terminals, mobile stations, mobile units, subscriber units, mobile radios or cordless phones, wireless installations, terminals, or simply "users, subscribers and mobile users", depending on preferences.

User terminals 124 interact in radio systems with other elements in the composition of WCS 100 using multiple access code division multiple access (CDMA). However, the present invention can be used in systems that use other means of communication, for example, multiple access with time division multiplexing (TDMA) and multiple access frequency division multiple access (FDMA), or other of the above signals or methods (WCDMA (wideband CDMA), CDMA2000 ...).

Usually the rays from the source beam, such as base station 112 or satellites 116, cover different geographical areas in the specified schema. Rays with different frequencies, also referred to as CDMA channels, signals with frequency division multiplexing (FDM), or channels, or "podrukami can be directed so as to overlap in the same area. For experts in the field of technology it is also clear that the zone of action of the rays or the service area of several satellites or pattern of the multiple antennas of the base station is th can be so arranged, to completely or partially overlap in this area, depending on the design of communication systems or types of services offered and is there space diversity.

In Fig. 1 shows several typical paths of the signal. For example, the signal paths 130a-c provide for the exchange of signals between the base station 112 and the subscriber terminal 124. Similarly, the signal paths 138a-d provide for the exchange of signals between satellites 116 and subscriber terminals 124. The exchange of radio signals between satellites 116 and terminals 120 is performed on the signal paths 146a-d.

User terminals 124 is capable of bidirectional communication with the base station 112 and/or satellites 116 through various channels. This exchange of signals is performed at least one channel of a straight line or at least one channel of the reverse link. These channels transmit radio frequency (RF) signals on the signal paths 130, 138, and 146.

Channels direct communication line transmit information to the user terminals 124. For example, information channels direct line of communication to transmit signals carrying information such as encoded digitally speech and data. To receive and process this information, user terminal 124 needs to clock in ormational channel direct line of communication. The reception of the synchronization signal is performed by receiving the corresponding control channel direct line of communication, which is transmitted pilot signal.

In Fig. 1 shows several typical channels of forward and reverse links. Information channel 150 direct communication line transmits information signals from the base station 112 in the user terminal 124a. Terminal 124a receives the synchronization signal information channel 150 direct line of communication by receiving the pilot signals of the base station 112 control channel 152 a straight line. The signals in both channels information channel 150 and the control channel 152, via signal path 130a. Similarly, information channel 154 return line connection transmits information signals from the subscriber terminal 124a in the base station 112 via signal path 130a.

In the context of satellite communications using user terminal 124c, satellite 116a and the hub 120a, news channel 156 direct communication line, the control channel 158 direct lines of communication and information channel 160 reverse communication line transmit signals on the signal paths 146a and 138c. Thus, landlines usually contain one radiosignals path between the subscriber terminal and the base station, and satellite communications are usually contain at least two R biosignaling path between the subscriber terminal and a junction station, passing at least one satellite (excluding multipath).

In accordance with the foregoing radio communication in WCS 100 is carried out using CDMA. Thus, the signals on the forward and reverse links of the signal paths 130, 138, and 146, are signals that are encoded, spread spectrum and are separated by channels in accordance with the standards of the CDMA transmission. In addition, the data backward and forward lines, you can apply the interleaving blocks. The said blocks are transmitted frames (also called packages in the present description) of a given duration, for example, 20 MS.

The base station 112, satellites 116 and the hub 120 can adjust the power of the signals that they transmit information channels straight line in WCS 100. Specified power (referred to in the present description the transmit power on the information channel is a straight line) can be changed in accordance with the commands, queries, or feedback signals from user terminal 124 or depending on time. This ability changes over time can be applied periodically. For example, this feature can be used for personnel. In accordance with another variant of this feature can be used in connection with other time intervals, which is s can be longer or shorter frame. The above-mentioned adjustment of the power produced to provide the requirements to the coefficients of bit error (BER) and/or ratios of packet errors (PER) in a straight line, reduce noise and save power transfer.

For example, the hub station 120a may via satellite 116a on the information channel for direct communication line to transmit user terminal 124b signals with a transmit power that is different from the power transmission terminal 124c. In addition, the hub station 120a may change the transmit power of each of the next frame transmitted by a direct information channel of each straight line in the subscriber terminal 124b and s.

In accordance with the above description of the pilot signals provide timing and phase for the respective information signals. These signals bind to time contain a reference phase codes that enable subscriber terminal 124 to synchronize with the function of separation in frequencies and channels that are implemented nodal stations 124 and the base station 112. In addition, this provides the phase reference of the subscriber terminals 124 the possibility of coherently to demodulate the received information signals.

WCS 100 can provide on the above straight lines of different communication services, for example neskolko ostrye information (LDR) and high-speed data (HDR) services. Typical LDR service allows you to create direct lines of communication with information speeds 4 kbit/s and 9.6, and the typical HDR-service usually provides such high information rate, as 604 kbps or higher.

HDR-service may be pulsed in nature. This means that the traffic transmitted on the communication lines HDR service, may suddenly begin and end in unpredictable ways. Therefore, the communication line HDR-services may at some point to act with zero information rate, and the next moment may transmit with very high information rate, such as 604 kbit/S.

In Fig. 2 shows a typical chart 202 orientation of the satellite, known as the service area. As can be seen from Fig. 2, a typical area 202 service contains sixteen rays 2041- 20416. Each beam covers a certain geographical area, but usually there is some overlap of the beams. It is shown in Fig. 2 the service area of the satellite contains an internal beam (beam 2041), secondary rays (rays 2042- 2047and external rays (rays 2048- 20416). The directional pattern 202 represents the configuration for a specific set of directional diagrams, each of which is associated with a particular beam 204.

The absence of geometrical overlap of the beams 204 shown tol is to illustrative purposes. In practice, the contours of the pattern of each of the beams 204 extend far enough beyond the idealized boundaries shown in Fig. 2. However, the data pattern is attenuated outside the boundaries shown so that usually do not provide enough gain to support communication with the subscriber terminal 124 outside the "boundaries".

We can assume that each of the beams 204 covers a different area, based on proximity to one or more other rays and/or location within the directional diagrams of other rays. For example, in Fig. 2 shows the beam 2042with the Central area 206 and area 208 intersection. The area of intersection 208 contains the components of the beam 2042that are adjacent to the beams 2041, 2043, 2047, 2048, 2049and 20410. Due to this proximity to the user terminals 124 in the zone 208 (as well as in similar areas of other points), the higher the probability of switching to the adjacent beam than for user terminals 124, located in the Central area 206. However, the user terminals 124 located in areas likely to switch, for example in the area of 208 intersection should obviously take more interference from communication lines adjacent beams 204.

To illustrate this principle, Fig. 3 presents typical with whom Inari work within the area 202 service. This scenario involves the subscriber terminal 124d-f that communicates over a different beams of the satellite 116. In particular, the subscriber terminal 124d and 124e communicate with the satellite 116 by the beam 2042and terminal 124f communicates with the satellite 116 by the beam 2047. As can be seen from Fig. 3, user terminal 124d is located in the Central area of the beam 206 2042and terminal 124e is in the zone 208 of intersection of the beam 2042.

In accordance with the above description of the crossing area 208 is closer to the beam 2047than the Central area 206. Due to the specified proximity of the user terminal 124e, located in the crossing area 208 may be located within the more powerful amplification plot of the beam 2047than the user terminal 124d, located in the Central area 206. For example, shown in Fig. 3 scenarios subscriber terminal 124f receives the signal transmitted in a straight line 302 from the satellite 116. In addition, the subscriber terminal 124d and 124e accept this signal as attenuated transmitted signal 302' and 302". Although both data signal is weaker than the transmitted signal 302, the transmitted signal 302' stronger signal 302".

In addition to receiving data weakened transmitted signals, subscriber terminal 124d and 124e are also such signals, the PE adaweya in a straight line from the satellite 116, intended for their reception. In particular, the user terminal 124d 304 receives the signal transmitted in a straight line from the satellite 116, and the subscriber terminal 124e 306 receives the signal transmitted in a straight line from the satellite 116.

In a typical WCS 100 CDMA signals transmitted on the downlink in a concrete beam 204 are orthogonal coded. That is, the data signals usually do not create mutual interference. However, the CDMA signals transmitted on the downlink in different beams, not necessarily orthogonal, and therefore can create interference. In accordance with that depicted in Fig. 3 scenarios reception of the transmitted signal 304 are susceptible to interference from the transmitted signal 302'. Similarly, the reception of the transmitted signal 306 are susceptible to interference from the transmitted signal 302".

II. Logic power control

In communication systems, such as WCS 100, set the specific maximum values of BER and/or PER for signals transmitted via radio communication data systems to provide the required quality of service of the communication line (QoS). To channel provided the specified performance, exceeding the mentioned factors errors are not allowed, at least for a long time. The coefficients of the error of the channel depend on the ratio of the power levels to the / establishment, which is referred to in the present description signal-to-noise (SNR). This relationship is expressed by the following formula (1)

In equation (1) Ebmeans the amount of energy per transmitted bit, and Ntmean energy of the noise. Ntcontains two components: N0and It. N0means of thermal noise, and Itmean power of the interference.

In radio systems of type WCS 100 N0is relatively constant value. However, Itmay vary within wide limits. Because Itcan widely vary, the ratio represented by the formula (1)and the coefficients of the error in the respective communication lines can fluctuate within wide limits.

Such factors errors, as BER and PER, depend on the values of SNR. Namely, with increasing values of SNR data the coefficients of the error are reduced. Therefore, the increase of Ebby increasing the power of the signal transmitted through the channel of direct communication line, is one way of keeping the coefficients of the error is below the specified maximum levels. Unfortunately the radio system of type WCS 100 contain components, such as satellites 116, with limited available transmission power. This version of the invention provides the optimal allocation of this capacity for several information channels.

This is the information and communications technology offers such logic power control, which provides efficient power distribution transmission over communication channels, such as information channels direct communication line. In Fig. 4 presents a block diagram depicting the operation in accordance with this logic. Description of the operating procedure shown in example communication information channel direct line of communication hub 120a with the subscriber terminal 124a. However, the procedure may relate to the relationship between several different subscriber terminals 124 and hub stations 120 or base stations 112.

In accordance with the above description of the traditional methods of power control in a direct line of communication using feedback, in which the user terminals transmit in the hub or base station commands, such as commands strengthening/weakening, which prescribe specific capacity adjustment in the information channels of the straight line. These commands are usually transmitted through a return line in the command channel gain/attenuation. The advantage is shown in Fig. 4 logic power control is the elimination of the need for the above-mentioned channels.

At step 402, the base station 120a performs power adjustment depending on the noise. As shown in Fig. 4, step 402 includes the steps 408 and 410. At step 408 the hub station 120a principle is the magnetic measurement of the current values of the SNR in the control channel from the user terminal 124a. The hub station 120a transmits the control channel signals of constant power. Therefore, this accepted estimation of SNR serves as a criterion for determining power levels of the transmission information channels direct communication line. In accordance with the foregoing, the hub station 120a determines at step 410, the source power level, Pbaselineon this adopted value of SNR. The following is a description of the process of this definition with reference to Fig. 5.

At step 404, the base station 120a regulates the transmission power depending on the interference. Step 404 includes the steps 412 and 414. At step 412 the hub station 120a detects the sensitivity of the user terminal 124a to interfering signals transmitted to other user terminals 124. While these interfering transmitted signals are difficult to predict and can vary in power, the operating environment of the user terminal 124a defines the sensitivity of the user terminal 124a to interference. The following is a description of the process of this definition with reference to Fig. 6.

The sensitivity of the user terminal 124a to interference depends on the extent of possible changes in the levels of interference power. Based on this identified sensitivity to interference base station 120a determines appropriate then the advice is power, Pmarginat step 414.

At step 406 the hub station 120a performs power adjustment depending on the error rate. As can be seen from Fig. 4, step 406 includes the steps 416 and 418. At step 416 the hub station 120a detects the error rate in a straight line, for example the ratio of packet errors (PER). At step 418 the hub station 120a determines a correction power level, Pcorrectionon the detected error rate.

At step 420 the hub station 120a sends information channel for direct communication line to the terminal 124a signals with transmit power Ptransmitthat is in particular based on PbaselinePmarginand Pcorrectionfor example, in relation expressed by the following formula (2).

Ptransmit= Pbaseline+ Pmargin+ Pcorrection.(2)

As shown below, the coefficients of the error in the information channel of the straight line depends on the value of SNR in the channel.

Each of the values of PbaselinePmarginand Pcorrectiondefine the stages 402, 404 and 406, to meet assigned requirements coefficients errors, such as the ratio of bit errors (BER) and the ratio of packet errors (PER), in the information channel is a straight line. Requirements can be assigned as specified and in accordance with another variant, dynamically R is Galereya over time.

III. Power adjustment depending on the noise

In accordance with the description above with reference to Fig. 4, Pbaselineis determined by the hub station 120a at step 410. The hub station 120a regulates Pbaselineso, in the absence of interference from other source of RF energy, to ensure compliance with the requirements to the maximum coefficients of the error information transfer in a straight line. Pbaselinedepending on the values of the SNR, which is measured subscriber terminal 124a and characterizes the quality of the reception signals in the control channel is active beam.

As can be seen from Fig. 1, the hub station 120a communicates with the subscriber terminal 124a via satellite 116a. Satellite 116a provides a link within the service area, which contains a number of beams, for example beams 204. The hub station 120a transmits a set of signals on the control channels of direct communication line. Each of the data signals of the control channel is relayed by satellite 116a one corresponding beam of the multiple beams.

These signals control channels using time shifts this pseudo-random (PN) code sequence. In addition, the hub station 120a transmits data pilot signals essentially constant power.

Terminal 124a is served by one of the many beam the satellite 116a. In this description of such a beam is called the active beam user terminal 124a. User terminal measures the value of the SNR of the pilot signal in the active beam and transmits the results of the measurement junction station 120a. This transferred the measurement can be in the format of messages that are periodically transmitted subscriber terminal 124a in junction station 120a.

Because the signals of the control channels of direct communication line is transmitted with constant power, data measured SNR values passed to the subscriber terminal 124a, serve to anchor the station 120a criteria determine the appropriate transmit power levels on the information channel is a straight line.

Each measurement of the current values of the SNR in the control channel received from the subscriber terminal 124a, expressed in the present description with respect to Ecp/Ntwhere Ecpmean energy on the element of the pilot signal. In accordance with the foregoing base station 120a receives Ecp/Ntat step 408. Depending on the relationship Ecp/Ntthe hub station 120a determines the power level of Pbaseline. In the absence of interference signals on the information channel for direct communication line with a capacity of Pbaselinewill not go beyond the specified limits on the coefficients of the error, when receiving subscriber terminal 124a.

In Fig. 5 presents under the one sequence of operations of the step 410. The implementation of this stage begins with step 502, in which the hub station 120a calculates the shift of power level Poin the following formula (3)

Po= Ebt/Nt+ 10log(R/W) - Ecp/Nt. (3)

In equation (3) Ebt/Ntmeans the required SNR value in the information channel for direct communication line in decibels (dB), R is the information rate in the information channel for direct communication line, W is the width of the strip explode signal spectrum in the information channel for direct communication line, Ecp/Ntmeans adopted effective value of SNR in the control channel in dB, and R/W means the gain in the signal-to-noise ratio in the signal processing. Ebt/Ntappointed in order to provide the desired BER value for signals transmitted through an information channel for direct communication line to the terminal 124a.

Step 504 is followed by step 502. At step 504 the hub station 124a summarizes Powith the power level of signals on the control channel in a user terminal 124a. Then, at step 506, the base station 120a sets the Pbaselineat the level of the summing performed in the step 504.

The following are two examples perform these steps using equation (3). In both the examples, the desired SNR value (Ebt/Nt) in orationem channel of direct communication line is equal to 1 dB. In the first example, R = 6,048 kbit/s and W = 1,2288 MHz. If the hub station 120a receives from the user terminal 124a of the value of Ecp/Ntequal to -21 dB, then Poapproximately equal to -1 dB. Therefore, in this example, the hub station 120a sets the Pbaselineon the level by 1 dB lower than the corresponding transmission power of the control channel.

In the second example, R = 9.6 kbit/s and W = 1,2288 MHz. If the hub station 120a receives from the user terminal 124a of the value of Ecp/Ntequal to -21 dB, then Poapproximately equal to 1 dB. Therefore, in this example, the hub station 120a sets the Pbaselineon the level by 1 dB higher than the corresponding transmission power of the control channel. The two examples show that with the increase of information speeds also increases the difference between the transmission power of the pilot signal and the transmission power information signal.

IV. Regulation of power depending on the interference

In accordance with the description with reference to Fig. 3, which presents a scenario, the power of the transmitted signal 302 is greater than the transmitted signal 302'. In accordance with this, in the framework shown in Fig. scenario 3 when receiving a transmitted signal 306 subscriber terminal 124e sensitivity to noise is higher than the reception of the transmitted signal 304 subscriber t is renala 124d. The hub station 120a applies this principle to step 404 to mitigate interference data saving power transmission.

The signals that are transmitted over communication channels direct lines of communication with other user terminals 124 in different beams can interfere with the signals that are transmitted through an information channel in the subscriber terminal 124a. In accordance with the description above with reference to equations (1), the power levels of noise (denoted by It) may change considerably. Such changes lead to the fact that the values of SNR in the information channel for direct communication line, and the corresponding coefficients error vary within wide limits.

Below are the cause of these fluctuations with reference to equation (4). Equation (4) expresses the component, It,i, noise from interference that subscriber, i create the rulings of the signals transmitted on the information channels of direct line group interfering subscribers (indicated by the variable j)

In equation (4) Pjmeans transmit power in a direct line of communication with subscriber j, Rjmeans of information transmission speed in a straight line connection with the subscriber j, and W represents the width of the strip explode CDMA signal on the spectrum.

In accordance with equation (4) contribution creates POM is hee user terminal 124 due to the interference of the noise component in the direct line of communication with the subscriber terminal 124a is directly proportional to the speed information, Rjin a straight line from interfering subscriber terminal. In accordance with the expression (1) with the increase in information speed in a straight line, due to interference noise component, Itthe noise energy Ntgradually becomes dominant over the corresponding component of N0thermal noise.

In accordance with the description above with reference to Fig. 1 WCS 100 may provide both the LDR service and HDR service. Because the LDR services differ considerably lower information rate, changes in noise due to interference from communication lines LDR services is small in comparison with changes in noise due to interference from communication lines HDR-Ulug by which information is transmitted pulses with higher information rates.

To the changes of the interference is not prejudicial to the connection on the radio or in between, the hub station 120a applies Pmarginas a component of the transmission power information channel for direct communication line. Pmarginreduces interference from information channels straight line adjacent beam.

In accordance with the above description with reference to Fig. 3, which presents a scenario, the location of user terminal 124 within the beam affects the sensitivity of this terminal to interference. In particular, Abona is TSCI terminal 124, situated near the border between the two beams, for example, user terminal 124 in the zone 208 intersection should obviously take more interference than user terminal 124 further away from the border between the rays, for example, user terminal 124 located in the Central area 206. Therefore, the value of Pmarginapplied nodal station 120a to mitigate the effect of interference may be less if the terminal 124a is located in the Central area than in the case where the user terminal 124a is in the zone of intersection.

In accordance with the foregoing base station 120a determines Pmargindepending on the location of the user terminal 124a within its active beam 204. As follows from the above description with reference to Fig. 4, Pmarginis determined by the hub station 120 at step 414. In accordance with the foregoing step 414 may include stages, namely, that Pmarginset at a first power level, if the identified location is within the area of intersection of the rays, and Pmarginset at a second power level, if the detected location is in the Central zone of the beam. Because user terminals 124, located in the zones of intersection of the rays is more sensitive to interference, then the first power level in this example above Vtorov the power level. In Fig. 6 presents a flowchart showing the sequence of operations of the step 412 where you implement this feature based on location. The implementation of this stage begins with step 602, in which the hub station 120a receives from the user terminal 124a set of measurements of signal power. Each of these power measurements corresponds to one of the many rays. These measurements can be formatted messages, such as messages of measuring the power of the pilot signal (PSMM).

Next, at step 604, the hub station 120a calculates the difference between the first measurement signal and each of the other measurements of signal power. This first measurement of power may be the power of the pilot signal in the active beam or the maximum measurement capacity. In this case the smallest of these differences means receiving subscriber terminal 124a of such signals transmitted in a straight line, as interfering signals on communication channels direct communication line to the other beam. In accordance with the foregoing the least of these differences indicates the sensitivity to interference at the user terminal 124a.

At step 606 the hub station determines whether the least of the differences computed in step 604, the specified threshold. what if exceeds, then at step 608, at which the hub station 120a concludes that the subscriber terminal 124a has a first sensitivity to interference. Otherwise, at step 610, at which the hub station 120a concludes that the subscriber terminal 124a has a second sensitivity to interference, which is higher than the first sensitivity to noise.

Based on this identified sensitivity to interference base station 120a determines the appropriate value of Pmarginin accordance with step 414, described above with reference to Fig. 4. In particular, the hub station 120a determines Pmarginof dependence, which implies an increase of the Pmarginas you increase the sensitivity to interference detected at step 412.

For example, as described above with reference to Fig. 6, the hub station 120a defines the sensitivity of the user terminal 124a to interference. Namely, the hub station 120a detects a higher sensitivity to noise at stage 608, than at step 610. Therefore, the hub station 120a sets the Pmarginon the level, in which case, when step 414 is followed by step 608, higher than in the case when step 414 is followed by step 610.

V. power Adjustment depending on the error rate

In accordance with the above description with reference to Fig. 5 and Fig. 6, Pbaselineand Pmargn determined depending on the values of SNR and power measurements. For example, the hub station 120a determines Pbaselineat step 410, depending on the measurements of the current values of the SNR in the control channel, to achieve the desired SNR value (indicated by the relation Ebt/Ntin equation (3)) in the information channel is a straight line. This required SNR value matches the specified coefficients of the error in the framework of dependence, which is determined based on the modulation scheme and coding techniques error correction used by the host station 120a for transmitting signals on the information channel is a straight line.

Similarly, at step 414 the hub station 120a determines Pmargindepending on the comparison result of measuring the power of the pilot signal, which is taken from the user terminal 124a and which reveals the sensitivity to interference. However, this identified interference susceptibility does not indicate the actual interference, the received subscriber terminal 124a.

In contrast to Pbaselineand PmarginPcorrectionis determined by the hub station 120a at step 418, depending on the actual coefficients of the error in a straight line, counted in the subscriber terminal 124a. In accordance with the above description with reference to Fig. 4, the hub station 120a in what is the error rate for example, the value PER in a straight line, at step 416.

The hub station 120a transmits the information on the information channel for direct communication line to the terminal 124a in the form of packets. Each data packet is marked with an identifying number sequence ID sequence), which is assigned to the specified method. Terminal 124a controls the ID sequence of the received packet and transmits the message to the hub station 124a, when the packets are received with violation of the order.

This message, called in the present description the message to the lack of acknowledgment (NAK), indicates the ID of the sequence, which was absent in the set of packages that the user terminal 124a received from the hub station 120a. No ID sequence indicates a packet error. The hub station 120a collects statistical data on the number of NAK messages received from the subscriber terminal 124a, to calculate the value PER information channel direct line of communication at step 416.

In accordance with the foregoing step 416 includes a step consisting in that the hub station 120a counts the number of messages to the lack of acknowledgment (NAK), adopted in the data collection period. In addition, step 416 includes a step consisting in that the hub station 120a calculates EIT is the group of PER in accordance with such dependence, which, for example, the following equation (5)

In accordance with equation (5) hub station 120a divides the number of NAK messages received in the data collection period, the number of packets that a node station 120a conveyed in the data collection period.

Another method of calculating the PER is that the user terminal 124a receives the packets containing control bits cyclic redundancy code (CRC). Terminal 124a applies in each package mentioned bits of the CRC to determine whether the packet bit errors. If it does, then the user terminal 124a increases the counter value of the packet error. Terminal 124a may determine the value PER the calculation of the ratio calculated packet error to the accepted error. This terminal may periodically transmit these calculated values in PER nodal station 120a. In addition, it is possible to use other known methods of calculating the value of the PER in the framework of embodiments of the present invention without going beyond the scope of the invention.

In accordance with the above description with reference to Fig. 4, the hub station 120a determines at step 418 the amendment power level, Pcorrectionon the detected error rate. Step 418 includes the stages consisting in the fact that the value PER found on atape, compared with the specified value and PER respectively regulate Pcorrection. In particular, this adjustment is that the hub station 120a increases Pcorrectionif the detected value PER greater than the specified value and PER nodal station 120a reduces Pcorrectionif the detected value of the PER is less than the specified values PER parameter.

VI. The distribution of time intervals

As can be seen from Fig. 4, steps 402, 404 and 406 can be performed sequentially. However, these steps can also be performed independently from each other. In accordance with the foregoing, each of the stages 402, 404 and 406 may include the step consisting in receiving information from the user terminal 124a. Based on this information each of these stages involves the installation of the respective components of the power transfer.

In accordance with the above power control depending on the noise is performed at step 402. This power control is that the hub station 120a receives the measurement values of the SNR, for example, Ecp/Ntfrom the subscriber terminal 124a and depending on them sets Pbaseline. Terminal 124a may periodically transmit data measurements of SNR, for example, once per second. Therefore, the hub station 120a may periodically establish Pbaseline.

Regulus is of the power depending on the interference is performed at step 404. Change the sensitivity to interferences often occur more slowly than changes in the noise environment from the user terminal, because associated with noise changes due to slower changes in geometry caused by the satellite motion and/or movement of the subscriber terminal. Therefore, step 404 may be that the hub station 120a receives a sequence of messages of measuring the power of the pilot signal (PSMM), which are also sent periodically, for example, with a period of 10 seconds. Therefore, the hub station 120a may periodically establish Pmargin.

The hub station 120a performs power adjustment depending on the error rate, step 406. In accordance with the foregoing, the power regulation are that is received NAK messages in the data collection period. Specified period of data collection can have a different duration depending on the anticipated requirements. More reliable statistics on PER're going, when used over long periods of data collection. Therefore, the hub station 120a may be periodically adjusted Pcorrectionwith data collection period. Typical data collection period is 60 seconds.

VII. An example implementation of a junction

In Fig. 7 shows a block diagram of a variant is sushestvennee typical junction 120, which implements the methods proposed in the present description. Although the description of the typical variant of the implementation is given in relation to the satellite communication system of this alternative implementation can be applied to a cellular base station, for example, the base station 112 shown in Fig. 112. As can be seen from Fig. 7, this version of implementation contains the antenna section 702, which is connected to a radio frequency (RF) subsystem 704, and the CDMA subsystem 706, which is connected to the RF subsystem 704. In addition, the hub station 120 further comprises a switch 708, which is associated with the CDMA subsystem 706.

The antenna section 702 includes at least one antenna, which exchanges signals with at least one terminal 124 via satellite(s) 116. In particular, the antenna section 702 receives RF signals through a return line connection, and transmits the RF signals in a straight line. To enable transmission and reception of RF signals only antenna, the antenna section 702 may also include a diplexer (not shown).

RF subsystem 704 receives electrical signals from the antenna section 702 in the range of RF. After receiving the RF subsystem 704 converts the received signals with decreasing frequency range RF to intermediate frequency range (FC). In addition, the RF subsystem 704 may filter the electrical signals, Postup the possibility of the antenna section 702, in accordance with a given bandwidth.

To increase the power of RF signals received from antenna section 702, the subsystem also contains RF amplifier nodes (not shown). Typical amplification nodes contain a low noise amplifier (LNA), which pre-amplifies the signals from the antenna section 702, and an amplifier with adjustable gain (VGA), which enhances the data signals after lowering their frequency to the inverter in the above-mentioned conversion.

As a result of these operations, filtering, frequency conversion and amplification, the RF subsystem 704 generates the RF signal 720, which is passed to the transceiver 712 return line, being part of the CDMA subsystem 706.

In addition to receiving signals from the RF return line from the antenna section 702, RF subsystem 704 receives the if signal 722 straight line connection from the transceiver 710 a straight line, part of the CDMA subsystem 706. RF subsystem 704 amplifies and converts with the higher frequency of this signal into a corresponding RF signal for transmission by the antenna section 702.

As can be seen from Fig. 7, CDMA subsystem 706 contains the transceiver 710 straight line communication transceiver 712 a straight line, the router 714, and subsystem 716 contact field finder (SBS). In accordance with the foregoing, the reception of the transmitter 710 and 712 are exchanged between the if signals 720 and 722 with RF subsystem 704. In addition, the transceivers 710 and 712 perform CDMA.

In particular, the transceiver 710 straight line receives at least one information sequence 724 straight line connection from the router 714. After receiving transceiver 710 straight line converts the data sequence in the FC signal 722, which has the format of CDMA transmission. Below is a detailed description of the specified conversion with reference to Fig. 8.

The transceiver 712 return line converts the if signal 720, which has a CDMA transmission, the information sequence 726a - 726n. For example, the transceiver 710 straight line compresses and spreads the frequency of the if signal 720 with at least one pseudo-random (PN) code sequence and codes of distribution channels. In addition, the transceiver 710 direct line of communication can perform the decoding operation and the operation that is the inverse interleaving to form an information sequence 726, which are transmitted to the router 714.

Router 714 provides transmission information sequences 724 and 726, which may be in packet format between SBS 716 and transceivers 710 and 712. This transfer is carried out via the interface 728, which may be a data network, for example, the local CE is o (LAN) or any other widely known technical means of information transfer.

SBS 716 processes the traffic straight line and a return line, which is operated by the hub station 120. This traffic includes both payload and signaling traffic. For example SBS 716 exchanges signaling traffic in the process, call processing, for example, a call gap call and switching between beams. In addition, SBS 716 forwards the traffic to the switch 708, which serves as the interface to the switched public telephone networks (PSTN).

SBS 716 contains a set of selectors 718a-n to process forward and reverse traffic lines. Each selector supports active processes of information exchange of the corresponding user terminal 124. However, the selectors 718 can be reallocated to other subscriber terminals 124 after data active information exchange processes. For example, the selector 718 evaluates the PSMM, the measured SNR values of pilot signals and NAK messages sent from the user terminals 124 to perform appropriate adjustment of the transmission power information channel for direct communication lines.

Each selector 718 may be implemented in software-controlled processor, programmed to perform the functions described here. These options for implementation may contain well-known mill is Artie elements or generic function or universal hardware including a variety of digital signal processors (DSP), programmable electronic devices or computers, which operate under control of programmable commands to perform the required functions.

Each selector 718 controls the power control in a straight line. To adjust the transmit power in a straight line, each selector 718 730 transmits the command to the power control in a transceiver 710 a straight line. Each team 730 power control determines the transmit power in a straight line. In response to these commands, the transceiver 710 a straight line sets the transmission power for direct lines of communication controlled by the selectors 718 issuing these commands.

For example, the selector 718a generates a command 730a power control, which is sent to the transceiver 710 via the interface 728 and the router 714. After receiving the command 730a power control, the transceiver 710 straight line connects the power in a straight line, controlled by the selector 718a. Below this possibility is discussed in more detail with reference to Fig. 8.

In accordance with the foregoing, each selector 718 operates in conjunction with the transceiver 710 direct communication line to perform the steps discussed above with reference to Fig. 4-6. N the example, in accordance with the above description of the steps 402, 404 and 406, each selector 718 determines PbaselinePmarginand Pcorrection.

In addition, each selector 718 operates in conjunction with the transceiver 710 direct line of communication to establish the appropriate value of PtransmitPbaselinePmarginand Pcorrection. Consequently, these components perform step 420.

In Fig. 8 shows a block diagram of a variant of implementation of transceiver 710 in a straight line. As can be seen from Fig. 8, the transceiver 710 contains a group of tracts 802a-802n transceiver, the adder 804 and interface 805 output. Each tract 802 transceiver receives an information sequence 724 direct lines of communication and command 730 power control from the corresponding selector 718. Although in Fig. 8 shows the elements of the implementation only for tract 802a transceiver, paths 802b-802n transceiver may contain similar or identical assets.

As can be seen from Fig. 8, tract 802a transceiver contains a module 806 interleaving, the encoder module 808 and 810 gain control. Module 806 interleaving takes the information sequence 724 and performs interleaving blocks of the sequence to form alternating sequence 820.

Premia is connected sequence 820 is sent to the encoder 808, which performs encoding with error correction, for example, block turbomotive to form the encoded information sequence 822.

Module 810 gain control receives the encoded sequence 822, which represents an information sequence straight line. In addition, the module 810 gain control receives the command 730a adjust the power from the selector 718a. Module 810 gain control changes the scale of the coded sequence 822 depending on the power level assigned to a team 730a adjust the power. Thus, the module 810 gain control can increase or decrease the capacity of the coded sequence 822. This change of scale generates the scaled sequence 824. Encoded sequence 822 is a sequence of numeric characters. This sequence can be scaled by multiplying each symbol by a gain determined by the command 730 adjust the power. These operations change the scale can be realized using digital methods in hardware and/or programmable instructions executed well-known elements, or generic function, or a universal equipment, including various programmable who elektronnye devices or computers, running commands, firmware or programmable commands to perform the required functions. Examples include software-controlled processor, controller, or device, the microprocessor, at least one signal processor (DSP), specialized modules of functional circuits, application-specific integrated circuits (ASIC) and programmable gate arrays (FPGA). In accordance with the above command 730a capacity adjustment may contain at least one programmable command transmitted from the selector 718a module 810 gain control.

As can be seen from Fig. 8, tract 802 transceiver further comprises expanding range of mixers 812a - 812b forming channels mixers 814a - 814b and the quadrature phase arm (QPSK-modulator) 816. Each expansion range of the mixer 812a - 812b receives the scaled sequence 824 and blends (e.g., multiplication) this sequence with the corresponding pseudo-random (PN) code sequence 834 to form a sequence 828a and 828b exploded range.

Each of the sequences 828a and 828b exploded spectrum transmitted to the respective forming channels mixer 814. Each forming channels mixer 814 mixes (e.g., multiplying) the ACC is stuudy sequence 828 exploded range with a channel code, for example, a Walsh code. As a result, each mixer 814 generates a multi-channel sequence 830. In particular, the mixer 814a generates in-phase (I) multi-sequence 830a and mixer 814b generates quadrature (Q) multi-sequence 830b.

Multi-channel funnels 830a and 830b are transmitted in QPSK-modulator 816. QPSK-modulator 816 modulates the data sequence to form a modulated signal 832a. The modulated signal 832a is passed to the adder 804. The adder 804 sums the modulated signal 832a with signals 832b - 832n, issued paths 802b - 802n. The result of this operation is generated combined signal 834, which is forwarded to the interface 805 output.

Interface 805 output converts the combined signal 834 with increasing height of the bandwidth of the modulating signals to the inverter and thereby generates the if signal 722 straight line. Interface 805 output can optionally perform the filtering and amplification in the process of forming the if signal 722.

VIII. Conclusion

The above description of various specific embodiments of the invention, however, it should be understood that these examples are presented for example only and do not limit the invention. For example, the present invention is not limited to satellite systems tie is, but it can also be used in the composition of such terrestrial systems, which are characterized by the presence of several sectors (rays) and zones of intersection of these sectors. In addition, the present invention is not limited to CDMA systems and can be applied to communication systems and radio channel joints of other types, for example, on system TDMA, FDMA, CDMA 2000 and WCDMA. In addition, although the description of embodiments of the invention considered broadcast CDMA quadrature phase shift keying, you can also use other modulation techniques.

Specialists in this field of technology is the obvious possibility of making various changes regarding the form and particulars, within the essence and scope of the present invention defined by the claims.

1. Method of adjusting transmit power, Ptransmitaccording to the information channel for direct communication line to the terminal in the communication system with multiple beams, the method includes the following steps:

(a) from the subscriber terminal to receive the current signal-to-noise ratio (SNR) in the control channel;

(b) determine the initial power level, Pbaseline, according to the current SNR value in the control channel;

(c) identify the sensitivity of the user terminal to interference;

(d) determine then the advice is power, Pmarginon the identified sensitivity to interference.

(e) identify the ratio of packet errors (PER) for the subscriber terminal;

(f) determine a correction power level, Pcorrectionon the identified value PER; and

(g) set Ptransmit, PbaselinePmarginand Pcorrection.

2. The method according to claim 1, in which step (b) includes the steps consisting in the fact that

(1) calculate the shift of power level Poaccording to the formula Pabout=Ebt/Nt+10log(R/W) - Ecp/Ntwhere Ebt/Ntmeans the required SNR value in the information channel for direct communication line in decibels (dB), R is the information rate in the information channel for direct communication line, W is the width of the strip explode signal on a spectrum, and Ecp/Ntmeans adopted effective value of SNR in the control channel in dB; and

(2) summarize the Powith the level of transmission power in the control channel.

3. The method according to claim 1, in which step (C) includes the steps consisting in the fact that

(1) from the user terminal take a set of measurements of signal power, in which each measurement signal corresponds to one of the multiple beams; and

(2) calculate the difference between the first measurement signal and each of the other measurements of signal power.

4. the procedure according to claim 3, in which step (1) includes a step consisting in the fact that they are taking the message of measuring the power of the pilot signal (PSMM).

5. The method according to claim 3, in which step (d) includes the steps consisting in the fact that

(1) set Pmarginon the first power level if the lower of the calculated differences is greater than the specified threshold; and

(2) set the Pmarginat the second power level if the lower of the calculated differences is less than or equal to a specified threshold;

the first power level lower than the second power level.

6. The method according to claim 3, in which step (d) includes a step consisting in the fact that Pmarginset depending on the smallest of the calculated differences.

7. The method according to claim 1, in which step (C) includes a step consisting in the fact that identify the location of the user terminal within one of the many rays.

8. The method according to claim 7, in which step (d) includes the steps consisting in the fact that

(1) set Pmarginon the first power level, if the detected location is within the area of intersection of the rays; and

(2) set the Pmarginat the second power level, if the detected location is in the Central zone of the beam;

the first power level is higher than the second power level.

9. The method according to claim 1, in which the WMD step (e) includes the steps namely, that

(1) determine the number of messages to the lack of acknowledgment (NAK), adopted in the data collection period;

(2) determine the number of packets transmitted in the subscriber terminal in the data collection period; and

(3) calculate the ratio of packet errors detected number of NAK messages and found the number of packets sent.

10. The method according to claim 1, in which step (e) includes the steps consisting in the fact that

(1) control cyclic redundancy code determines whether the packet bit errors;

(2) increasing the counter value of the packet error, if determines that the packet contains errors; and

(3) calculate the ratio of the calculated packet error to the accepted error.

11. The method according to claim 1, in which step (g) includes a step consisting in the fact that the set Ptransmiton the power level, which is essentially equal to the sum of PbaselinePmarginand Rcorrection.

12. The method according to claim 1, in which step (f) includes the steps consisting in the fact that

(1) increase Pcorrectionif the detected value PER greater than the specified value PER; and

(2) reduce Pcorrectionif the detected value of the PER is less than the specified values PER parameter.

13. Control system power transmission, Ptransmitinformation channel direct line of communication and onatski terminal in the communication system with multiple beams, the system contains

the selector used to determine the initial power level, Pbaseline, according to the current SNR value in the control channel, the threshold power value, Pmarginon the identified sensitivity to interference, and the amendment power level, Pcorrectionon the identified rate of packet errors (PER); and

the transceiver is designed to set the transmission power information channel for direct communication line, Ptransmit, PbaselinePmarginand Pcorrection.

14. The system of item 13, in which the transceiver is also designed to set the Ptransmiton the power level, which is essentially equal to the sum of Pbaseline, Rmarginand Rcorrection.

15. Control system power transmission, Ptransmitaccording to the information channel for direct communication line to the terminal in the communication system with multiple beams, the system contains

means receiving from the user terminal of the current relationship of signal to noise ratio (SNR) in the control channel;

the means of determining the source power level, Pbaseline, according to the current SNR value in the control channel;

the means of detection sensitivity of the subscriber terminal to interference;

the means of determining the threshold powerfully the tee, Pmarginon the identified sensitivity to interference.

a means of detecting the ratio of packet errors (PER) for the subscriber terminal;

the means for determining an adjustment to a power level of Pcorreciion, by value, PER; and

the installation tool Ptransmit, PbaselinePmarginand Pcorrection.

16. The system of clause 15, in which the means for determining the initial power level contains

the means of calculating the shift of power level Paboutaccording to the formula Rabout=Ebt/Nt+10log(R/W) - Ecp/Ntwhere Ebt/Ntmeans the required SNR value in the information channel for direct communication line in decibels (dB), R is the information rate in the information channel for direct communication line, W is the width of the strip explode signal on a spectrum, and Ecf/N means adopted effective value of SNR in the control channel in dB; and

means summation Paboutwith the level of transmission power in the control channel.

17. The system of clause 15, in which the means of detection sensitivity of the subscriber terminal to interference contains

means receiving from the subscriber terminal set of measurements of signal power, in which each measurement signal corresponds to one of the multiple beams; and

the means of calculating the difference between the first because of the ' signal power and every other measure of signal power.

18. System 17, in which the tool receiving from the subscriber terminal set of measurements of signal power includes a tool receiving messages measuring the power of the pilot signal (PSMM).

19. System 17, in which the means of determining Pmargincontains

the installation tool Pmarginon the first power level if the lower of the calculated differences is greater than the specified threshold; and

the installation tool Pmarginat the second power level if the lower of the calculated difference is below or equal to a threshold; and

the first power level lower than the second power level.

20. System 17, in which the means of determining Pmargincontains the installation tool Pmargindepending on the smallest of the calculated differences.

21. The system of clause 15, in which the means of detection sensitivity of the subscriber terminal to interference includes means for determining the location of a subscriber terminal within one of the many rays.

22. The system according to item 21, in which the means of determining Pmargincontains the installation tool Pmarginon the first power level, if the detected location is within the area of intersection of the rays; and

the installation tool Pmarginat the second power level, if the detected location is in the Central zones of the beam;

the first power level is higher than the second power level.

23. The system of clause 15, in which the said means of detection values PER contains

the means for determining the number of messages to the lack of acknowledgment (NAK), adopted in the data collection period;

the means for determining the number of packets transmitted in the subscriber terminal in the data collection period; and

the means of calculation of the coefficient of packet errors detected number of NAK messages and found the number of packets sent.

24. The system of clause 15, in which the installation tool Ptransmitincludes a tool to set the transmit power in the information channel for direct communication line to the power level, which is essentially equal to the sum of PbaselinePmarginand Pcorrection.

25. The system of clause 15, in which the means of determining Pcorrectioncontains

a means of increasing Pcorrectionif the detected value PER greater than the specified value PER; and

a means of reducing the Pcorrectionif the detected value of the PER is less than the specified values PER parameter.

26. The system of clause 15, in which the means of detecting the ratio of packet errors (PER) contains

(1) a measure of control cyclic redundancy code, does the packet bit errors;

(2) a means of increasing the value of the counters is ka batch errors if you determine that the packet contains errors; and

(3) a means of calculating the ratio calculated packet error to the accepted error.



 

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5 cl, 6 dwg

FIELD: radio engineering, possible use in high speed radio communication systems which use impulse ultra-broadband signals.

SUBSTANCE: communication system contains receipt/transmission switch, band filter, antenna, processing and control block, buffer devices, generator of ultra-broadband impulses, low noise amplifier, attenuator, power divider, two temporary window devices, two threshold devices, two threshold voltage generators, synchronization block, two narrowband filters, narrowband filter switch, synthesizer of harmonic signal and amplifier of harmonic signal.

EFFECT: reduced time needed to find a client and time of communication lock of system.

2 dwg

FIELD: communications engineering, possible use for compensating non-linear distortions in wireless communication devices.

SUBSTANCE: in accordance to the invention, wireless communication device contains direct transformation receiver with frequency reduction and distortion suppression device for suppressing non-linear second order distortions in receiver, where suppression device has squaring device for receiving radio-frequency signal being received, injected into input of mixer in receiver, and generating square version of received radio frequency signal, amplification cascade, meant for receiving square version of received radio frequency signal, where output signal of amplification cascade has amplitude, corresponding to second order non-linearity characteristic of aforementioned receiver, and output communication device for sending output signal from amplification cascade to output of aforementioned receiver for generation of signal, transformed with reduced frequency and belonging to band of modulating signal frequencies, characterized by suppressed non-linear distortions of second order.

EFFECT: reduction of non-linear second order distortions, resulting from interference sources and occurring in direct transformation receiver with frequency reduction.

4 cl, 6 dwg

FIELD: electronics.

SUBSTANCE: the circuit generates interfacing signal between first and second integration circuits. Circuit contains supporting signal circuit (622), which outputs supporting signal, interfacing circuit (600) and analog signal transmission circuit (626). Interfacing circuit is realized on first integration circuit (600), during operation it connects to supporting signal circuit (622), receives supporting signal and input data signal and generates interfacing signal. Analog signal transmission circuit (626) is realized on second integration circuit, during operation it connects to control circuit (614), receives interfacing signal and outputs output signal. Supporting signal may represent a voltage or current signal and may be generated on first or second integration circuit. Interfacing circuit may be realized containing current mirror, connected to an array of switches, and may operate in re-digitization mode to simplify filtration requirements. Interfacing signal may represent a differential current signal, having resolution of several (for example, four, eight or more) bits. Analog signal transmission circuit (626) may represent, for example, distributed amplification amplifier, modulator or a different circuit.

EFFECT: improved interfacing between integration circuits with usage of lesser amount of signal lines, generating increased noise.

9 cl, 6 dwg

FIELD: radio-navigation, possible use in signal receivers of satellite radio-navigation systems used to determine client location and current time from signals of GLONASS, GPS, and similar radio-navigation systems.

SUBSTANCE: in the method satellite signals included in search list are found, until number of detected signals, which is sufficient for navigation measurements, is produced. In first positions of the search list three satellites are included in arbitrary order which ensure maximal coverage of Earth surface. Further satellites are included into search list in order which is determined by maximal sum of average distances between each one of them and all satellites positioned in the list closer to the beginning. The search for signals of each checked satellite is performed simultaneously using all free channels of receiver with distribution of search range between the channels. Satellite signal search is performed serially based on aforementioned list, starting from first one in the list, until first detection of signal. The search for signals of further satellites remaining in aforementioned list is performed in order determined by maximal difference between the sum of average distances between the satellite selected for check and all earlier checked satellites with undetected signals and the sum of average distances between that satellite and all earlier checked satellites with detected signals.

EFFECT: creation of method for blind finding of signals in multi-channel receiver of satellite radio-navigation signals, ensuring reduction of average search time required to solve navigational problem of the number of satellite radio-navigation system signals.

2 cl, 3 dwg

FIELD: satellite systems.

SUBSTANCE: system and method are claimed for detecting errors of temporal displacement in a satellite system, on basis of Doppler displacement and speed of Doppler displacement alteration. In accordance to the invention, user terminal determines first and second time displacements, respectively related to first and second satellite beams from respectively first and second satellites. Further, user terminal determines Doppler displacement and speed of Doppler displacement alteration, related to first and second satellite beams. Temporal displacement is estimated on basis of measured Doppler displacement and speed of Doppler displacement alteration and then compared to time displacement, determined by the user terminal. If the result of comparison does not match a specific threshold, beam identification error is stated.

EFFECT: ensured identification of satellite beams.

6 cl, 12 dwg, 1 tbl

FIELD: system for two-sided wireless communications, in particular, system for two-sided wireless communications, which provides capability for direct communication between terminals and mediated communication between terminals through the other terminal.

SUBSTANCE: wireless communication system contains portable communication devices, capable of setting up direct communication between terminals and mediated communication between terminals through another terminal, without using a stationary base station. Portable communication device, used as a terminal, has capability for functioning as a router for other communication devices in system when maintaining a separate direct connection to another portable communication device. After registration, registered device begins communication process by finding other devices.

EFFECT: increased efficiency.

3 cl, 22 dwg

FIELD: wireless communications, possible use for realizing communications with systems of both satellite and ground communications.

SUBSTANCE: multi-mode receiver-transmitter for wireless communication device contains first transmission channel for generation of first radio frequency transmission signal, compatible with first communication system, first receiving channel for receiving first radio frequency receipt signal from first communication system, second receipt channel for receiving second radio frequency receipt signal from satellite positioning system and used for determining position of wireless communication device, where aforementioned first and second receipt channels jointly use common receiving route.

EFFECT: combined capacity for ground and/or satellite communication in mobile receiver-transmitter with possible position detection and minimized power consumption.

5 cl, 9 dwg

FIELD: space engineering; operation of spacecraft flying in orbit of artificial earth satellite, but for geostationary orbit, which are stabilized by rotation along vertical axis, as well as ground reception points.

SUBSTANCE: system used for realization of this method includes emergency object transmitter, onboard equipment of spacecraft and ground equipment of reception point. Onboard equipment of spacecraft includes horizon sensor, receiving antenna, comparison unit, receiver, Doppler frequency meter, blocking oscillator, two AND gates, two rectifiers, pulse generator, pulse counter, switching circuit, magnetic memory, transmitter, transmitting antenna, modulating code shaper, RF generator and power amplifier. Ground equipment of reception point includes receiving antenna, RF amplifier, two mixers, standard frequency unit, phase doubler, three narrow-band filters, phase scale-of-two circuit, phase detector, Doppler frequency meter, computer and recording unit. Proposed method consists in search of such space position of space object by receiving antenna when Doppler frequency of received signal is equal to zero. Measurement at this moment of angle between mechanical axle of receiving antenna and horizon axis is carried out referring to onboard receiving unit.

EFFECT: extended functional capabilities; enhanced accuracy of determination of spacecraft orbit elements; reduction of time required for search of emergency object.

5 dwg

FIELD: controlling power consumed by space grouping of satellites as they pass shadow sections of orbits.

SUBSTANCE: proposed method includes evaluation of power consumed by each of airborne retransmitters installed on satellites, as well as disconnection of airborne retransmitters as soon as satellites enter shadow sections of orbits and their reconnection upon exit therefrom. In addition, time taken by each satellite to pass mentioned section, power consumed by each retransmitter, and total power consumed by retransmitters of each satellite at given section are evaluated before each satellite enters respective shadow section of orbit. Balance between power accumulated in each satellite and power consumed in shadow section of orbit is found. Satellites having time-intersecting shadow sections are grouped with those having positive and negative balance of power consumption as well as with satellites whose input power is balanced. Alternate satellites residing on illuminated sections of orbits are determined for negative-balance subgroup. Operating retransmitters are switched over to alternate satellites before each satellite subgroup starts passing shadow section to provide for balancing or positive balance of input power. In case of negative input power balance, power that can be borrowed from alternate satellites is evaluated and mentioned retransmitters are connected to them. Then alternate satellites are found in positive-balance satellite subgroup using above-described method.

EFFECT: enhanced reliability of communications.

1 cl, 3 dwg

FIELD: radio navigation aids, applicable in digital correlators of receivers of satellite radio navigation system (SPNS) signals, in particular, in digital correlators of receivers of the SPNS GLONASS (Russia) and GPS (USA) signals.

SUBSTANCE: the legitimate signal in the digital correlator is detected by the hardware, which makes it possible to relieve the load of the processor and use its released resources for solution of additional problems. The digital correlator has a commutator of the SPNS signals, processor, digital mixers, digital controllable carrier-frequency oscillator, units of digital demodulators, accumulating units, programmed delay line, control register, digital controllable code generator, reference code generator and a signal detector. The signal detector is made in the form of a square-law detector realizing the algorithm of computation of five points of the Fourier sixteen point discrete transformation with additional zeroes in the interval of one period of the, c/a code with a subsequent computation of the modules of the transformation results and their incoherent summation and comparison with a variable threshold, whose value is set up depending on the noise power and the number of the incoherent readout. The signal detector has a controller, multiplexer, complex mixer, coherent summation unit, module computation unit, incoherent summation unit, noise power estimation unit, signal presence estimation unit and a unit for determination of the frequency-time coordinates of the global maximum.

EFFECT: provided acceleration of the search and detection of signals.

2 cl, 6 dwg

FIELD: engineering of radio-systems for exchanging data, possible use for interference-protected information exchange between mobile airborne objects and ground complexes in "air to air" and "air to ground" channels.

SUBSTANCE: in accordance to the invention, in the device at transmitting side antenna polar pattern is induced onto polar pattern of receiving side antenna, relaying route is selected, current position and parameters of all airborne objects is determined for current time moment, extrapolation location points are computed for corresponding airborne objects during communication session being planned, mutual targeting of polar patterns of antennas of ground complex and the first (in the order of service) airborne object, second airborne object, etc., is performed, the objects being tracked during movement, data exchange is performed between corresponding objects of the system. After receipt confirmation is received, the procedure is repeated for second airborne object, etc. In ground complex and airborne objects picked for retransmission, operations of mutual targeting of polar pattern centers of UHF range antennas to appropriate objects and operations of tracking them during movement are performed.

EFFECT: increased interference protection and speed of transfer.

1 dwg

FIELD: communication systems, possible use for radio relaying of radio-television signals.

SUBSTANCE: in the method for aiming transmitting antenna of repeater at client station, which method includes aiming of receiving antenna of repeater at signal source by its rotation on basis of azimuth and elevation angle until signal capture, and then precise aiming of receiving antenna with usage of program aiming with correction by the signal being received, and also transmitting antenna of repeater is aimed at client station using calculated azimuth and elevation angle, before aiming of receiving antenna at signal source the antenna is turned along azimuth for an angle up to one hundred eighty degrees and for no less than three different azimuth angles, values of repeater error are measured relatively to horizon plane using angle sensor installed on the azimuth axis of receiving antenna. After that receiving antenna is turned along azimuth until signal capture, during that simultaneously in accordance with found parameters elevation angle of receiving antenna is changed, then in the mode of precise aiming of receiving antenna at signal source azimuth is successively increased and decreased by equal angles, both signal values read in these positions are used for more precise detection of signal source position azimuth. Then receiving antenna is turned along azimuth for angle corresponding to client station angle, and then receiving antenna is turned along azimuth for one hundred eighty degrees, in both positions repeater error relatively to horizon plane is measured by means of angle sensor. After that transmitting antenna is aimed at client station using computed azimuth and elevation angle, during azimuth aiming, precise position of signal source is used, and during elevation aiming, precise value of repeater error relatively to horizon plane is used.

EFFECT: increased precision of aiming of transmitting antenna of repeater, prevented usage of additional equipment for aiming the transmitting antenna, simplified operation.

4 dwg

Satellite relay // 2306671

FIELD: radio engineering, possible use for relaying signals in satellite communication systems with multi-access.

SUBSTANCE: relay contains N receiving channels, each one of which includes a receiving antenna, input amplifier, matching device, detector, threshold device, and also common blocks: activity analysis block, commutator, transmitter and transmitting antenna.

EFFECT: increased efficiency of usage of throughput of P-ALOHA protocol due to realization of servicing discipline, making it possible to block packets received via other beams when mono-channel is busy.

7 dwg, 1 ann

FIELD: communications engineering.

SUBSTANCE: proposed system has user terminal, gateway, and plurality of beam sources radiating plurality of beams, communication line between user terminal and gateway being set for one or more beams. Proposed method is based on protocol of message exchange between gateway and user. Depending on messages sent from user to gateway, preferably on pre-chosen periodic basis, gateway determines most suited beam or beams to be transferred to user. Messages sent from user to gateway incorporate values which are, essentially, beam intensities measured at user's. Gateway uses beam intensities measured at user's to choose those of them suited to given user. Beams to be used are those capable of reducing rate of call failure and ensuring desired separation level of beam sources.

EFFECT: reduced rate of call failure in multibeam communication system.

20 cl, 27 dwg

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