Rapid detection and synchronization signal for transmission access

 

The invention relates to systems and networks, spread spectrum and multiple access, and more particularly to the elimination of the (initial) uncertainty synchronization in the transmission taken on the access channels in the system spread spectrum communications. The technical result is the elimination of uncertainty synchronization. System and method for rapid detection of synchronization transmission access using the probe access, which is transmitted by the speed. The first stage of the preamble probe access extended short psevdochumoy (PN) code pair. The second stage of the preamble probe access expanded as short PN code pair and the long PN code. Transfer probe access levels reduces the number of hypotheses and, therefore, the time required for the receiver is attempting to detect the probe access. 7 C. and 26 C.p. f-crystals, 2 tab., 10 Il.

The technical field to which the invention relates

The present invention relates to systems and networks, spread spectrum and multiple access. More specifically, the present invention relates to the elimination of (initial) uncertainty synchronization in the transmission taken on the access channels in the communication system with stupa for transferring information between a large number of system users. However, methods of modulation spread spectrum, for example, used in communication systems, multiple access and code division multiplexing (mdcr), provide significant advantages over other modulation systems, especially when providing services to a large number of users of the communication system. Such methods are disclosed in U.S. patent No. 4901307, issued February 13, 1990, "Spread Spectrum Multiple Access Communication System Using Satellite or Terrestrial Repeaters," and U.S. patent No. 5691974, issued November 25, 1997, "Method And Apparatus For Using Full Spectrum Transmitted Power In A Spread Spectrum Communication System For Tracking Individual Recipient Phase Time And Energy, the rights to which are owned by the owner of the rights in the present invention.

In the above patents discloses a communication system with multiple access, in which each of a large number of typically the mobile or remote system user uses at least one transceiver for communication with other users of this system or other users connected to it systems, such as switched telephone network (PSTN). The transceivers communicate through gateways and satellites or terrestrial base stations (sometimes also referred to as cell sites or cells).

The base station obispado on the earth's surface. In any system, the increase in throughput can be achieved by splitting the accepted geographic regions into sectors. Cells can be divided into "sectors" through the use of directional antennas at the base station. Similarly, the area of the satellite can be geographically divided into "light" through the application of the antenna system forming such rays. These methods divide the service area can be interpreted as the establishment of separate zones through the use of interconnected directional antennas or spatial multiplexing. In addition, if there is enough available bandwidth to each of these elements, split, or sectors, or rays, can be assigned to multiple channels mdcr through the use of frequency multiplexing (NMP). In satellite systems, each channel mdcr is defined by the term "cubloc" as one "beam" can have several such sbloca.

In communication systems, where used mdcr, for transmitting communication signals to a gateway or base station or gateway or base station uses a separate line. The straight line refers to line the base station (gateway) - user terminal the indicators. The reverse link refers to the communication line terminal user - base station (gateway), and signals are generated in the user terminal and transmitted to the gateway or base station.

The reverse link consists of at least two separate channels: the access channel and reverse traffic channels. The access channel is used by one or more user terminals with the division of time for initiation message or reply to a message from a gateway or base station. This process of information exchange is defined as the transfer of access, or probe access. The reverse trafc channel is used to transmit user information and signals from the user terminal to one or more gateways or base stations during a call or call setup. Structure or Protocol for access channels, messages and calls are disclosed in Standard IS-95 industry Association telecommunications (TIA) Mobil Station - Base Station Compatibility Standard For Dual - Mode Wideband Spread Spectrum Cellular System".

In a conventional communication system with spread spectrum for modulation, or "extensions" of information signals of a user on a predetermined spectral band prior to modulation of the carrier for transmission in the form of signals due the PN expansion is a method of transmitting spread spectrum, well-known specialists in the field of technology, which produces a signal for transmission with a bandwidth much greater than the data signal. In a straight line to distinguish between signals transmitted by different base stations, or transmitted in various rays, as well as multipath signals are used PSH extends codes or binary sequence. These codes usually are shared by all communication signals in a given cell, the beam or soluce.

In some communication systems, the same set PSH extends codes straight line is also used in the reverse link, as to channel traffic and access channel reverse link. In other proposed systems for direct connection of the communication line and a return line connection uses a different set of PSH extend codes. In some other communication systems is proposed to use different sets of noise reduction extends codes in the channel traffic and access channel reverse link.

PSH expansion is performed using a pair pseudotumour (PN) code sequences, or PN code pair, to modulate or "extensions" of information signals. Typically, one PN code sequence used for mi quadrature (Q) channel. This PSH modulation or encoding is performed before the modulation of the information signal by the carrier signal and transmitting the gateway or base station as communication signals in a straight line. Sometimes PSH extends codes are also called short PN codes or sequences, since they are relatively short compared to other PN codes or code sequences used by the communication system.

In a specific communication system can be used short PN code sequences with different length depending on whether the channels of direct communication line or the return line. For direct lines of communication short PN sequences typically have a length of from 210to 215code elements. These short PN codes are used to distinguish between signals transmitted by different satellites or gateways and base stations. In addition, recognition of the rays of a specific satellite, or honeycomb, used shifts the timing of this short PN code.

For a return line communication satellite system short PN codes have a sequence length of about 28code elements. These short PN sequences are used in order to give the opportunity for the communication, avoiding the complexity associated with the use of "longer" short PN codes used in the direct line of communication. In this context, the term "short PN codes" refers to the short PN code sequences (28code elements) used in the reverse link.

Another PN code sequence related to the code forming channels, is used to distinguish the communication signals transmitted by different user terminals in a cell or soluce. PSH codes forming channels is also considered to be long codes, because they are relatively "long" compared to other PN codes used in the communication system. The long PN code, typically has a length of about 245code elements. Usually the message access is modulated long PN code or a specific "masked" version of this code modulation his short sword, code and serial transmission in the form of probe access to the gateway or base station. However, the short PN code and a long PN code can also combine to modulate the message access.

When the receiver is in the gateway or base station receives the probe access, he must roll this probe access to get the message access. This is done put the sh code pairs modulated accept message access. To determine which of the hypotheses is the best estimate for a given probe access, we computed the correlation between this hypothesis and the probe access. Choose the hypothesis that produces the largest correlation, usually in relation to a predetermined threshold value. Once a suitable hypothesis is defined, probe access curls using the selected hypotheses to receive access.

The uncertainty of the timing is a problem for systems spread spectrum communications. This uncertainty synchronization corresponds to the uncertainty of the beginning of the PN code sequences, i.e. the starting point or the synchronization code. With growing uncertainty synchronization requires the formulation of a larger number of hypotheses to determine the beginning of the PN code sequences. Correct demodulation of signals in such communication systems depends on "knowledge" (information) where different PN code sequences have their origin in the incoming signal. The failure detection of the beginning of the PN code sequences, or correct synchronization in the time, makes it impossible for demodulation of the received signal.To deal with uncertainty synchronization, the receiver gateway may need to analyze tens of thousands of hypotheses. Such analysis may take several seconds, resulting in the establishment of lines of communication delays, unacceptable to the user. In addition, because of the limited number of channels in the communication system, a particular user may actually lose access to the communication system within a few minutes, because one or more users can communicate, or call to him.

Such is observed at time intervals (slots). According to this method, the access channel is divided into a number of frames of fixed length, or time intervals (slots) used for receiving signals. Signals usually have access packet structure and packet consists of a preamble and parts for messages and must come at the beginning of the detected time interval (slot). The absence of a detection probe access during a specific frame causes the transmitter, seeking access, again, will send a probe access, to enable the receiver again to discover this probe during the next frame. Multiple access signals coming together, "come together in conflict and their detection does not occur that requires retransmission. In any case, the timing of the serial transmission of the access failure is detected at the first attempt is based on a time delay equal to a random number of time intervals (slots), or frames. The delay upon detection of the probe is increased by the delay associated with the installation of circuits detection in the receiver in its original state, to see the different hypotheses and the delay associated with other probes detected first, as mentioned in the da is not found, at least within practically acceptable time.

Thus, if the assumed uncertainties synchronization is necessary to have a system and method for rapid detection probe access systems, spread spectrum communications.

The invention

The present invention provides a new and improved system and method for rapid detection and synchronization probe access from the user terminal is designated for transmission in the communications system spread spectrum. Preferably, first not to extend the probe access short psevdochumoy (PN) code pair and the long PN code, and run the extension probe access levels. During the first stage of the preamble of the probe access containing empty data, first extends only a short sword, a code pair. During the second stage preamble probe access is expanded as short PN code pair and the long PN code.

To extend the probe access speed is to reduce the total number of hypotheses, which will require the receiver to deal with uncertainty synchronization probe access. During the first stage of the probe access the receiver uses the function or operation of the rough search for Opredelitel block coarse search. The definition of the short PN code pair partially eliminates the uncertainty synchronization function of the length of the short PN code pair. During the second stage probe access once the receiver has determined used a short PN code pair, the receiver uses the function or operation of the exact search to determine the long PN code, which is modulated empty data of the preamble, which is also expanded as the short PN code pair, and a long PN code, which may be provided by block exact search. Determination of the long PN code completely eliminates the uncertainty synchronization probe access.

The characteristic of the present invention is to reduce the total number of hypotheses required by the receiver upon detection of a signal or probe access. Reducing the number of hypotheses leads to the reduction of the time interval required for capture probe access. Thus, the user terminal experiences a much lower latency in the communication system compared with systems using known methods. Reducing the number of hypotheses increases the probability of establishing a connection between the user terminal and the gateway.

List of figures

Goal prizna with the accompanying drawings, in which the same reference position mark on all the drawings the same elements and in which:

Fig.1 - example of a wireless communication system constructed and operating according to one variant of implementation of the present invention; and

Fig.2 is an example implementation of the communication lines used between the gateway and the user terminal in the communication system;

Fig.3 is a more detailed view of the access channel;

Fig.4 - known Protocol for transmission of probe access in a conventional communication system mdcr;

Fig.5 Protocol for the transmission of probe access according to one variant of implementation of the present invention; and

Fig.6 is a structural diagram of the transmitter of the access channel according to one variant of implementation of the present invention; and

Fig.7 is a structural diagram illustrating in more detail the switch speed of the preamble in the transmitter of the access channel in Fig.6;

Fig.8 is a structural diagram illustrating in more detail another option selector stages of the preamble in the transmitter of the access channel in Fig.6;

Fig.9 is a block diagram of the receiver channel access according to one variant of implementation of the present invention

and

Fig.10 is a state diagram illustrating the operation of the receiver channel dostopyatov of carrying out the invention

The present invention is directed to a system and method for rapid detection probe access spread spectrum communications. In one embodiment of the present invention detectable probe access is transmitted by a user terminal or mobile station to the gateway or base station.

In the conventional system with mdcr base station in a predetermined geographical area, or cell, uses multiple modems, spread spectrum, or transmitting or receiving modules for processing communication signals to system users in the service area of a base station. Each receiving module is typically used digital data receiver spread spectrum and at least one search receiver, and the corresponding demodulators, etc.,

During normal operations the user terminal to transmit the communication signals between the base station and the user terminal is assigned to a particular transmitter and a particular receiver module, or the modem at the base station. In some cases, to provide signal processing with diversity can be used multiple receiving modules.

For communication systems that use satellites that transmit and pivot communication with system users by transmission of communication signals through satellites. In addition, there may be provided and other control centers that communicate with satellites or gateways to maintain control of all system traffic and synchronization signals.

I. General system overview

In Fig.1 shows an example wireless communication line, constructed and operational according to the present invention. In the communication system 100 in communication with the user terminals (shown as terminal 126 and 128) having wireless data terminals and phones, used modulation methods with extended range. In terrestrial systems, the communication system 100 communicates with the terminals 126 and 128 users through the system base station (shown as base stations 114 and 116). System type cellular telephone systems in major Metropolitan areas can have hundreds of base stations 114 and 116, which serve thousands of terminals 126 and 128 users using terrestrial repeaters.

The mobile station or a user terminal, 126 and 128 have or contain each block of wireless communication, such as (but not necessarily is) a cellular telephone, transceiver, data or block data transfer (for example, computers, personal electronic assistants, facsimile is raised or portable, or installed on the vehicle, depending on the need. Although this implies that the user terminals are mobile, it is obvious that the concept of the invention is also applicable to a stationary blocks or other types of terminals that require remote wireless communication services. The last type of service is particularly suitable when using satellites to establish lines of communication in many remote regions of the world.

Examples of user terminals are disclosed in U.S. patent No. 5691974, to which reference was made above, and in the application No. 08/627830 for the grant of a U.S. patent for the invention "Pilot Signal Strength Control For A Low Earth Orbiting Satellite Communication System", and in application No. 08/723725 for the grant of a U.S. patent for the invention "Unambiguous Position Determination Using Two Low-Earth Orbit Satellite".

If we are talking about satellite systems, the communication system 100 uses satellites (shown in the form of satellites 118 and 120) and system gateways (shown as gateways 122 and 124 for connection with the terminals 126 and 128 users. Gateways 122 and 124 sends communication signals to terminals 126 and 128 users via satellites 118 and 120. In satellite systems to a larger number of users over a large geographic region is typically used small colic, they usually cover non-overlapping geographic regions. Many rays with different frequencies, which are also called channels mdcr, "sublocale" or signals NMP, frequency intervals (slots) or frequency channels may be directed so as to overlap the same region. However, it is clear that the area of coverage or service of the beam for different satellites, or directional antennas for land mobile stations, may fully or partially overlap in this region depending on the engineering solutions used in the communication system, and type of services provided. Between any of these regions or blocks may be provided diversity and change channels of communication transfer service. For example, each block can provide services for different sets of users with different characteristics at different frequencies, either this mobile unit can use a variety of frequencies and/or multiple service providers, overlapping each geographic service area.

As shown in Fig.1, the communication system 100 uses system controller and switch 112, also referred to as a switching center for mobile communications (CCMS) in nazerat UI design and processing to ensure system-wide control for the base stations 114 and 116 or gateways 122 and 124. The controller 112 typically has a Central control unit for routing telephone calls between the public switched telephone network (PSTN), the base stations 114 and 116 or gateways 122 and 124 and the mobile units 126 and 128. However, for direct connection to these networks or lines interface the PSTN is typically an integral part of each gateway. Connection line, which connects the controller 112 with different base stations 114 and 116 systems or gateways 122 and 124 may be made using known methods, such as (but not only) dedicated telephone lines, fiber optic lines or microwave or dedicated satellite communication lines.

In Fig.1 as lines 130, 132, 134 and 136 shows some of the possible paths of signals for communication between the base stations 114 and 116 and terminals 126 and 128 users. The arrows on these lines show the approximate direction of the signal line, which is either direct or reverse link, which is shown here only for clarity and which should not be construed as a limitation on the actual pattern signal.

Similarly, in lines 146, 148, 150 and 152 dlstance signals for communication between the gateways 122 and 124, satellites 118 and 120 and the terminals 126 and 128 users. In some configurations, it is also possible and desirable to establish direct lines of communication "satellite-satellite" is shown as an example, line 154.

As it is obvious to experts in the art, the present invention is applicable to ground systems or satellite systems. Thus, further description of the gateways 122 and 124 and the base station 114 and 116 are all together called for certainty gateway 122. Similarly, satellites 118 and 120 are together called satellite 118, and the terminals 126 and 128 users will together be called a terminal 126 of the user. In addition, although it is assumed that the terminal 126 of the user is mobile, it is obvious that the invention is applicable to a stationary blocks that require remote wireless communication services. Although in Fig.1 shows only two satellites, communication systems typically use multiple satellites rotating in different orbital planes. Offered many different multisatellite communication systems, such as system, which is of the order of 48 or more satellites moving in eight different orbital planes in low earth orbit technology is the obvious possibility of applying the present invention to various configurations of satellite systems and gateways, including other orbital distances and sets satellites.

The terms "base station" and "gateway" are sometimes used interchangeably, and gateways are considered as specialized base stations that send messages via satellites and have additional functions with the appropriate equipment to maintain these lines of communication through moving repeaters, while in the base stations use a terrestrial antenna for sending messages within the surrounding geographic region. The control centers also typically perform additional functions implemented in the interaction with gateways and satellites. In some systems, communication terminals of the users sometimes also referred to as subscriber units, mobile units, mobile stations, or simply "users", "mobile objects" or "subscribers" depending on preference.

II. The line

In Fig.2 presents an example implementation of the communication lines that are used between the gateway 122 and the terminal 126 of the user in the communication system 100. To facilitate the transfer of communication signals between the gateway 122 and the terminal 126 of the user in the communication system 100 uses at least, and usually two linebetween signals 215 transmission, received from the gateway 122 (or base stations) to the terminal 126 of the user. Return line 220 communication processes signals 225 transmission, which is transmitted from the terminal 126 of the user to the gateway 122 (or base station).

The straight line 210 communication includes a transmitter 212 of the straight line and the receiver 218 a straight line. In one embodiment of the invention, the transmitter 212 of the straight line is implemented in the gateway 122 (base station) in accordance with known methods of communication with mdcr, disclosed in the patents referred to above. In yet another embodiment of the invention, the receiver 218 direct line of communication implemented in the terminal 126 of the user in accordance with known methods of communication with mdcr, disclosed in the patents referred to above.

Return line connection 220 includes a transmitter 222 return line and receiver 228 return line connection. In one embodiment of the invention, the transmitter 222 return line connection is implemented in the terminal 126 of the user. In yet another embodiment of the invention the receiver 228 return line connection is implemented in the gateway 122 (base station).

Return line connection 220 contains at least two channels: one or more Kahn the parties or with the same receiver, working in different modes. As was disclosed above, the access channel is used by the terminals 126 users initiate messages or reply to messages using the gateway 122. At any given point in time for each active user requires a separate access channel. In particular, the access channels are shared in time multiple terminals 126 users, and the transmission from each active user is separated in time from each other. The systems can be used one or more access channels depending on such known factors as the desired level of complexity gateway and synchronization access. The proposed use from 1 to 8 channels on one frequency. Further, the access channel is disclosed in more detail.

III. Channel access

In Fig.3 channel 300 access presents in more detail. The channel 300 access includes a transmitter 310 of the access channel receiver 320 of the access channel and the probe 330 access. The transmitter 310 of the access channel is included in the transmitter 222 return line of communication open up. The receiver 320 of channel access is included in the receiver 228 return lines of communication open up.

The channel 300 access is used to exchange short strech marks, outgoing from the terminal 126 of the user and intended for gateway 122. To the terminal 126 of the user initiated messages or respond to messages using gateway 122 (or base stations), by channel 300 access the signal, called signal or access probe 330 access.

Typically, the access channel is associated with one or more special paging channels used in the communication system. This allows us to more effectively respond to the paging message (message retrieval call) taking into account the fact that the system has information about where to find the transfer access of the user terminal in response to the paging signals (signals a search of the call). This Association or correspondence may be known based on engineering decisions taken when designing the system, or may be indicated to the user terminals in the structure of the paging messages. As is known, when using the approach based on the access channels with time intervals (slots), the access channel is divided into a number of frames of fixed length, or time intervals (slots) during which the user terminals can be transfer or probes access.

IV. Neapredelionniy distance or path length of the signal propagation between the terminal 126 of the user and relay satellite 118, as a result of rotation of the satellite 118 around the Earth. This uncertainty synchronization is within the borders defined by the minimum and maximum delays of signal propagation. The minimum propagation delay Dminrepresents the time interval of the signal from terminal 126 of the user to the satellite 118, when the satellite 118 is directly above the terminal 126 of the user. Maximum propagation delay Dmaxrepresents the time interval of the signal from terminal 126 of the user to the satellite 118, when the satellite 118 is located at a predetermined convenient to the horizon line terminal 126 of the user. Similarly some uncertainty synchronization may occur due to relative movement of the user terminal and the base station 114, although usually this additional uncertainty is lower.

Removing uncertainty synchronization is necessary in order to correctly detect the probe 330 access. In particular, in order to minimize the probe 330 access or the content of his message using long and short PN codes must be defined synchronization (i.e., the beginning of the PSH etesami synchronization to determine the hypothesis synchronization which gives the best score for a decision on the probe 330 access. Hypothesis synchronization shifted in time relative to each other and represent different estimates synchronization probe 330 access or PN codes used to generate the probe. The hypothesis, which forms the maximum correlation with the probe 330 access, usually the one that exceeds a predetermined threshold value, and is the hypothesis with the most likely estimate (which is considered "correct") synchronization for this particular probe 330 access. As only in this way eliminated the uncertainty of the timing probe 330 may be minimized with the use of this assessment synchronization and long and short PN code in accordance with known methods.

V. Known Protocol for transmission of probe access

In Fig.4 shows a known structure or Protocol 400 for transmitting a known signal 410 access, also called probe access, channel access, used in the known communication system with mdcr. When the terminal 126 user wishes to obtain access to the communication system 100, that is, to initiate messages or reply to messages, the terminal 126 of the user transmits a known signal s preamble 420 probe access (the preamble) and the message 430 probe access (Internet message access). Known probe 410 access is transmitted by the transmitter 310 of the access channel, located in the terminal 126 of the user on the receiver 320 of the access channel, located in the gateway 122.

In a known system with spread spectrum as the preamble 420, and the message 430 access is subjected to quadrature expansion using a pair of short pseudotumour code sequence short PN code pair 440 and form a channel with long psevdochumoy code sequence (long PN code). First, in order to enable the receiver 320 of the access channel to detect the probe 410 access before a message will be sent 430 access is transmitted preamble 420, usually containing empty data (i.e., all "1" or all "0" or a pre-selected combination of "1" and "0").

Short PN code pair 440 is used to modulate or "extensions" of information signals. Pseudosolenia modulation or encoding is performed before the information signal modulated by a carrier signal and transmitted to the gateway 122. Short PN code pair 440 is used to distinguish between communication signals that are transmitted over separate channels mdcr. In one embodiment of the present invention the short PN code pair 440 is 0 links. According to one variant of implementation of the present invention, each gateway 122 uses its own short PN code pair 440. In other embodiments, implementation of the present invention for each frequency band in the gateway 122 based on the provided traffic volume is different from other short PN code pair 440. In these embodiments assume the use of up to eight short PN code pairs 440 on the gateway. However, for this function can be used and a different number of PN code pairs, more or less.

To distinguish between communication signals transmitted from different terminals 126 of the user within the same cell or beam used by a long PN code 450. Typically, in known systems, the preamble 420 and the message 430 access modulate or encode the long PN code 450 to their expansion short PN code pair 440. However, in other known systems, the short PN code 440 and a long PN code 450 can be combined and then used to modulate the preamble 420 and messages 430 access.

When the receiver 320 of the access channel receives the preamble 420, the receiver 320 of channel access must roll the preamble 420, using a short PN code pair 440 and a long PN code 450. This is done put odawa pair 440 modulated empty data contained in the preamble 420. Set the correlation of this hypothesis preamble 420. The results of the correlation of the preamble 420 with each of the hypotheses are compared. Choose the specific hypothesis that gives the maximum correlation from the point of view of the level or energy (signal). Specific long PN code 450 and specific short PN code 440, which belong to this hypothesis, is used for demodulation of the probe 410 access. It is possible that in order to ensure detection of the probe 410 access transmission will be repeated.

As soon as the receiver 320 of the access channel will determine the short PN code pair 440 and a long PN code 450, known probe 410 access is detected. After transmission within a predetermined time interval of the preamble 420 transmitter 310 of the access channel transmits a message 430 access. As was disclosed above, the message 430 extend access using the same short PN code pair 440 and the same long PN code 450, which would be used to extend the preamble 420 in accordance with a known Protocol or structure 400 of signal access.

Preamble 420 should be long enough so that the receiver 320 of the access channel had time to process hypotheses and discovery of known probe torture to detect known probe 410 access at a time when will be transmitted to the message 430 access. In this case, the message 430 access will be made incorrectly. The time required for detection probe 410 access, called the detection time depends on how many receivers are used in parallel for processing hypotheses, what is the length of the different code sequences, what is the range of uncertainty synchronization with the transmission of signals, and so forth. Each of these factors affect the number of hypotheses that must be generated, and the time required for detection of known probe 410 access. In addition to the factors affecting the detection time, to minimize conflicts arising between the probes 410 access passed various terminals 126 user, choose the length and frequency of the preamble 420. Obviously, when determining the length of the preamble 420 each of these factors are considered in the light of the considerations that formed the basis for engineering decisions made when designing the system.

The present invention uses the structure or Protocol signal transfer access probe access, requiring much fewer hypotheses than necessary for the known is but the present invention

In Fig.5 presents the structure or Protocol 500 signal for transmission of the probe 510 access according to one variant of implementation of the present invention.

The probe 510 access includes preamble 520 probe access (the preamble) and the message 530 probe access (Internet message access). One fundamental difference of the Protocol 500 from a well-known Protocol 400 is that the preamble 520 initially expanding, or modulated, only a short sword, a code pair 440, and then modulated as PSH pair 440 and a long PN code 450. This allows the receiver 320 of the access channel to eliminate uncertainty synchronization by using only the short PN code pair 440. In contrast, according to the known Protocol 400 to eliminate the uncertainty of the timing you want to use as short PN code pair 440 and a long PN code 450.

Speed modulation of the preamble 520, that is, first only using a short PN code pair 440, and then using a short PN code pair 440 and a long PN code 450, significantly reduces the number of hypotheses required by the receiver 320 of the access channel for detection of the probe 510 access. By reducing the number of hypotheses accordingly reduced and time is ACLs present invention preamble 520 is transferred in two stages: preamble 560 first stage and the preamble 570 of the second stage. In the preamble 560 first stage preamble 520 modulates short current code pair 440 in a time interval of sufficient length to ensure that the receiver 320 of the access channel had the opportunity to determine the synchronization of the short PN code pair 440.

In the preamble 570 second stage preamble 520 is modulated as a short PN code pair 440 and a long PN code 450. Preamble 570 second stage is transmitted by the transmitter 310 of the access channel during a time interval of sufficient length to allow the receiver 320 of the access channel to determine the synchronization of the long PN code 450. By the end of the preamble 570 second stage of the receiver 320 of channel access should detect the probe 510 access.

After the preamble 570 second stage of the transmitter 310 of the access channel is passed to step 580 messages. When transferring step 580 messages message 530 is modulated as a short PN code pair 440 and a long PN code 450.

Thanks to the transmission of the preamble 520 steps reduces the number of hypotheses required to deal with uncertainty synchronization and detection of the probe 510 access. In the system using a known Protocol 400, the required number of hypotheses is determined by multiplying the uncertainty than the private access code for uncertainty synchronization requires one hypothesis. In other words, during the uncertainty should be estimated synchronization of each potential VS code (i.e., the beginning of the probe access).

In a preferred embodiment of the present invention, the receiver 320 of the access channel partially eliminates the uncertainty synchronization through the first collapse of the preamble 560 first stage, using previously known short PN code pair 440. Since it is expected that the short PN code pair 440 is much shorter than the uncertainty of the timing, the number of hypotheses required to detect a short PN code pair 440 is equal to the number of start points codes, or moments of time, it is possible for a short PN code pair 440. Thus, for the short PN code pair 440 256 number of hypotheses required to detect a short PN code pair 440, will be 256.

In a preferred embodiment of the present invention, the receiver 320 of channel access eliminates the uncertainty synchronization by coagulation of the preamble 570 second stage, using as is known in advance short PN code pair 440 and known in advance of the long PN code 450. After the discovery of a short PN code pair 440 in synchros code pair 440. In other words, during the interval of uncertainty of timing short PN code pair 440 is repeated an integer number of times. The number of repetitions is equal to the number of hypotheses that must be formed during the transmission of the preamble 570 of the second stage. This number is determined by dividing the interval of uncertainty synchronization period is short PN code pair 440.

The total number of hypotheses, which is required in the present invention to eliminate the uncertainty synchronization is defined as the sum of the hypotheses required for the preamble 560 first stage and the preamble 570 of the second stage. A comparison of the number of hypotheses required to deal with uncertainty synchronization shown in Table I. Table I compares the number of hypotheses required for the system, which is known probe 410 access system that uses a probe 510 access with the short PN codes of different lengths (L) in accordance with the present invention. Table I made as an example for a communication system with mdcr frequency code elements 1,2288 million items per second and uncertainty synchronization component 10 milliseconds. In the above example, the comparison of hypotheses with half the code is sustained fashion, given the uncertainty of the frequency value. According to one variant of implementation of the present invention uncertainty frequency is fixed during transmission of the preamble 560 first stage, while the uncertainty of the timing completely eliminated during transmission of the preamble 570 of the second stage. In this embodiment, the number of hypotheses required for the preamble 560 first stage, increasing the number of hypotheses to be tested for frequency (e.g., N), while the number of hypotheses required for the preamble 570 second stage remains unchanged. A number of hypotheses for the frequency N depends on factors well known to specialists in this field of technology, namely the expected value of Doppler effects and other frequency shifts, as well as the size and number of elements on the sampling frequency used for the separation of the General investigated the frequency space. The number of hypotheses required for decision-making as synchronization and frequency for the same systems as outlined above in Table I, are compared in Table II.

VII. Transmitter channel access

In Fig.6 shows a structural diagram of the transmitter 310 of the access channel is a preprocessor 610 data transmission, generator 635 long codes, the switch 640 stages of a preamble and a post-processor 690 data transfer.

The preprocessor 610 data transmission performs pre-processing of data transmitted in accordance with different methods of processing signals used in communication systems with mdcr. In the example embodiment of the present invention, the CPU 610 of the data transmission contains an encoder 615, the repeater 620 symbols interleaver 625 and M-ary orthogonal modulator 630. The preprocessor 610 data transmission may contain these elements, and other elements of pre-treatment, provided it is not beyond the scope of the present invention. Specialists in the art familiar with the various kinds of signal processing and related items used for the preparation of the information signals.

Further disclosed an exemplary embodiment of the preprocessor 610 data transmission. In this embodiment, the encoder 615 is a known encoder that encodes data using the function generator, well known to specialists in this field of technology. Encoder 615 receives data at its input, in the form of bits and outputs data in the form of a code simvolicheskuu code symbols per frame at different speeds. Interleaver 625, typically a block interleaver that performs interleaving of code symbols in accordance with well known methods. M-ary orthogonal modulator 630 modulates the alternating code symbols using the process of modulation M-ary orthogonal code. These M-ary orthogonal codes can be a function or Walsh codes, which are known to be commonly used in communication systems with mdcr.

Each group code log2M appears in one of M mutually orthogonal modulation symbols, which can be called symbols of the Walsh when orthogonal codes are Walsh codes. In this embodiment, the present invention uses a 64-ranks orthogonal modulator. Thus, in this embodiment, each Walsh symbol consists of 64 elements Walsh, and 6 of the code characters are displayed in one character or orthogonal Walsh code. As it is obvious to experts in the field of technology, you can use codes different lengths, with other sets or the number of code symbols.

The switch 640-speed preamble receives data from the preprocessor 610 data transfer, and the long PN code 450 from the generator 635 long 40 degrees preamble disclosed in more detail below.

The postprocessor 690 data transfer performs the post-processing information from the switch 640 steps in the preamble to its transmission. In the example embodiment of the invention the postprocessor 690 data transmission modulator contains 645 I-channel generator 648 short code I-channel modulator 650 Q-channel generator 649 short code Q channel, delay or item 655 delay band-pass filter 660 baseband I-channel band-pass filter 665 baseband Q-channel modulator 670 carrier signal of the I-channel modulator 675 carrier signal of the Q channel and a combiner 680 signals. The postprocessor 690 data transmission may contain these elements, and other elements for post-processing if it is not beyond the scope of the present invention. For example, the transmitted signal may not contain in-phase and quadrature components, as has been disclosed above. In other words, the system 100 may not be used for phase shift keying. In this example, can be used only one path signals in the postprocessor 690 data transmission. Thus, it is obvious that this example uses only one of the generators 648, 649 short codes, one of the bandpass Filini transmission performs various filtering and modulation in accordance with the methods known in communication systems with mdcr.

In a preferred embodiment of the present invention the output signal from the switch 640-speed transmission of the preamble is subjected to quadrature expansion using a short PN code pair 440 from generators 648, 649 short codes via modulators 645 and 650. Short PN code pair 440 contains sequences that are sometimes referred to as the PN sequence of the pilot signal Q and PN sequence pilot-signal I. This terminology is preferred for cases in which short code pair 440 is selected to align with the short PN codes straight line as in cellular and in some satellite communication systems. In other cases, the term pilot signal need not be used for codes that apply only to a return line, where the pilot signal is not used, or only for channel access. Generator 648 shortcode generates a PN sequence I (PNI). Generator 649 shortcode generates a PN sequence Q(PNQ). I and Q sequences can be completely different or identical sequences, one sequence is shifted relative to the other is) generators 648, 649 short codes are replaced by a single generator 648 short code and delay. In this alternative embodiment, the output signal of generator short code is fed directly to the modulator 645, and then to the modulator 650 after a delay. Modulators 645, 650 may be implemented using combiners, multipliers, adders modulo 2 or other obvious methods.

In one embodiment of the present invention after modulation generator 649 short code PN sequenceQis delayed relative to the sequence PNIhalf of the time interval PN code element using the delay 655. In this embodiment, the present invention is a delay of half a code element provides the offset for phase manipulation and improves envelope power for the subsequent bandpass filtering modulating frequencies.

After expansion output signals are fed into the filters 660, 665 modulating frequencies and modulate the carrier signal by modulator 670, 675, respectively. The resulting modulated signals are combined using combiner 680 and transmitted in accordance with known methods of communication.

V is the Eney of the preamble. The switch 640 stages of the preamble contains the first switch 710, the second switch 720, two generator 730 blank codes and the modulator (or expanding element) 740. The first switch 710 has two extreme positions, and the first extreme position indicated by the symbols a, b, and a second extreme position indicated by the symbol S. the Second switch 720 has two extreme positions, and the first extreme position indicated by symbol A, and the second extreme position indicated by the symbols B, C. "A" identifies the end position of the first switch 710 and the second switch 720 during generation or transmission of the preamble 560 first stage. "In" indicates the end position of the first switch 710 and the second switch 720 during generation or transmission of the preamble 570 of the second stage. "C" identifies the end position of the first switch 710 and the second switch 720 during generation step 580 messages. Next with reference to Fig.5 and 7 is disclosed switch operation steps of the preamble. During the preamble 560 first stage of the probe 510 access as the first switch 710 and the second switch 720 are located in the respective end positions indicated by the symbol A. In this position ignores blank data to the modulator 740. During the preamble 560 first-stage output signal 642 consists of empty data. These empty data modulated short PN code pair 440, as was disclosed above. Thus, during the preamble 560 first-stage blank data is modulated short PN code pair 440, but not modulated long PN code 450.

Empty data refers to data with constant or known values, for example, either all "0" or all "1" or a known combination, for example alternating "1" and "0", etc., Blank data is a fixed combination, which is known to the receiver and is used for detection of the probe 510 access. Empty data do not contain any message. In this embodiment, the present invention is empty, the data are all "1".

Once the receiver, for example receiver 320 of the access channel has been enough time to determine the short PN code pair 440 from the preamble 560 first stage is transmitted preamble 570 of the second stage. During the generation or transmission of the preamble 570 second stage of the first switch 710 and the second switch 720 are arranged in the respective end positions indicated by the symbol C. In this position, the first switch 710 food is a long sword, code 450. During the generation or transmission of the preamble 570 second-stage output signal 642 consists of empty data modulated long PN code 450. The output signal 642 is modulated after this short PN code pair 440, as was disclosed above. Thus, during the preamble 570 second-stage blank data is modulated as long PN code 450 and short PN code pair 440.

Once the receiver (the receiver 320 access) got enough time to determine the long PN code 450 from the preamble 570 second stage is passed to step 580 messages. During generation or transmission stage 580 messages first switch 710 and the second switch 720 are arranged in the respective end positions indicated by the symbol S. In this position, the first switch 710 passes to the modulator 740 information 638 channel access, while the second switch 720 continues to skip to the modulator 740 long PN code 450. During step 580 messages output signal 642 contains the message data modulated long PN code 450. Following this, the output signal 642 is modulated short PN code pair 440, as was disclosed above. Thus, during step 580 message message data modulated implementation of switch stages of the preamble. In this embodiment, the switch 640 stages of the preamble contains a switch 810, generator 820 empty code and the modulator (or expanding element) 830. The switch 810 has two extreme positions, where the first extreme position indicated by symbol A, and the second extreme position - characters, S. "A" identifies the extreme position of the switch 810 during the preamble 560 first stage. "B" identifies the extreme position of the switch 810 during the preamble 570 of the second stage. "C" identifies the extreme position of the switch 810 during generation or transmission stage 580 of the message.

Next with reference to Fig.5 and 8 is disclosed a switch 640 stages of the preamble in this embodiment of the invention. During the preamble 560 first stage of the probe 510 access switch 810 is located in the extreme position indicated by the symbol A. In this position, the switch 810 passes all "0" in the modulator 830 generator 820 empty data. At the same time information of the access channel fed to the transmitter 310 of the access channel, contains empty data (e.g., either "0" or "1"). This information is generated and served by a known transmission elements of the user terminal using methods known specialist the Oder 615 can be controlled so to provide a specific desired output signal or the output signal of the modulator 630, or preprocessor 610 may be subject to interruption, and the input signal for the switch preamble 640 is connected to another source, which generates empty data. Thus, information 638 access channel contains empty data processed by the processor 610 data transmission. Information 638 access channel is fed directly to the modulator 830.

A specific combination of an expansion element 830 and generator 820 empty data shown in Fig.8, provides the following: when modulating the output signal generator 820 empty data 638 channel access the result will be identical to the information 638 channel access, which, as was disclosed above, consists of empty data. It is obvious that other combinations of these elements likewise provide the output signal 642 information 638 channel access. Then the output signal 642 is modulated short PN code pair 440, as was disclosed above. As in the previous embodiment, during the preamble 560 first stage empty data output signal 642 modulated short PN code pair 440, but not modulated long PN code 450.

Once the receiver (receiver access 320) got enough time to determine the long PN code 450 from the preamble 570 second stage is passed to step 580 messages. During the transfer step 580 message switch 810 is located in the position indicated by the symbol S. In this position, the switch 810 continues to skip to the modulator 830 long PN code 450. At the same time information of the access channel fed to the transmitter channel access becomes the message data, not empty data. m 610 data transmission. Accordingly, during step 580 messages output signal 642 contains the message data modulated long PN code 450. Following this, the output signal 642 is modulated short PN code pair 440, as was disclosed above. Thus, during step 580 message data message is modulated as long PN code 450 and short PN code pair 440.

IX. Receiver channel access

In Fig.9 presents a block diagram of the receiver 320 of the access channel according to one variant of implementation of the present invention. The receiver 320 of the access channel contains an analog-to-digital Converter (ADC) 910, rotator 920, the first memory 925, inverter 930 for fast Hadamard transform (PBPA), the second memory 935, delay 940, adders 945 and 950, coherent drive 960, the operator 965 squaring, the adder 970 channels and incoherent drive 980.

ADC 910 receives signals I, Q channels from the antenna (not shown) and quantum received signals. Rotator 920 adjusts the frequency of the received signals in order to eliminate the frequency uncertainty in the received signals, which are affected by the Doppler effect and other known effects.

The output signal of the rotator 920 save you. The output signal from PBPA 930 retain in memory 935. Memory 925 and memory 935 operate in accordance with a known process by which data are swapped before and after the operation of the unit. During this process quickly and efficiently is determined by the possible number of shifts for a short PN code pair 440 from the point of view of possible uncertainty synchronization. The output signal of the memory 925, PBPA 930 and memory 935 is a periodic autocorrelation function of the short PN code pair 440.

The remaining parts of the receiver 320 of channel access calculate the energy of a received signal in accordance with well known methods of communication. Delay 940 and adders 945 and 950 calculates the evaluation phase and quadrature component of the received signal. Coherent drive 960 accumulates all in-phase and quadrature components within a pre-selected period. Typically, this period corresponds to the period character. The operator 965 squaring module determines each of the accumulated components. These modules are called coherent sums. The adder 970 channels brings together two coherent sum of the inphase and quadrature channels. Incoherent drive 980 accumulates combined coherent sum on interfaceentry amount 990 refers to useful energy communication signal, correlated or extended by specific time offset short PN code pair 440. Incoherent sum 990 changes its value depending on the relevance or not the shift timing short PN code pair 440 synchronization or shift when the synchronization signal is detected connection.

Incoherent sum 990 is compared with one or more threshold values (not shown) for establishing a minimum level of energy to determine the correct correlation of the signal and, therefore, alignment, synchronization. If incoherent sum 990 exceeds one or more threshold values, the shift timing short PN code pair 440 is a selected shift synchronization, which is in turn used for tracking and demodulation of a communication signal. If incoherent sum 990 does not exceed the threshold value, then checked the new shift synchronization (i.e., another hypothesis), and repeats the aforementioned operations of the accumulation and comparison with the threshold value.

In Fig.10 shows a state diagram illustrating the operation of one possible implementation of the receiver 320 of the access channel. The state diagram represents castanetum begins to work in state 1010 rough search performing a search of the probe 510 access. In state 1010 coarse search receiver 320 of the access channel performs a coarse search. According to a preferred variant implementation of the present invention, the rough search includes search by time and frequency search. When time search is an attempt to capture the short PN code pair 440 used in the probe 510 access. In particular, during this search attempts to determine shift timing for short PN code pair 440 or most of this couple. During a frequency search will attempt to resolve the frequency uncertainty in the probe 510 access.

Search by time and frequency can be performed either sequentially or in parallel. Since it is expected that the uncertainty of the timing more than the uncertainty of the frequency, in one embodiment, the present invention performs a parallel search in time and consistent frequency search. This option is particularly preferred when the receiver 320 of the access channel has PBPA 930. In this embodiment of the invention the rotator 920 increases the frequency to a predetermined value based on the expected uncertainty range of frequencies. Ppreteen increment frequency and a certain synchronization of the short PN code pair 440 maximizes the output signal 990 incoherent drive 980. If the maximum output signal exceeds a predefined threshold, then, at a rough search probe 510 access detected. When this happens, a certain increment frequency eliminates frequency uncertainty, and synchronization of the short PN code pair 440 is partially eliminates the uncertainty synchronization.

If the maximum output signal 990 does not exceed a predetermined threshold value, then, at a rough search probe 510 access is not detected. In this case, the receiver 320 of the channel access status remains 1010 coarse search.

Detecting the probe 510 access, the receiver 320 of the access channel proceeds from the state of 1010 rough search in the state 1020 exact search. Following the transition from the state 1010 rough search in the state 1020 accurate search receiver 320 of the access channel changes the characteristics, in order to detect long PN code 450. In particular, as is well known, the operation of the memory 925, memory 935, PBPA 930 for a long PN code 450 differs from case short PN code pair 440. According to one variant of implementation of the present invention, the memory 925, memory 935, PBPA 930 undergo reconfiguration to search long PN code 450. In another embodiment, there are separate specializirovannomu PN code pair 440, and the receiver 320 of the access channel long code is used to detect the long PN code 450. In this embodiment of the invention, the memory 925, memory 935, PBPA 930 designed for the detection or short PN code pair 440, or long PN code 450, respectively. In this embodiment, the receiver 320 of the access channel to the short code during the transition from the state 1010 rough search in the state 1020 accurate search switches the synchronization of the short PN code pair 440 to the receiver 320 of the access channel long PN code.

Able 1020 accurate search receiver 320 of the access channel performs an exact search. According to a preferred variant implementation of the present invention the exact search is performed only on time. When performing an exact search attempts to fix the long PN code 450 used in the probe 510 access. While the exact search for the complete elimination of the temporal uncertainty in the probe 510 can be used a certain increment frequency and synchronization of the short PN code pair 440 received in state 1010 coarse search.

The process, similar to the above for the coarse search is used to detect or commit long PN code 450. Separate engravidou signal 990 exceeds a predetermined threshold value, therefore, when the exact search probe 510 access was detected. When this happens, separate sync long PN code 450 eliminates the uncertainty synchronization.

If the maximum output signal 990 does not exceed a predetermined threshold, then when the exact search probe access is not detected. In this case, the receiver 320 of the access channel proceeds from the state 1020 accurate search condition 1010 coarse search to try to locate the probe 510 access.

Detecting the probe 510 access, the receiver 320 of the access channel proceeds from the state 1020 accurate search condition 1030 demodulation of the message. Being able 1030 demodulation of the message, the receiver 320 of the access channel demodulates the message 530 contained in the probe 510, a certain increment frequency and synchronization received when in state 1020 exact search.

If the state 1030 demodulation messages output signal 990 is below a predetermined threshold, then the receiver 320 of the access channel lost probe 510 access. This can happen in a variety of circumstances, including completion of transmission of the transmitter 510 of access or because of any refusal. Regardless of the reason, the por is to attempt to detect the probe 510 access.

X. Conclusion

Although this invention has been described in detail on the example of a specific variants of its implementation, it is obvious that it may be various modifications within the scope of the invention. For example, the invention is equally suitable for transmission, other than transmission on the access channel, which are subject to extension by the many code sequences.

The description of the preferred embodiments of the invention proposed in order to enable specialists in the art to make or use the present invention. Although the invention has been disclosed in detail with reference to the preferred options for its implementation, specialists in the art it is obvious that can be made various changes in form and in specific details that do not change the nature and scope of the invention.

Claims

1. System for wireless communications, containing a transmitter for transmitting a probe access, which includes the preamble and the message, and the preamble is of the first stage and the second stage, the first stage of the preamble data, the modulated first signal, and the second step priami block coarse search block exact search moreover, the block coarse search provides the definition of the first shift synchronizing the first signal relative to the first stage of the preamble, and the block accurate search provides the definition of the second shift synchronization of the second signal relative to the second stage of the preamble, and based on the first shift synchronization.

2. The system under item 1, in which the first signal and the second signal are pseudocumene sequences.

3. The system under item 1, in which the first signal and the second signal are coding sequences.

4. The system under item 1, in which the first signal is a pair of quadrature expanding pseudo-random sequences.

5. The system under item 1, in which the second signal is a pseudo-random sequence, to form channels.

6. The system under item 1, in which the data of the first stage of the preamble are blank data.

7. The system under item 6, in which the data of the second stage of the preamble are blank data.

8. How to send a probe access probe access contains the preamble and the message and the preamble is the first step and the second step consists in the fact that perform the modulation of the first stage of the preamble of the first signal, transmit the modulated first step Preah is a, modulate the second stage of the preamble of the first signal and the second signal, and transmit the modulated second stage of the preamble after the transmission of the modulated first stage of the preamble in a period of time sufficient for detection by the receiver of the second shift synchronizing the second signal, modulate the message the first signal and the second signal and transmit the modulated message after transmitting the modulated second stage of the preamble.

9. The method according to p. 8, in which the first signal is a pair of quadrature extend pseudotumour sequences.

10. The method according to p. 8, in which the second signal is a pseudo-random sequence, to form channels.

11. Probe access to provide the receiver the possibility to quickly identify synchronization associated with probe access, contains a preamble having a first stage and the second stage, the first stage of the preamble of the first modulated code sequence, the second stage of the modulated preamble of the first code sequence and the second code sequence, and the first stage of the preamble is transmitted to the second stage of the preamble, to enable the receiver to determine the synchronization of the first code after the sequence, modulated at the second stage of the preamble, thereby reducing the time interval required for the receiver to determine synchronization.

12. Probe access on p. 11, additionally containing the message following the preamble and the message modulated first code sequence and the second code sequence.

13. Probe access under item 11, in which the first code sequence is a pair of quadrature extend pseudotumour sequence and the second code sequence is psevdochumoy sequence, forming channels.

14. Method detection receiver transmission channel access transmitted from the transmitter, and the transmission has a preamble, and the preamble is the first step and the second step consists in the fact that a coarse search in the transfer adopted by the receiver during the first stage of the preamble, including search by time and frequency, and the first stage of the preamble of the modulated first signal, and determine when coarse search shift synchronization of the first signal, perform an exact search in the transfer adopted by the receiver during the second stage of the preamble, including search by time and frequency, and the second stage of Preah is the second signal, and the shift synchronization of the second signal is determined using the first signal and shift the timing of the first signal, and demodulated transmission using the first signal, second signal, shift the timing of the first signal and shift the timing of the second signal.

15. The method according to p. 14, in which the first signal and the second signal are pseudocumene sequences.

16. The method according to p. 14, in which the first signal is a pair of quadrature extend pseudotumour sequence and the second signal is psevdochumoy sequence, forming channels.

17. The method according to p. 14, in which the first stage of the preamble contains empty data.

18. The method according to p. 14, in which the second stage of the preamble contains empty data.

19. How to use the signal of the wireless communication system, which performs transmission probe access, containing the preamble and the message, and the preamble is of the first stage and the second stage, the first stage of the preamble data, the modulated first signal, and the second step of the preamble has the data modulated by the second signal and the first signal, take the probe access, define the first shift synchronizing the first is the IR during the first stage of the preamble, determine a second shift synchronization of the second signal relative to the second stage of the preamble by performing accurate searches in the transfer adopted by the receiver during the second stage of the preamble, while the second stage preamble modulate the first and second signals, the shift synchronization of the second signal is determined using the first signal and the shift synchronization of the first signal.

20. A transmitter for transmitting a probe of access, including the preamble and the message preamble is the first stage and the second stage, the first stage of the preamble data, the modulated first signal, and the second step of the preamble has the data modulated by the second signal and the first signal.

21. The transmitter under item 20, in which the first signal and the second signal are pseudocumene sequences.

22. The transmitter under item 20, in which the first signal and the second signal are coding sequences.

23. The transmitter under item 20, in which the first signal is a pair of quadrature expanding pseudo-random sequences.

24. The transmitter under item 20, in which the second signal is a pseudo-random sequence, to form channels.

25. The transmitter under item 20, in which the first stage preamble data.

27. Receiver channel access for receiving probe access probe access contains the preamble and the message and the preamble is the first step and the second step, the receiver channel access block contains coarse search block exact search, and block coarse search provides the definition of the first shift synchronizing the first signal relative to the first stage of the preamble, and the block accurate search provides the definition of the second shift synchronization of the second signal relative to the second stage of the preamble, and based on the first shift synchronization.

28. The receiver on p. 27, in which the first signal and the second signal are pseudocumene sequences.

29. The receiver on p. 27, in which the first signal and the second signal are coding sequences.

30. The receiver on p. 27, in which the first signal is a pair of quadrature expanding pseudo-random sequences.

31. The receiver on p. 27, in which the second signal is a pseudo-random sequence, to form channels.

32. The receiver on p. 27, in which the data of the first stage of the preamble are blank data.

33. The receiver under item 32, in which the data of the second stage of the preamble are blank data.

 

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FIELD: radio communications.

SUBSTANCE: proposed method intended for single-ended radio communications between mobile objects whose routes have common initial center involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mentioned mobile objects and destroyed upon completion of radio communications. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning of several radio communication systems.

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1 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer from mobile object to stationary one residing at initial center of common mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhanced its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile object from stationary one residing at initial center of mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects whose routes have common initial center involves use of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety for attending personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in simultaneous functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects having common initial center involves use of low-power intermediate transceiver stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object and destroyed upon completion of radio communications between mobile and stationary objects. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications engineering; digital communications in computer-aided ground-to-air data exchange systems.

SUBSTANCE: proposed system designed to transfer information about all received messages irrespective of their priority from mobile objects to information user has newly introduced message processing unit, group of m modems, (m + 1) and (m + 2) modems, address switching unit, reception disabling unit whose input functions as high-frequency input of station and output is connected to receiver input; control input of reception disabling unit is connected to output of TRANSMIT signal shaping unit; first input/output of message processing unit is connected through series-connected (m + 2) and (m + 1) modems and address switching unit to output of control unit; output of address switching unit is connected to input of transmission signal storage unit; t outputs of message processing unit function through t respective modems as low-frequency outputs of station; initialization of priority setting and control units, message processing unit clock generator, and system loading counter is effected by transferring CLEAR signal to respective inputs.

EFFECT: enhanced efficiency due to enhanced throughput capacity of system.

1 cl, 2 dwg

FIELD: radiophone groups servicing distant subscribers.

SUBSTANCE: proposed radiophone system has base station, plurality of distant subscriber stations, group of modems, each affording direct digital synthesizing of any frequency identifying frequency channel within serial time spaces, and cluster controller incorporating means for synchronizing modems with base station and used to submit any of modems to support communications between subscriber stations and base station during sequential time intervals.

EFFECT: enhanced quality of voice information.

12 cl, 11 dwg

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