Adaptation capacity in multistation network

 

The invention relates to a method of controlling a communications network, and the network contains a number of stations that can transmit data and receive data from each other. The method includes monitoring at each station the quality of the transmission path between this station and each other station with which this station can communicate. Data corresponding to the monitored quality of the route are recorded in each station, thus allowing you to choose the amount of transmit power on the basis of relevant data quality route for data transmission to another station. Thus, increasing the likelihood of transmission of data to any selected station at the optimum power level that is a technical result. Each station transmits data quality route in their own programs, as well as the local noise/interference, so that other stations can receive the data quality of a route for a specific station, even if they are outside the scope of this particular station. The invention extends to a communication device that can be used to implement the method. 2 C. and 18 h.p. f-crystals, 22 ill., table 1.

The prior art Of which realizatsii way.

International patent application WO 96/19887 describes the communication network, in which individual stations in the network can send a message to other stations through the use of intermediate stations for transmission of data messages appropriately. In networks of this type and other multistation networks it is desirable to control the output power of transmitting stations to a level that is sufficient for successful reception of the transmitted data, but which, on the other hand, is as low as possible in order to minimize interference with neighboring stations or with other users of the radio spectrum.

The basis of this of the invention is the provision of a control method multistation communication network.

Summary of invention In accordance with the invention, is provided a method of controlling a communication network containing a number of stations that can transmit and receive data from each other, and the method comprises: monitoring at each station the quality of the route between the station and each other station with which the station is associated; the entry in each station data quality of the route corresponding to the route associated with each referred to the other with whom one associated with the selected other station, when transmitting data in said selected another station, thus to increase the likelihood of the data in said selected another station at the optimum power level.

The quality control of the route between the stations may include monitoring at least one of the characteristics of the channel between stations: the lost route, distortion, phase, time delay, Doppler shift and multi-path fading.

The method preferably includes the data quality of the route corresponding to the route between the first and second station, when the transmission of other data between stations, so that the data quality of the route recorded in the first station, is transmitted to the second station for use by the second station and Vice versa.

The quality of the route in the station receiving data transmission, can be calculated by comparing the measured power of a received transmission data in the transmission, indicating its transmit power.

The station receiving such data, the quality of the route, it is preferable to compare the received data quality route with the corresponding stored data quality of the route and to calculate the amount of kachestva route is used to adjust the transmission power when transmitting data station, which passed the data quality of the route.

The correction factor for the quality of the route may be calculated by obtaining the rate of change of data from multiple computing the correction factor for the quality of the route.

The rate of change of the data can be used to adjust the transmit power previously when transmitting data station that the magnitude of the correction quality of the route which reveals the time-varying.

The method may include the control of the station, transmitting data, background noise/interference in the station receiving data transmission, and regulation of the output power of the transmitting station, transmitting data to the receiving station, thereby to maintain the desired relationship of signal to noise ratio in the receiving station.

The method may include regulating the speed of message data transmitted from the first station to the second station, in accordance with the magnitude of the transmission power set at the first station, and the required signal-to-noise ratio in the second station.

The method may also include the regulation of the length of the data packets of the message transmitted from the first station to the second station, in accordance with the magnitude of the transmission power, ostanovitye controls the transmission of other stations to obtain the quality of the route data and background noise/interference from them, so the first station that controls the transmission from the second station within the range of the first station to the third station is outside the range of the first station may receive the route data and background noise/interference related to the third station.

The method preferably includes selecting a suitable way station for transmitting data in accordance with the data quality of the route and/or data of background noise/interference associated with her.

Additionally, in accordance with the invention, is provided a communication device that can operate as a station in a network that contains a lot of stations that can send and receive data from each other, and the communication device includes: a transmitter means adapted to transmit data to the selected station; means receiver adapted to receive data transmitted from other stations; a means of measuring the intensity of the signal for measuring the power of a received transmission; a processor to write data quality of the route corresponding to the route associated with other stations; and
management tool for regulating the output power of the transmitter, in accordance with the quality of the route between the device and the station is eating data in the received transmission, related to their transmit power, and/or previously measured quality of the route, with measurements made by means of measuring the intensity of the signal.

The processor is preferably adapted to control at least one of the characteristics of the channel between the device and the other stations: the lost route, distortion, phase, time delay, Doppler shift and multi-path fading.

The processor is preferably adapted to extract data quality route from the received transmission to compare the data quality of the route with the measured power of the received transmission and to calculate the correction factor for the quality of the route from the difference and the correction factor for the quality of the route is used by a management tool to regulate the output power of the transmitter.

The processor may be adapted to obtain the rate of change of data from multiple computing the correction factor for the quality of the route, thereby to compensate for changes in the quality of the route between stations.

The processor is preferably adapted to use the rate of change data for controlling the transmission power pre-pramanam.

Preferably the processor is adapted for storing data quality route for each of a large number of stations and to set the initial value of the transmission power when initializing a connection with any of the mentioned multiple stations, in accordance with the relevant stored data quality route.

The processor is preferably adapted to control transmission of other stations to receive data from the quality of the route data and background noise/interference, so that the device can choose a suitable way another station to transmit data, in accordance with the data quality of the route and/or data of background noise/interference associated with her.

Brief description of drawings
Fig. 1 is a schematic diagram multistation communication network, showing how the source station may transmit data through many intermediate station to a destination station;
Fig. 2A - 2E contain together a simplified block diagram showing graphically the operation of the method of the invention;
Fig. 3 - 6 is a principal block diagram of a device suitable for implementing the invention;
Fig. 7 to 9 are block diagrams depicting processes of adaptation capacity, coroama schematically in Fig. 1, contains a number of stations, and each contains a transceiver that can receive and transmit data from any other station within range. The communication network of this type is described in international patent application WO 96/19887, the content of which is included in the present description by reference. The network stations are in contact with each other, using the sensing methodology described in the international patent application PCT/GB 98/01651, the contents of which are also included in the present description by reference.

Although the method and apparatus of the present invention were developed for use in the above-mentioned communication network, it should be understood that the application of the present invention is not limited to such a network and can be used in other networks, including traditional cell or a star network, or even bi-directional communication between the first and second stations.

In Fig. 1 the source station And the ability to communicate with five "nearby" stations b through F and transmits the data to the station Of destination through intermediate stations, I and M

When any of the stations transmit data to any other station, it is necessary that the transmit power being the same time, to eliminate unnecessary power consumption and interference with other stations in the network or, more generally, other communication systems, it is desirable to minimize the used transmit power.

The problem of setting the optimal transmit power is complicated by changes in the quality of the route between the stations, which can be severe in the case of stations that move relative to each other.

In this description, the term "route" includes the loss of the route (also referred to specialists in the field of technology as the transmission loss or attenuation of the route), which is a measure of the power loss during signal transmission from one point to another through a particular environment. However, the expression also includes other parameters of the transmission path between any two stations, as for example, features: phase distortion, the distribution of the time delay, Doppler shift and multi-path fading, which could affect the transmit power required for successful transmission between any two stations.

The present invention addresses this problem by providing a method and device for continuous monitoring of the quality of the route between stations and regulation of ispolzovanie successful reception of the transmitted data, without transmission at higher power than required. In addition, other parameters, such as alignment and coding applied to the transmitted signals can be adjusted to improve the probability of successful transmission.

When the station receives the data packet from the remote station, it measures the power or intensity of the received transmission. This is known as the indicator of the intensity of the received signal (PIP) accept the transfer. In the data packet from the remote station includes data corresponding to the transmit power used by the remote station. The local station can therefore calculate the loss of the route (i.e., the transmission loss or attenuation of the route between two stations by subtracting the locally measured value of a PIP from a value of transmission power in any data packet. Whenever a local station responds to a signal sensed from a remote station, it will always show the loss of the route that it has calculated in response to the data packet. Local station knows that any data packets addressed to itself, will contain data corresponding to the loss of the route, measured by the remote station from the most recent si is to compare its calculated loss of route data loss route, adopted from the remote station, and to use the difference in the values of the loss of the route to determine the correction factor to be used when sending data to the remote station, thus adapting its output power at an optimal level, or as close as possible to him.

The first time when the local station receives a message from a remote station, it will use the correction factor:
routecor= remote loss of the route - local loss of the route
After that:
routecor= routecor+ ((remote loss of the route - local loss of route + routecor)/2) - routecor),
where the maximum regulation performed for routecorin both cases is 5 dB up or down.

routecorcan be a maximum of30 decibels.

Local station adds the correction factor routecorwith his measured by the loss of the route, thereby generating the amount of adjusted loss route when determining how much power to use when responding to the remote station. However, the magnitude of the loss of the route, which she puts in the packet header is the C remote station after ten passes, then it should increase its value routecor5 decibels up to a maximum of +10 dB. The reason for doing this is the exception dropping below the noise threshold, the remote station. (The value of the routecorformed with the measured routecor. Adjusted loss route is then used to determine the required transmit power. A smaller value for the routecorwill correspond to a lower transmit power. Therefore, if the magnitude routecoris too small or even negative, then the transmit power may be too low to reach the remote station. Therefore, it is necessary to increase the value of the routecorlevels 5 decibels until then, until you find the answer from the remote station).

The local station will not increase its transmit power by more than 10 decibels higher than normal. This is to avoid entrainment of other stations, if there is an error with the receiver of the remote station. However, if the local station does not receive a response, then the maximum adjustment can be carried out at 30 decibels higher than normal.

If the PIP remote station is supported on one is to make any adjustments to your correction factor for the quality of the route, if either the remote loss of the route header is zero, or if the local PIP is maintained at the same level.

Calculating the loss of the route and the correction factor routecorlocal stations can now determine the power required for transmission back to the remote station. The remote station also includes in each packet it sends, the magnitude of the background PIP for the current, previous and next modem. The local station will use an adjusted loss of the route and size of the remote background a PIP to determine how much power to use in the response.

Each station has a minimum level of the signal-to-noise (s/n), it will try to maintain for each modem. It is assumed that the desired signal-to-noise of all stations in the network is the same. The local station will set the level of power for their gear so that the remote station will accept them with the right attitude C/W. If the local station has more data to send, or if it can work with a higher data rate, then it is required that the desired ratio could change.

An example is the er route the remote station: - 140 decibels
The required s/n local station: - 25 dB
The loss of route local station: - 130 dB
routecor= remote loss of the route - local loss of the route (for example, for the first time)
= 140-130
= 10 decibels
Adjusted loss route = local loss of route + routecor
= 130+10
= 140 dB
Local power TRANS.x = the remote PIP + required s/n + adjusted loss route
= -120+25+140
= 45 decibels m
From the above example you can see that the local station must use the power of the Pen.x 45 decibels m to obtain remote ratio of 25 decibels. If the local station can establish their power only by steps of 10 dB, then it should adjust its capacity to the next step, i.e., 50 decibel meters

The process of adaptation capacity, described above, is summarized graphically in the flowchart of Fig. 7.

The station may have one or more modems. Each modem works with a different data rate. However, they all work in the same channel, i.e., frequency and/or the environment. Therefore, when the station changes the channels, all modems will be available on the new channel, But the channel may have a minimum and/or Maxine may not use velocity data below, than 80 Kbit/s. Therefore, it cannot use the modem 8 Kbit/s on this channel. In the same way the probing channel 8 Kbit/s can have a maximum bandwidth of 80 Kbps, therefore not allowing you to use the modem 800 Kbit/sec on this channel.

When the station probes on the probe channel, it will use the speed data associated with this channel. She will always probe on this channel and power required to maintain 5 neighbors.

When the local station is responsible for sensing the remote station, or if it responds to the packet data of the remote station, it will always use the best modem for your reply.

The station will always try to answer with the highest possible data rate. The highest data rate will be determined by the maximum data rate allowed for the channel, and the remote ratio on the modem associated with the data rate.

If the station can use a higher data rate on the channel, it will determine remote s/W for this data rate. If it can achieve this desired ratio, it will use a higher data rate. On the other is going to be to stay with the current data rate. When the condition is very bad and the station cannot support the current data rate, it may even choose the answer with a lower data rate, if you allow the channel. She will only use a lower data rate achieved if the ratio is lower speed data. If the station cannot use a lower data rate and if it is at the lowest available speed data, then the station will try anyway. However, if a lower data rate is available, but the station cannot use it on the current channel, then the station will not respond to the remote station. This will cause the remote station to look for a channel with a lower data rate.

Summary
The station will switch to the next modem, if the ratio of the next modem responds with the desired ratio and the maximum modem speed channel, you can use the following modem.

The station will switch to the previous modem, if the ratio of the current modem below the desired ratio and the ratio of the previous modem responds with the desired ratio and the minimum modem speed channel, you can use the previous m>/p>When the station is responsible for another station, it will always try to send as much data as it can. Factors that limit the size of the package, are the intervals between soundings, maximum transmit power and the allowable length of transmission on the data channel.

In the model the basic packet size is 127 bytes. This is the smallest packet size that will allow to reliably transfer data between two stations. (This assumes that you have sent the data. If the station has not sent data, then the package will be always less than 127 bytes).

The station will use the basic packet size in very poor conditions, even when she has more sent data. Thus, if it sends to the remote station that has a bad background noise or is very far away, it will be able only to respond with the lowest data rate (8 Kbps) and with maximum power.

If the station can reach remote ratio better than the baseline value (i.e., the required s/n for 8 Kbit/sec), it can start using large packets on the basis of the following equations.

To increase the speed 10x baud it will annotator> To increase the s/n 10 dB to multiply the size of the package on the Y-axis (usually Y=2).

The multiplier for the size of the package = YW/10, where W is available With additional/W.

The values for Z and Y are constant for the entire network.

Typically, the values for Z and Y is equal to 4 and 2 respectively.

Example 2
If the station can respond with 80 Kbit/s at the required ratio to 80 Kbit/sec, it will then use the minimum packet size is 1274log(80000/8000)=1274=508 bytes. If the station is unable to complete the package, it will still use the power required to achieve the desired relationship With/W.

Example 3
If the station can respond to 15 decibels above the required ratio to 80 Kbit/sec, it will then use a packet size of 1274log(80000/8000)215/10= 12742,83= 1437 bytes. If the station is unable to complete the package, it will reduce its transmit power up to the level required for a packet size that it actually uses. For example, even if she could not use the packet size 1437 bytes, if it only has 600 bytes to send in drawimage s/n, the use of inversion of the equation YW/10to determine how much extra power it needs above the required relationship With/W.

It is important to note that even if the station can use a larger packet size based on the available ratio and data rate, the packet size may be limited by the sensing interval. For example, if the interval sensing on channel 8 Kbit/s is equal to 300 milliseconds and the maximum packet size based on the available ratio is 600 bytes (which converts 600 milliseconds at 8 Kbit/sec), you can see that should be used, the packet size is less than 300 bytes, otherwise other stations can spoil the package when they probe.

A number of factors must be taken into account when trying to determine the maximum packet size based on the speed sensing. These factors include: the delay Lane.x (time for a power amplifier in order for the remote receiver to set in order), learning delay modem (the length of the training sequence modem), delay the turnaround time (the time for the processor to switch from PR.x in Lane.x, i.e., for data processing) and the propagation delay (the time for p the Finance uses the following equation:
maximum length (MS) = interval sensing - delay Lane.x - training sequence modem propagation delay.

The length in bytes can then be defined:
maximum length (bytes) = data rate/8the maximum length (in seconds).

Example 4
The sensing interval is 300 milliseconds for channel 8 Kbit/s. Delay Lane.x - 2 milliseconds, a training sequence modem equal to 2 milliseconds, the delay time of turnover - 3 milliseconds, the propagation delay of 8 milliseconds (the worst case for the station, remote 1,200 km).

Maximum length (MS) = interval sensing delay - turn Lane. x - training sequence modem - the time delay of the back - propagation delay
= 300-2-2-3-8
= 285 MS
maximum length (bytes) = data rate/8maximum length (seconds)
= 8000/80,285
= 285 bytes
The process of adapting the size of the package described above is summarized graphically in the flowchart of Fig. 9.

The table details the format of packets sensing and data used in the network of the invention.

Note to table
Preamble
this three symbol synchronization, which is used to detect the beginning of a correct package.

Package size:
This is the full size of the package from the Sync.3 up to and including the CEC (cyclic redundancy code). The maximum packet size allowed on the channel sensing is determined by the speed sensing, i.e., a station cannot send a packet that is longer (measured in time) than the interval between soundings in the channel sensing. The maximum packet size allowed on the data channel is determined by the amount of time in which the station is permitted to remain in the channel data.

Check size:
This is used to check the packet size to avoid any erroneous receptions long package.

Version protocols
It is used to check which version of the Protocol used. If the software could not support a specific version, the package will be ignored.

Type of service:
This determines the type of the sent packet. Another package will immediately follow the current package, if you set the most significant bit.

ID host:
This is the ID of the station to which the package and the
Each packet that is transmitted, is given a new serial number. The room is not used in any way by the Protocol. He just has to provide information for the system engineer. Each time, when the station returns to its original state, the number starts with a random number. This prevents confusion with older packages.

Adaptive power TRANS.x:
The current capacity of the sending station is given as absolute power in decibels m in the range -80 dB m to +70 decibel meters (Field accepts values from -128 dB m to +127 decibels m).

The loss of the route Lane.x:
This quality of the route, as measured at the sending station. Loss route = (remote power TRANS.x - local PIP) of the previous transmission to the receiving station. A value of 0 is used to indicate that the PIP sending station was maintained at the same level. The quality of the route is used as a correction factor in the receiving station due to the fact that the next time the receiving station transmits to the sending station.

Adaptive activity Lane.x:
This level of activity the sending station, measured as: activity = wattstime / (band width castaway configuration of the antenna, used by the sending station. Each of the 255 possible configurations describes a complete system antenna, i.e. an antenna Lane.x, Etc.x.

Adaptive background PIP Lane.x:
This is the current background a PIP in the sending station for a modem that transmits at the moment. It allows for values from -255 to -1 dB m Send the value is the absolute value of the PIP, and the receiving station must multiply the value by -1 to get the correct value in decibels m 0 is used to indicate that the channel is not available or is greater than or equal to 0 dB m 0 decibel meters cannot be used for the purposes of adaptation.

Adaptive background PIP Lane.x - 1:
Same thing as above, except the previous modem.

Adaptive background PIP Lane.x + 1:
Same thing as above, except the modem.

Impulse noise TRANS.x:
The lower 3 bits for the frequency in Hertz pulse, 0 = no, 1, 5, 10, 50, 100, 500 and > 500, and the next 5 bits for the pulse amplitude.

Adaptive activity Etc.x:
If the station has a high level of activity and is influenced by other stations, they will use this field to make active stencil to respond and reduce their activity. If no station does not request such reduction, the active station will slowly begin to increase your activity level. Thus, if the station is in a very remote area, it will support increase your level of activity, trying to generate connectivity. If she is in a very busy area, the other station will maintain its activity at a lower level.

In preferred embodiments of the invention, the station will always try to keep five neighbors, so that other stations would not be required to request that the station reduces its activity. However, a certain feature is provided for cases in which the station can not reduce its capacity or to increase its data rate, and additionally, in addition, they still affect too many other stations.

Adaptive channel Ave.x:
Allows 255 predefined channels. These channels are set for the entire network. Each channel will have a speed sensing associated with it (it can be switched off, which makes it the data channel). Each channel shall have a minimum data rate associated with it. The channels will have certain frequencies Lane.x is o, digital network services integration and so on

The sending station will request that the other station is moved to the data channel (i.e., where the sensing is turned off) when it has more data to send to the receiving station than can match the size of the package, valid for channel sensing.

CEC header:
This is a test of a 16-bit CEC for header data. They are only checked if the CEC of the package fails. It is provided as a means to determine which station has sent the packet. If the CEC package fails, and CEC title passes, the data provided in the header should be used with caution, since the CEC of the header is very simple means of error detection.

Fields adjacent routing, given below, are not included in the CEC header, since they cannot be used until until the CEC of the package.

Flags neighboring routing:
These flags are used to improve routing. They provide additional information about the current station. Current defined bits are:
bit 0 - set if the current station is busy traffic;
bit 1 - set if the animacia;
bit 3 is reserved.

The other bytes of 8 bits could be added if you wanted more flags.

The size of the neighboring data:
The size of the routing data in bytes. This includes the flags of neighboring routing and size of adjacent data (i.e., 3 bytes). The other 4 bytes are added if included box pack neighbouring software. 6 additional bytes are added for each neighbor that is included in the section adjacent data. Update neighbouring software should be included, if you include any of the neighboring data.

Update neighbouring software:
This is the current version of the updated software available in the current station (higher 16 bits of the field), and the available current block number (lower 16 bits of the field).

Neighboring data:
This is the list of neighbors to which the current station has a data routing. Each time the current station accepts the updated routing information for the station, which is better than the data it had, it will update its own data and to include the station in this list in its next sounding. The data section has four field components for each station in the list.

Identifiee United or direct power TRANS.x, required to achieve the station ID of the current station.

Required modem: modem required current station to reach the destination station.

Flags: flags that provide additional routing information to the destination station. Bit 0 - in traffic, bit 1 gateway, bit 3 - certification authority, bit 4 - immediate neighbor. The last bit indicates that the station in the list is an immediate neighbor of the current station.

Package data:
This data package. They are composed of 1 or more segments. The segments can be of any type and can take a start or target for any ID.

CEC:
This is a test of the CEC 32 bits for the whole package. If this CEC fails, the data package is unloaded, however, the header data can still be restored, if passes CEC header.

An improved way
The block diagram of Fig. 2A - 2D depicts the process of measurement and power control and calibration performed in the network of Fig. 1. The original station And measures the intensity of the signal which it receives from station C. in Addition, the station And identifies the station from its header transmission and identifies which station it addresses and what information is ncii, thus, receiving from him the power level that the station used to reach the station that it addresses, as well as its local minimum noise/interference. Station a may then calculate a route from station to station And, using the measured intensity of the signal and the power level of the station Century.

If the station meets the other station, such as station To station And can be read from the header station In its advertised as a route to the station, thereby obtaining information regarding the fluctuations of the qualities of the route between the stations b and C, simply by controlling the transfer station C. in Addition, since the station announces its transmitted power in response to the station together with the loss of the route announced by the station In the station, it is possible for the station And to calculate the minimum level of noise/interference in the station, even if she can't hear the transfer station C.

Using the control transmission station in the station when the station transmits in a station, the quality of the route, the desired power level and the minimum level of noise/interference can be obtained, even if the station is "out of range" station A.

If the station is In the AOR is rebueno quality of the route cannot be obtained from its transmission, not to mention the calculation of the effective quality of the route from a to C. If the station And control station corresponding to the station A, and reads the calculated route to the station And nested in the header station, the station may then compare this calculated route with route read from the station, and calculates the difference. Station And uses the difference to upgrade their average difference in the quality of the route. This is done by comparing the quality of the route, which it calculates, with the quality of the route, which calculates the station, and this difference has as a result of differences in methods of measurement and other errors of the two stations.

However, since there is a fluctuation in the quality of the route between gears, it is possible that the quality of the route is changed from the time when the station was measured as the route from station to station A. Therefore, the rate of change can be calculated over and above the long-term averaging of the difference, which is the result of measurement error. This rate of change will be due to the rate of change of the actual quality of the path from changes in the spread between gears.

Station a may also use the level of W is navalnogo at the last entries in the station, as well as rapid fluctuations, which can be a minimum level of noise/interference Century Station And can then use the predicted fluctuations in the quality of the route from station a to station b and predictable fluctuations in the rate of change of the noise/interference, in order to predict the ability to pass at station C. This is done to choose the periods of minimum quality of a route or a minimum level of noise between stations a and B. Since the station And collects data from other stations, for example stations b, C, D and F, it can decide does the station In the best possible or should it choose one of the other stations. In addition, it can choose its data rate, duration of service and the power of the transmitter based on the rate and duration of fluctuations in the quality of the route and noise/interference that exist between stations a and B.

If station a selects a station to transmit data to it, she receives a confirmation back from the station, and this information is then sent from the station In a suitable way in the other stations. It is important to note that when the control gear from station To station And also has an idea about the quality of the route from the station in staat fluctuations in the quality of the route between the station and other stations and an indication of the fluctuations of the minimum level of noise/interference to other stations, even if these other stations are not controlled directly by station A. Using this method, can be selected suitable station transfer, taking into account not only the first shipment, and the two of shipment and, subject to the availability of General information routing, data can be routed efficiently to the destination station O.

Hardware
Fig. 3, 4, 5 and 6 depict the main hardware used to implement the invention. These figures correspond to figs. 8, 9, 10 and 11 of the above-mentioned international patent application WO 96/19887.

On the basis of their "solutions" to convey the main processor 149 will decide about the use of power level, data rate, and duration of the packet and send the packet to the serial controller 131 and simultaneously via the peripheral interface 147 will switch switch 103 transmit/receive mode of transmission and the transmitter after the appropriate delay. Chip 131 Zilog will send the data packet together with the appropriate header and checking the CEC through the encoders sequence pseudocode in block 128 or 130, depending on the selected data rate.

The main processor 149 insert into the data packet as odnogolosy power transmission, which was sent in block 132 software management interrupt (PMU) power control, which, in turn, is used to start the circuit 141 of the power control, which, in turn, controls the block 143 of the control gain and lowpass filter. This block, in turn, uses feedback from the amplifier 145 power to control the triggering devices 144 and 142.

The way of perception and feedback gain allows to obtain acceptably accurate power level on the basis of commands from the circuit 141 of the power control.

Before turning on the power amplifier, the transmission frequency is selected by the synthesizer 138, after which the amplifier 145 power is given to the team through the block 141 of the launching device and the power amplifier is enabled.

If the required power levels below the minimum level of power provided by the amplifier 145 power unit 102 switchable attenuator 102 may be enabled to provide up to 40 dB of additional attenuation. Thus, the processor can instruct the power amplifier to enable the combination of the attenuator to provide output power in the range from minus 40 decibels m to + 50 decibels of mine forward and reverse power, which is sent through an analog-to-digital Converter 146 and is used by the main processor 149 in order to control the transmitted power level. This information is then stored in the dynamic PPD (random-access memory) 150 to provide information relative to the forward and reverse power levels actually generated when compared with the requested level.

The magnitude of the output power of the transmission will affect the efficiency control loop the transmit power (blocks 145, 144, 142 and 143) and the block 102 switchable attenuator. In addition, any mismatch in the antenna 100 will also be as a result of changes in the reflected and forward power. Relative power actually output for different required levels, can be remembered by the processor in TTD, providing a table giving the requested relative to the actual power output levels. This can be used to allow the processor to use the more accurate power level in the information he provides regarding future transmission within the message signal sensing. Since the power level varies between minus 40 dB m to + 50 deze can be transmitted. Thus, the table stored by the processor, will have these ten power levels with the requested power level and the actual power level in the range.

Any other station in the network will then make the transfer through its antenna 100. The received signal will then pass through the circuit 101 perception of low power and switchable attenuator 102, which is initially set to attenuation 0 dB. He will then pass through the bandpass filter 104 2MHz, which will remove the obstacle of the band, and then passes in the pre-amplifier 105, which amplifies the signal before it is mixed with decreasing frequency through the mixer 106 in the intermediate frequency signal of 10.7 MHz. This signal is filtered by bandpass filter 107 and is amplified in the amplifier 108 intermediate frequency and optionally filtered and amplified in blocks 109, 110, 111 and 112.

Final filtration occurs in blocks 114 and 115, at this stage, the signal is measured in block 116, using narrowband function PIP, the output of which is used by the main processor to determine the signal strength of the incoming transmission. This then allows the processor, if necessary, to request the additional attenuation will be required only, if the signal exceeds the measurement range NE615 block 116. Otherwise, the attenuator remains on the attenuation of 0 dB, allowing you to be available full sensitivity of the receiver to receive small signals. Incoming transmission is measured in two frequency bands simultaneously, namely 8 kHz and 80 kHz. Bandwidth 80 kHz is measured at the outlet of the intermediate frequency signal of 10.7 MHz after the ceramic filter 109 150 kHz and using ceramic filter 121 160 kHz and an integrated circuit 120 NE604. It also has an exit PIP, which is received via the interface main processor 149.

Broadband and narrowband PIP is measured through an analog-to-digital Converter, which then transmits the data to the main processor 149. The main processor has a viewing table and takes the information from the analog-to-digital Converter and receives from the pre-calibrated data signal intensity of the reception. These data are calibrated in decibels m, usually from minus 140 decibels m to 0 dB m This information is usually generated using the generator output calibrated signal, introducing it into the input of the receiver, and then configure different levels of intensity signal and issuing the command to the processor through the keyboard is eskay TTD or flash TTD 150.

Thus, the receiving station can accurately record the power level of any incoming transmission. It then reads the address of the incoming transmission and inserted power level. A comparison of these, for example, the power level plus 40 decibels m can be measured in the receiver as minus 90 decibel meters, and this is then used to calculate the loss of route 130 decibels. Loss of the route can vary from 0 dB up to a maximum of 190 decibels(+50-(-140)= 190). Minimal loss of the route, which can be measured, depends on the transmission power of the transmitting station and the maximum signal that can be measured by the receiving station. Because of this design the maximum receiving signal is equal to 0 decibel meters in the port 100 of the antenna can be measured loss of route is 0 dB, provided that the transmit power is less than 0 dB m Otherwise, for example, when the transmission power of 50 decibels m minimum loss of the route, which can be measured, equal to 50 decibels. This could be improved by adding additional steps in the switchable attenuator or through the use of another device in the receiver. If the switchable attenuator is fully on and the output from the And the part data, associated with the transfer, as supported at the same level. This means that the loss of the route is less than that which can be measured.

The processor after receiving continuously measure the background signal and noise, and if not detected transmission in any modem any rate, will monitor and measure the noise and interference in decibels m and generate the average value that will be remembered in static TTD. When the detected transfer, the most recent calculation of noise compared to signal intensity to obtain the signal-to-noise ratio. For each transfer is going to background noise before the transfer is declared inside a message transmission or sensing, as another field with a delivered power. Other stations in the network can read and gain from the transfer not only the quality of the route, but also minimum noise level remote station just prior to its transfer. The receiving station, because she knows the quality of the route and has a minimum noise level of the remote station, you will then know what power to transmit to achieve any desired relationship of signal to noise in the remote station.

The desired attitude signal is one and the probability of success. This is the required signal-to-noise ratio is stored in the database processor and continuously updated based on the success of the transfer to various destinations. If the station is, for example, catches the transmission and calculates that the loss of a route is equal to 100 decibels, and the remote station must be declared minimum noise minus 120 decibel meters in order to meet the required signal-to-noise ratio, such as 20 decibels for 8 kilobits per second, it will then transmit at a power level of minus 20 decibels m Is the desired signal-to-noise ratio will be different for 80 kilobits per second is the minimum noise level would be higher in a wider frequency band 150 kHz compared to 15 kHz and due to the fact that the performance of the modem 80 kilobits per second may be different from the performance of the modem 8 kilobits per second.

Thus, the receiving station would know that if, for example, declared the minimum noise level in a wide range equal to minus 110 decibels m, and the loss of the route is equal to 100 decibels, but the desired signal-to-noise ratio is, for example, 15 dB, it would have required transmit power level plus 5 dB (a) m the Station receiving the transfer, will know what level Monetnaya station will see a change in the quality of the route, and also change the minimum level of noise, announced various other stations, which it controls, and by selecting the minimum quality of the route and the minimum noise level will transfer with the appropriate power level to achieve the desired relationship of signal to noise in the station or stations, which it controls. In response to the transmission of the answering station will turn your transmitter will control the power amplifier through the block 132 navel management capacity to meet the desired power level, and then the main processor 149 inserts a field of its own power, its own noise reception before sending it, and the quality of the route that he just got out of the station, in which he is responsible.

Depending on the desired relationship of the signal-to-noise and power level, the main processor will choose to include either the modem 80 kilobits per second, or 8 kilobits per second and transfer. After the transfer, it will insert its own power level, its own minimum level of background noise, measured in both frequency bands 150 kHz and 15 kHz, and the quality of the route, which he had just calculated for transmission, and through the Converter a to D, and using lookup table in the static reservoir pressure, to calculate the intensity of the received signal. In the study of an incoming packet, transmitted from a synchronous serial chip 131 Zilog, it will calculate accept the loss of the route, using the declared power of the transmitter and the measured PIP, and to compare the magnitude of the loss of the route, send it to other stations.

When comparing these two losses route, because only a short period of time has passed between transmission and reception, these two losses route should be almost identical, if the loss of the route does not fluctuates, what is called, possibly surrounded by a moving vehicle. Upon successful transmission, the difference between the two values loss route is averaged and stored, because this number represents the difference due to measurement errors of the signal intensity or errors in the transmitted declared power level. The averaging process is used to calculate the average value of, say, the effects of a moving vehicle and fluctuations in the loss of the route. The main processor will use this average number, and save one for each station in the network. He will have coefficiency in the network, he will remember in the RPE. After the discovery of some stations, transmitting and measuring the loss of the route, the correction factor is then used to adjust the power level before responding to the station, i.e. predictable. A typical process is as follows.

Station And measures included the loss of the route from the station In, say, 100 decibels. Station And searches for the address of the station, which then compares with the screening table to determine the correction factor, or Delta, for example, plus 10 decibels. This means that the loss of the route, as measured by station And by an average of 10 decibels higher than the loss of the route, measured by station C. On the basis of the loss of the route, just measured by station a, and the noise of the station, the desired power level is calculated by the station And to meet the desired relationship of signal to noise in the station C. the Difference allowed between the declared loss of route station and the measured loss of the route station And memorized station A. If there is a strong change, this is likely due to fluctuations in the loss of the route between the transmission and, therefore, the intensity of the signal is used to determine the loss Mar what about the numbers which for some gear will be averaged to account for any fluctuations in the loss of the route between transmission and reply.

To have a Delta number is also useful, because after hearing the station, probing or communicate with any other station, the loss of a route can be calculated using the correction factor, and can be estimated required transmit power to use for reaching the remote station with sufficient signal-to-noise ratio. Delta loss of the route or the correction factor is updated only when stations interact with each other, and this field will only be present during transmission, when the station answers the other, and will not be present when the other station is just probes when this field is empty.

Although embodiments of the invention described above with special reference to the loss measurement route in the sense of weakening route or transmission loss, it will be clear that additional quality parameters of the route, such as route parameters mentioned above can be measured to provide a more accurate value quality route for use in the regulation of the power used when transmitting data between the mill is notesto stations, able to send and receive data from each other, and the way exercise control in each station the quality of the route between the station and each other station, which connects this station; the entry in each station data quality of the route corresponding to the route associated with each referred to the other station; installation in each station of the magnitude of the transmission power based on the recording quality of the route associated with the selected other station, when transmitting data in said selected another station, thus to increase the likelihood of the data in said selected another station at the optimum power level; and transmit the data quality of the route corresponding to the route between the first and second station, when the transmission of other data between stations, so that the data quality of the route recorded in the first station, transmitting a second station for use by the second station and Vice versa, characterized in that each station comprises data local background noise/interference in at least some of their gear in the other stations, for use by other stations in the regulation of their power values of the transmission when s is installed, background noise/interference to the second station, receiving the transmission data, and regulate the amount of power transfer station, transmitting data to the receiving station, and maintain the required signal-to-noise ratio in the receiving station.

2. The method according to p. 1, in which the quality control of the route between the stations includes monitoring at least one of the characteristics of the channel between stations: the lost route, distortion, phase, time delay, Doppler shift and multi-path fading.

3. The method according to p. 1 or 2, in which the quality of the route, the station receiving the transfer data is determined by comparing the measured power of a received transmission data in the transmission, indicating its transmit power.

4. The method according to p. 3, in which the station receiving such data quality route, compares the received data quality route with the corresponding stored data quality of the route and calculates the correction value of the quality of the route from the difference between the received and the stored values, and the correction quality of the route used to adjust the transmission power when transmitting data station that transmitted the data quality of the route.

5. The method according to p. 4, to the calculation of the correction factor for the quality of the route.

6. The method according to p. 5, in which the rate of change of the data used to regulate power transfer previously when transmitting data station, the correction quality of the route which reveals the time-varying.

7. The method according to any of paragraphs. 1-6, in which each station controls the transmission of other stations to receive data from the quality of the route, so the first station for controlling transmission from the second station within the range of the first station to the third station is outside the range of the first station receives the data quality of a route related to the third station.

8. The method according to any of paragraphs. 1-7, in which the speed control data messages transmitted from the first station to the second station, in accordance with the magnitude of the transmission power set at the first station, and the required signal-to-noise ratio in the second station.

9. The method according to any of paragraphs. 1-8, in which the regulation of the length of the data packets of the message transmitted from the first station to the second station, in accordance with the magnitude of the transmission power set at the first station, and the required signal-to-noise ratio in the second station.

10. The method according to any of paragraphs. 1-9, in Kotak that the first station, controlling transmission from the second station within the range of the first station to the third station is outside the range of the first station receives the data of background noise/interference related to the third station.

11. The method according to any of paragraphs. 1-10, with the selection of the appropriate station for transmitting data in accordance with the data quality of the route and/or data of background noise/interference associated with her.

12. A communication device that can operate as a station in a network that contains many stations that transmit and receive data from each other, and the communication device includes: a transmitter means adapted to transmit data to the selected station; means receiver adapted to receive data transmitted from other stations; a means of measuring the intensity of the signal for measuring the power of a received transmission; a processor to calculate and record the data quality of the route corresponding to the route associated with other stations, and a management tool for regulating the output power of the transmitter, in accordance with the quality of the route between the device and the destination station, in which the processor is arranged to include data quality route in their Nations for use in the calculation of the updated data quality route wherein the processor is configured to control data background noise/interference to the transmissions from other stations, so the first station for controlling transmission from the second station within the range of the first station to the third station is outside the range of the first station receives the data of background noise/interference related to the third station.

13. The communication device according to p. 12, in which the processor is configured to calculate the quality of the route by comparing the data in the received transmission relating to power transmission, and/or previously measured quality route with measurements made by means of measuring the intensity of the signal.

14. The communication device under item 13, in which the processor is configured to control at least one of the characteristics of the channel between the device and the other stations: the lost route, distortion, phase, time delay, Doppler shift and multi-path fading.

15. The communication device under item 13 or 14, in which the processor is arranged to extract data quality route from the received transmission to compare the data quality of the route with the measured power of the received transmission and to calculate the correction factor for the quality of the route is regulirovaniya output power of the transmitter.

16. The communication device under item 15, in which the processor is arranged to obtain the rate of change of data from multiple computing the correction factor for the quality of the route and compensate for changes in the quality of the route between stations.

17. The communication device according to p. 16 in which the processor is arranged to use the rate of change data for controlling the transmission power in advance upon the data transfer station, the correction quality of the route which reveals changes over time.

18. The communication device according to any one of paragraphs. 12-17, in which the processor is configured to control the data quality of the route in the transmission from other stations, so the first station for controlling transmission from the second station within the range of the first station to the third station is outside the range of the first station receives the data quality of a route related to the third station.

19. The communication device according to any one of paragraphs. 16-18, in which the processor is made with the possibility of storing data quality route for each of a large number of stations and installation initial value of the transmission power when initializing a connection with any of the mentioned multiple stations, in accordance with the CE the quarrels made with a choice of a suitable way to the other station to send data to it, in accordance with the data quality of the route and/or data of background noise/interference and related.

 

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Radio receiver // 2210859
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FIELD: radio engineering; construction of radio communication, radio navigation, and control systems using broadband signals.

SUBSTANCE: proposed device depends for its operation on comparison of read-out signal with two thresholds, probability of exceeding these thresholds being enhanced during search interval with the result that search is continued. This broadband signal search device has linear part 1, matched filter 2, clock generator 19, channel selection control unit 13, inverter 12, fourth adder 15, two detectors 8, 17, two threshold comparison units 9, 18, NOT gates 16, as well as AND gate 14. Matched filter has pre-filter 3, delay line 4, n attenuators, n phase shifters, and three adders 7, 10, 11.

EFFECT: enhanced noise immunity under structural noise impact.

1 cl, 3 dwg

FIELD: radio engineering for radio communications and radar systems.

SUBSTANCE: proposed automatically tunable band filter has series-connected limiting amplifier 1, tunable band filter 2 in the form of first series-tuned circuit with capacitor whose value varies depending on voltage applied to control input, first buffer amplifier 3, parametric correcting unit 4 in the form of second series-tuned circuit incorporating variable capacitor, second buffer amplifier 5, first differential unit 6, first amplitude detector 7, first integrating device 9, and subtraction unit 9. Inverting input of subtraction unit 9 is connected to reference-voltage generator 10 and output, to control input of variable capacitors 2 and 4. Automatically tunable band filter also has series-connected second amplitude detector 11, second integrating unit 12, and threshold unit 13. Synchronous operation of this filter during reception and processing of finite-length radio pulses is ensured by synchronizer 14 whose output is connected to units 10, 8, and 12. This automatically tunable band filter also has second differential unit whose input is connected to output of buffer amplifier 3 and output, to second control input of variable capacitor of band filter 2.

EFFECT: enhanced noise immunity due to maintaining device characteristics within wide frequency range.

1 cl, 1 dwg

FIELD: radio communications engineering; mobile ground- and satellite-based communication systems.

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EFFECT: enlarged functional capabilities.

1 cl, 15 dwg

FIELD: electronic engineering.

SUBSTANCE: device has data processing circuit, transmitter, commutation unit, endec, receiver, computation unit, and control unit.

EFFECT: high reliability in transmitting data via radio channel.

4 dwg

FIELD: electronic engineering.

SUBSTANCE: method involves building unipolar pulses on each current modulating continuous information signal reading of or on each pulse or some continuous pulse sequence of modulating continuous information code group. The number of pulses, their duration, amplitude and time relations are selected from permissible approximation error of given spectral value and formed sequence parameters are modulated.

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16 cl, 8 dwg

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EFFECT: reduced power requirement at low noise characteristics.

45 cl, 3 dwg

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EFFECT: facilitated realization of narrow-band noise suppression unit; simplified design of rejection filters.

1 cl, 8 dwg

FIELD: mobile radio communication systems.

SUBSTANCE: proposed method and device are intended to control transmission power levels for plurality of various data streams transferred from at least one base station to mobile one in mobile radio communication system. First and second data streams are transmitted from base station and received by mobile station. Power-control instruction stream is generated in mobile station in compliance with first or second data stream received. Power control signal is shaped in mobile station from first power control instruction stream and transferred to base station. Received power control instruction stream is produced from power control signal received by base station; power transmission levels of first and second data streams coming from base station are controlled in compliance with power control instruction stream received. In this way control is effected of transmission power levels of first data stream transferred from each base station out of first active set to mobile station and of transmission power levels of second data stream which is transferred from each base station out of second active set to mobile station.

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80 cl, 21 dwg

FIELD: radio engineering.

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13 cl, 9 dwg

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3 cl, 1 dwg

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