RU2704108C1  Method for adaptive power control in a radio line with linear prediction of the second order of interference power value  Google Patents
Method for adaptive power control in a radio line with linear prediction of the second order of interference power value Download PDFInfo
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 RU2704108C1 RU2704108C1 RU2019113941A RU2019113941A RU2704108C1 RU 2704108 C1 RU2704108 C1 RU 2704108C1 RU 2019113941 A RU2019113941 A RU 2019113941A RU 2019113941 A RU2019113941 A RU 2019113941A RU 2704108 C1 RU2704108 C1 RU 2704108C1
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The proposed method relates to the field of communication and can be used in information transfer systems.
The wellknown “Repeater controlling the power of the reverse link” (patent RU 2300839, H04B 7/005, 7/26, H04J 13/00, H04Q 7/38). The disadvantage of this method is the lack of efficiency when operating communications in a rapidly changing interference environment.
The wellknown "Method of measuring the signaltonoise ratio (SNR) for a CDMA mobile communication system" comprising measuring the interference power of a singlechannel signal after passing through a received singlechannel demodulation signal in a multichannel receiving device on the receiving side, performing equipartic summation of the measured interference power of singlechannel signals to obtain the total interference power , measurement of signal power after diversification summation of singlechannel signals, obtaining the measured SNR by dividing m signal sensitivity to the total interference power (application RU 2003107679, H04J 13/00). The disadvantage of this method is the insufficiently high efficiency when operating communications in a rapidly changing interference environment in a singlechannel mode.
A device for estimating noise in a communication system comprising a correlation device for correlating a plurality of subcarriers with a reference sequence on an elementbyelement basis and outputting a correlation result, and a signal noise calculating device for calculating a difference between a correlation value associated with each of a plurality of subcarriers, and the correlation value obtained from at least one adjacent subcarrier derived using the correlation device (application RU 2005133437, H04J 11/00). The disadvantage of this method is the high complexity of the device and the insufficiently high accuracy of the noise estimate in the presence of a signal.
The wellknown "Method of power control in a radio communication system" (application RU 2002133457, H04B 7/005). The disadvantage of this method is the lack of efficiency when operating communications in a rapidly changing interference environment.
A known method of controlling power by using gnss signals (patent RU 2542328, H04W 52/18). The disadvantage of this method is the lack of efficiency when operating communications in a rapidly changing interference environment.
A known method of controlling the transmit power in a wireless LAN, controller and access point (patent RU 2562250, H04W 52/24). The disadvantage of this method is the lack of efficiency when operating communications in a rapidly changing interference environment.
A known method of controlling the power of transmitters of mobile (MS) and base (BTS) stations (closed loop control  Closed Loop Control) (described in WWW.2fcmd.ru (book_09 / h9_2)), which consists in the following. The network gives the MS command to set the transmitter power, based on the measurement results of the signal level at the input of the BTS receiver, the necessary transmitter power level is determined in BTS. The disadvantage of this method is the low efficiency when operating communications in a rapidly changing interference environment.
The known "Device and method for controlling the initial transmit power of a direct communication channel in a communication system with mobile objects" (application RU 2000108489, H04B 7/26), which contains the steps of measuring in a mobile station the signal strength of a given direct communication channel received from the base station, sending information indicating the power of the specified direct communication channel to the base station, determining in the base station the initial transmission power for the given direct communication channel based on information received from the mobile station, and using Nia determined transmission power for controlling an initial transmission power for the other forward link channel. " The disadvantage of this method is the lack of efficiency when operating communications in a rapidly changing interference environment.
The closest analogue in technical essence to the proposed one is “A method for controlling the power of signals emitted by a transmitting device associated with a corresponding receiving station in a digital cellular radio system, according to the application RU 95108874, H04B 7/26, p. 1, adopted as a prototype.
A method for controlling the power of signals emitted by a transmitting device associated with a corresponding receiving station in a digital cellular radio system includes the following steps:
(a) calculating the attenuation of the signal along the propagation path between the transmitting device and the corresponding receiving station;
(b) measurement of the interference power level at the respective receiving station;
(c) calculating the product of the reciprocal of the attenuation on the propagation path of the said interference power level and a fixed value that corresponds to the minimum assigned value of the ratio of the carrier power of the received signal to the interference power;
(d) adjusting the power of the signals emitted by the transmitting device in accordance with the value of said product;
(e) repeated repetition of steps (a), (b), (c) and (d), and the time interval between successful executions of the step of regulating the signal power varies.
The disadvantage of the prototype method is the unwarranted quality of information transfer in a rapidly changing interference environment.
The task is to increase the likelihood of information transfer in a rapidly changing interference environment.
To solve the problem in the method of adaptive power control in a radio line with linear prediction of the second order of the value of the interference power, including the following steps:
 measurement of signal power level and interference power level at the respective receiving station;
 regulation of the power of the signals emitted by the transmitting device;
 repeated repetition of these steps;
using a fixed value that corresponds to the minimum assigned value of the ratio of the carrier power of the received signal to the interference power;
transmit power control data from the corresponding receiving station to the transmitting device;
calculations are performed at the corresponding receiving station;
adjusting the power of the signals emitted by the transmitting device includes the operation of setting the power of the signal emitted by the transmitting device, which includes the following:
 setting the power of the signals emitted by the transmitting device, if its value is less than the maximum allowable power and more than the minimum allowable power;
 setting the power of the signals emitted by the transmitting device equal to said maximum allowable power if said product is greater than or equal to said power;
 setting the power of the signals emitted by the transmitter to be equal to said minimum allowable power, if the power is less than or equal to said minimum allowable power;
the transmission and reception of information is carried out at fixed frequencies or at different frequencies when using the tuning of the working frequency, including pseudorandom tuning of the working frequency (MFC), according to the invention,
information is exchanged in a pointtopoint communication line (transmitting device (station No. 1)  receiving station (station No. 2) in the time division of channels, the operation of each station consists of time cycles, each cycle consists of an information transmission interval and an interval information reception for station No. 1, information reception interval and information transmission interval for station No. 2,
information exchange is carried out in two stages:
station No. 1 in the first time cycle transmits information or a pilot signal to station No. 2 with maximum power,
at station No. 2, when receiving information, after measuring the signal and interference powers, their ratio is calculated (the current value of the signaltonoise ratio (SIR)), and the ratio of a fixed value is calculated that corresponds to the minimum assigned value of the ratio of the carrier power of the received signal to power interference (the minimum allowable ratio of signal power and interference (OOSP)) and SIR, transmit information and the mentioned calculated value with maximum power;
at station No. 1, when receiving information, after measuring the signal and interference powers, their ratio (SIR) is calculated, and the ratio of a fixed value corresponding to the minimum assigned ratio of the received signal carrier power to the interference power (SPS) and SIR is calculated, information is transmitted and said calculated value with maximum power;
in the second time cycle in each station after receiving information, in addition to the above operations, calculate the value of the output power of the signal by multiplying the value of the output power with which the information (current value) was transmitted before by the received value of the OOSP and OSP ratio and by the correction factor, the value which is determined in advance, set the transmitter power equal to the calculated value,
at the stage of information exchange with adaptive power control:
in each station, assign the value 0 to the number of the information reception interval and store it;
in the first time cycle, in the information transmission interval, station No. 1 (No. 2) transmits information and the value of the OOSP and OSP relations with the installed power calculated in the previous information exchange cycle;
in the first time cycle in station No. 1 (No. 2) in the interval of information reception:
after measuring the signal power and interference, their ratio (SIR) is calculated, and also the ratio of the SIR and SIR values is calculated;
calculate the value of the output power of the signal by multiplying the current value of the output power by the received value of the ratio of OOSP and OSP and the correction factor;
set the values of the codes of the receipt of information: the code corresponding to the fact of receiving the information is set if the value of the relationship between the OOSP and the OSP is less than one, the code corresponding to the fact that the information is not accepted, set otherwise;
increase the value of the number of the interval for receiving information by 1 and remember it;
starting from the first information reception interval, the difference between the interference power values measured at the current moment and at the time of the previous reception is calculated, if this value exceeds a predetermined threshold, then the interference power value for the next moment of information reception is estimated using the secondorder linear prediction method, otherwise case, as the value of the interference power for the next moment of reception using the current measured value of the interference power,
starting from the second time cycle:
in each station, in addition to the operations mentioned, they analyze the receipt code for receiving (not receiving) information, if a code message is received that the information has been received, the calculated transmitter power value is set in the stations;
otherwise, in the next time cycle, information on the receipt of which confirmation is not received is retransmitted with the power, the value of which is calculated by multiplying its current value by the power increase coefficient, the value of which is set in advance;
Further work continues according to the described procedure.
The proposed method is as follows.
The work of each station consists of time cycles, each cycle consists of an information transmission interval and an information reception interval for station No. 1 and an information reception interval and an information transmission interval for station No. 2 (see Fig. 1).
Information exchange is carried out in two stages: the initial stage and the information exchange stage with adaptive power control.
At the initial stage, station No. 1 transmits information with maximum power, for example, in the form of a pilot signal.
In station No. 2 after measuring the signal power and interference, calculate their ratio (the current value of the ratio of signal power and interference (SIR)). They also calculate the value of the ratio of a fixed value, which corresponds to the minimum assigned value of the ratio of the carrier power of the received signal to the interference power (the minimum allowable ratio of signal power and interference (OOSP)), and OSP.
The information and said calculated value are transmitted with maximum power.
In station No. 1, after measuring the signal power and interference, calculate their ratio (SIR), and also calculate the ratio of the values of SIR and SIR.
The value of the output power of the signal is calculated by multiplying the value of the output power with which the information (current value) was transmitted before this by the received value of the OOSP and OSP ratio and by a correction factor, the value of which is determined in advance
P _{rprd} = P _{tprd} K _{to} q _{o} / q _{t} (1)
where: P _{TPD}  the current value of the output power of the signal;
K _{to}  correction factor;
q _{about} , q _{t}  the minimum allowable and current values of the ratio of signal power and interference, respectively.
The correction factor takes into account a possible change in the signal power, for example, due to frequency instability, other factors, for example, a change in the directional coefficient of the antenna due to atmospheric factors, etc., as well as due to measurement errors of the signal power and interference.
The value of the correction coefficient is determined experimentally at the stage of testing communications.
Set the transmitter power to the calculated value.
If the calculated value of the transmitter power becomes equal to or greater than the maximum allowable power, or becomes equal to, or less than the minimum allowable transmitter power, then set, respectively, the maximum or minimum power value.
At the stage of information exchange with adaptive power control:
in each station, assign the value 0 to the number of the information reception interval and store it;
in the first cycle, station No. 1 transmits with installed power the information and the calculated value of the OOSP and OSP relations, which was calculated in the previous information exchange cycle,
in the first cycle of station No. 1 and No. 2 in the interval of information reception:
after measuring the signal power and interference, their ratio (SIR) is calculated, and also the ratio of the SIR and SIR values is calculated;
calculate the value of the output power of the signal by multiplying the current value of the output power with which information was previously transmitted by the received value of the ratio of OOSP and OSP and the correction factor;
set the transmitter power equal to the calculated value;
increase the value of the number of the interval for receiving information by 1 and remember it;
set the value of the receipt code of the information reception: the code corresponding to the fact of receiving the information is set if the value of the OOSP and the OSP ratio is less than one, the code corresponding to the fact that the information is not received is set otherwise.
In the first cycle, station No. 2 in the interval of information transfer:
transmits with installed power information, the calculated value of the OOSP and OSP relations, the value of which was calculated in the previous cycle of information exchange, the receipt code for the reception (not reception) of information.
Starting from the second interval for receiving information at each station, in addition to the above operations, the receipt code for receiving (not receiving) information is analyzed.
If a code message is received that the information has been received, the calculated transmitter power is set at the stations, otherwise, in the next time cycle, information on the receipt of which is not received is retransmitted with the power, the value of which is calculated by multiplying the current power value by the coefficient of increase in power, the value of which is set in advance.
The value of this coefficient is determined by the method of mathematical modeling or experimentally at the stage of testing communications as a value that provides information with a probability of at least a given level, provided that the probability of a false alarm is not higher than a given level.
The difference in the values of the interference power measured at the current moment and at the time of the previous reception is calculated, if this value does not exceed a predetermined threshold, then the current measured value of the interference power is used as an estimate of the value of the interference power for the next moment of reception.
Otherwise, the value of the interference power for the next moment of receiving information is estimated by the secondorder linear prediction method (see, for example, “Digital processing of speech signals. // LR Rabiner, RV Shafer. Translated from English under the editorship of M .V. Nazarova and Yu.N. Prokhorov. Moscow, “Radio and Communications, 1981”, p. 211)
P (n + 1) = a _{1} P (n) + a _{2} P (n1) (2)
where: P (n), P (n1) is the value of the interference power at the current and previous times, respectively;
and _{1} , and _{2} are factors.
The values of these factors are determined by mathematical modeling or experimentally.
Further work continues according to the described algorithm.
Below are the results of evaluating the effectiveness of the proposed method.
The results of evaluating the effectiveness of the proposed method were obtained by mathematical modeling on a computer using the MATLAB system.
When modeling it was accepted that
P _{p} (n) = P _{p} (n1) (1 + pp) (3)
where: R _{p} (n), R _{p} (n1) is the value of the interference power at the current and previous times, respectively;
pp  uniformly distributed random variable in the range
0  R _{m} .
Here P _{m}  the maximum value of the change in the interference power in one step.
That is, the interference power increases randomly.
The approximation of the interference power value was carried out according to the formula (3).
When modeling, the following initial data were used:
the number of implementations  10 ^{3} ;
a _{1} = 2;
and _{2} = 1.
The simulation results are shown in the table.
The table shows the values of the number of cases of loss of information packets (without taking into account their retransmission) for the case of using the adaptive power control method of the output signal of the communication means with linear prediction of the second order interference power and for the case when this algorithm is not used, for various values of the power variation range interference, the number of process steps and the values of the coefficient a _{1} in the linear prediction model of the second order.
The following notation is used in the table:
Npa, Npba  the number of cases of loss of information packets (without taking into account their retransmission) for the case of using the method of adaptive power control of the output signal of communication means with linear prediction of the second order interference power and for the case when this algorithm is not used, respectively.
It should be noted that according to the simulation results it was found that with the value of the parameter P _{m} = 0.8 in 20 steps of the process, the interference power increases on average 1000 times.
According to the results of the analysis of the data given in the table, it can be concluded that when applying the method of adaptive adjustment of the output signal power of communication equipment with linear prediction of the second order interference power, the number of packet loss information can be reduced to almost zero by choosing the appropriate value of the coefficient a _{1} in the secondorder linear prediction model for almost any parameter values determining the increase in the interference power.
The effectiveness of the method, when the adaptive power control of the output signal of communication with linear prediction of the second order of the interference power is not used, is significantly inferior to the effectiveness of the proposed method.
The technical result consists in ensuring the operation of communication facilities with a minimum power with a given level of probability of information loss in a rapidly changing interference environment.
The structural diagram of a device designed to implement the proposed method is shown in FIG. 1, where indicated:
1  antenna;
2  mixer;
3  intermediate frequency amplifier (UPCH);
4  bandpass filter (PF);
5  local oscillator;
6  analogtodigital Converter (ADC);
7  computing device (WU);
8  transmitter;
9  modulator.
The device contains a seriesconnected antenna 1, mixer 2, UPCH 3, bandpass filter 4, ADC 6, VU 7, modulator 9 and transmitter 8, the output of which is connected to the input of antenna 1, the outputinput of which is the outputinput of the device. In this case, the output of the local oscillator 5 is connected to the second input of the mixer 2; the second output of VU 7 is connected to the second input of the transmitter 8, the second inputs of the modulator 9 and VU 7 are combined and are the input of the device.
The device operates as follows.
The signal and interference mixture from the antenna 1 enters the mixer 2, where the signal frequency is lowered or increased to an intermediate frequency value. The resulting mixture of signal and interference is amplified in the amplifier 3, the amplified signal is filtered with a bandpass filter 4 and fed to the ADC 6, where digital samples of the signal and interference mixture are generated. The values of the samples from the output of the ADC 6 are fed to the first input of the WU 7.
In WU 7, according to the values of the samples, the values of the signal power and interference are calculated, which are used in calculating their ratio (current value) and the ratio of the current and minimum acceptable values of the ratio of signal power and interference (the value of the ratio of OOSP and OSP).
In VU 7, the value of the receipt receipt information code code is set: the code corresponding to the fact of receiving information is set if the value of the OOSP ratio and the current OSP value is less than one, the code corresponding to the fact that the information has not been received is set otherwise.
The value of the ratio of the OOSP and the current value of the OSP and a code message stating that the information has not been received or received is fed from the first output of the VU 7 to the first input of the modulator 9, where this information is modulated accordingly, after which it is sent to the first input of the transmitter 8 and emitted through the antenna 1.
Also, in WU 7, the code of the received receipt is analyzed that the information is accepted or not accepted by the transmitting party.
If a code message is received that the information has been received, the value of the signal output power is calculated by multiplying the value of the output power with which the information (current value) was transmitted by the received value of the OOSP and OSP ratio and by a correction coefficient, the value of which is determined in advance (formula 1).
The calculated value of the output power from the second output of the VU 7 is fed to the second input of the transmitter 8 and sets the calculated power value in it by correspondingly increasing or decreasing the gain of the power amplifier, which is part of the transmitter 8.
If the calculated value of the transmitter power becomes equal to or greater than the maximum allowable value of the output power or becomes equal to or less than the minimum allowable value of the transmitter output power, then the current power value is set to the maximum allowable or minimum allowable, respectively. This information from the second output of the VU 7 is fed to the second input of the transmitter 8, where they set the corresponding value of the output power of the transmitter.
Information from an external device (not shown in FIG. 2) is fed from the input of the device to the second inputs of WU 7 and modulator 9.
In the modulator 9, this information is modulated accordingly, after which it is fed to the first input of the transmitter 8 and radiated through the antenna 1.
In WU 7 information is stored for some time, set in advance.
If in WU 7 it is established that a code message has been received that information is not received by the station to which it was transmitted, then this information is transmitted from the first output of WU 7 to the input of transmitter 8.
At the same time, information on the power value is sent from the second output of the VU 7 to the second input of the transmitter 8, which is calculated by multiplying the current power value by the power increase coefficient, the value of which is set in advance, for example, at which the calculated power value becomes close to the maximum possible, and in the next time cycle retransmit information, the receipt of which is not received confirmation, with a given power level.
Computing device 7 can be performed, for example, as a single microprocessor device with appropriate software, for example, a processor series TMS320VC5416 from Texas Instruments, or as a programmable logic integrated circuit (FPGA), with appropriate software, for example, Xilinx FPGA from Xilinx.
ADC 6 can be performed, for example, on an AD7495BR chip from Analog Devices.
Thus, this device allows you to implement the proposed method of changing the power level of the transmitters of communications depending on changes in the jamming environment, and also provides information in the event of loss of information packets, and thereby improve the efficiency of communication systems in terms of increasing the stability of radio communications in the presence of nonstationary interference, to improve the electromagnetic compatibility of communications, to increase operational characteristics, namely, the service life of transmitters of communications.
Claims (31)
 A method for adaptive power control in a secondorder linear prediction radio channel of an interference power value, comprising the following steps:
  measurement of signal power level and interference power level at the respective receiving station;
  regulation of the power of signals emitted by the transmitting device;
  repeated repetition of these steps;
 using a fixed value that corresponds to the minimum assigned value of the ratio of the carrier power of the received signal to the interference power;
 transmit power control data from the corresponding receiving station to the transmitting device;
 calculations are performed at the corresponding receiving station;
 adjusting the power of the signals emitted by the transmitting device includes the operation of setting the power of the signal emitted by the transmitting device, which includes the following:
  setting the power of the signals emitted by the transmitting device, if its value is less than the maximum allowable power and more than the minimum allowable power;
  setting the power of the signals emitted by the transmitting device equal to said maximum allowable power if said product is greater than or equal to said power;
  setting the power of the signals emitted by the transmitter to be equal to said minimum allowable power, if the power is less than or equal to said minimum allowable power;
 the transmission and reception of information is carried out at fixed frequencies or at different frequencies when using the tuning of the working frequency, including pseudorandom tuning of the working frequency (PFRCH), characterized in that
 information exchange is carried out in a pointtopoint communication line, a transmitting device, station No. 1  a receiving station, station No. 2 in the time division of channels, the operation of each station consists of time cycles, each cycle consists of an information transmission interval and an information reception interval for station No. 1, information reception interval and information transmission interval for station No. 2,
 information exchange is carried out in two stages:
 station No. 1 in the first time cycle transmits information or a pilot signal to station No. 2 with maximum power,
 at station No. 2, when receiving information, after measuring the signal and interference powers, their ratio is calculated  the current value of the signaltonoise ratio (SIR), and also the value of the ratio of a fixed value that corresponds to the minimum assigned ratio of the carrier power of the received signal to the interference power is calculated  the minimum allowable ratio of signal power and interference (OOSP) and SIR, transmit information and the mentioned calculated value with maximum power;
 at station No. 1, when receiving information, after measuring the signal and interference powers, their ratio (SIR) is calculated, and the ratio of a fixed value corresponding to the minimum assigned ratio of the received signal carrier power to the interference power (SPS) and SIR is calculated, information is transmitted and said calculated value with maximum power;
 in the second time cycle in each station after receiving information, in addition to the above operations, calculate the value of the output power of the signal by multiplying the value of the output power with which the information was transmitted (the current value) by the received value of the ratio of OOSP and OSP and the correction factor, the value of which is determined in advance, the transmitter power is set equal to the calculated value,
 at the stage of information exchange with adaptive power control:
 in each station, assign the value 0 to the number of the information reception interval and store it;
 in the first time cycle, in the information transmission interval, station No. 1 (No. 2) transmits the information and the value of the ratio of the OOSP and OSP calculated with the installed power calculated in the previous information exchange cycle;
 in the first time cycle in station No. 1 (No. 2) in the interval of information reception:
 after measuring the signal power and interference, their ratio (SIR) is calculated, and the ratio of the SIR and SIR is also calculated;
 calculate the value of the output power of the signal by multiplying the current value of the output power by the adopted value of the ratio of OOSP and OSP and the correction factor;
 set the values of the codes of the receipt of information: the code corresponding to the fact of receiving the information is set if the value of the relationship between the SIA and the SIA is less than one, the code corresponding to the fact that the information is not accepted is set otherwise;
 increase the value of the number of the interval for receiving information by 1 and remember it;
 starting from the first information reception interval, the difference between the interference power values measured at the current moment and at the time of the previous reception is calculated, if this value exceeds a predetermined threshold, then the interference power value for the next moment of information reception is estimated using the secondorder linear prediction method, otherwise case, as the value of the interference power for the next moment of reception using the current measured value of the interference power,
 starting from the second time cycle:
 in each station, in addition to the operations mentioned, they analyze the receipt code for receiving or not receiving information, if a code message is received that the information has been received, the calculated transmitter power value is set in the stations;
 otherwise, in the next time cycle, information on the receipt of which confirmation is not received is retransmitted with the power, the value of which is calculated by multiplying its current value by the power increase coefficient, the value of which is set in advance;
 Further work continues according to the described procedure.
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