SU1022321A2 - Radio communication system with frequency adaptation - Google Patents

Abstract

RADIO COMMUNICATION SYSTEM WITH ADAPTATION BY FREQUENCY according to author. St. 573892, characterized in that ,; In order to increase noise immunity by reducing the number of signal perevers, the control unit whose output is connected to the second J - 7; input of the tuning unit and the input to the second output of the signal separation unit on the receiving side are entered into it; serially connected time sensor, tuning signal generator and switch, the second input of which is combined with the input of the control unit and connected to the output of the demodulator, between the input of which and / output of the addition unit a key is entered, the second input of which combined with the output of the time sensor and connected to the third input of the switch, with the output of the control unit connected to the input of the time sensor, to the second inputs. tuners and to the second input of the sg feedback signal conditioner. (L

Description

to go

Od NP The invention relates to radio communications and can be used in a system for transmitting information through fading channels. According to the main auth. 573892 a radio frequency-adaptive system is known that contains a modulator, a transponder, a tuning unit and a receiver of feedback signals on the transmitting side, and n receivers on the receive side according to the number of diversity branches whose outputs are connected to the slice-block inputs, output which is connected to the control input of the demodulator, the communication channel quality evaluation unit, the feedback signal generator and the tuning unit, the output of which is connected to the control input of one of the receivers, as well as on the transmitting side A frequency receiver connected between the modulator output and the transmitter input, and a signal separation unit connected between the output of the feedback signal receiver and the input of the tuner, the output of which is connected to the reference input of the frequency converter, and on the receiving side the compaction block. (nl ) communication quality assessment units and (p-1) tuning units, whose outputs are connected to the control inputs of the respective receivers, the outputs of the receivers are connected via the communication quality evaluation units to the inputs of the tuning units and to odes block seal koto cerned output connected to the input of the feedback signal l. However, the known radio communication system has insufficient noise immunity, due to the fact that the frequency adaptation of the system due to the lack of quality control of the channels during the communication process should be made periodically at predetermined time intervals. As a result, during the operation of a well-known radio communication system, there may be communication interruptions due to the lack of continuous monitoring of the current channel quality in the system — discontinuities of variable duration from the moment the total channel occurs to the next frequency tuning. Purpose of the invention — improving noise immunity by reducing the number of interruptions connection. This goal is achieved by the fact that the radio communication system is frequency adaptive, which contains a modulator, a transmitter, a tuner and a feedback signal receiver on the transmitting side, and G1 receivers on the receiving side by the number of diversity channels whose outputs are connected to the inputs an addition unit whose output is connected to the control input of the demodulator, a communication quality evaluation unit, a feedback signal conditioner and a tuning unit whose output is connected to the control input of one of the receivers, as well as The frequency converter side connected between the modulator output and the transmitter input, and the signal separation unit connected between the output of the feedback signal receiver and the input of the tuner, the output of which is connected to the reference input of the frequency converter, and a sealing block ( P-1) communication quality assessment units and (nl) tuning units, the outputs of which are connected to the control inputs of the respective receivers, and the outputs of the receivers through the communication channel quality assessment units s settings to the inputs and to the inputs of the sealing unit blocks, whose output is connected to the input of the feedback signal introduced at the transmitting side control unit, whose output is connected to the second input of the tuner and the input - to the second output of the separation unit; signal, on the receiving side, serially connected time sensor, tuning signal generator and switch, the second input of which is combined with the input of the control unit and connected to the output of the demodulator, between the input of which and the output of the addition block a key is entered, the second input of which is combined with the output of the time sensor and connected to the third input of the switch, with the output of the control unit connected to the input of the time sensor, to the second tuning units (P-1) of the setting units and to the second input of the feedback signal conditioner. The drawing shows a structural electrical circuit of the proposed radio communication system. The radio communication system with frequency adaptation contains a modulator 1, a transmitter 2, a tuning block 3, a receiver 4 feedback signals, a receiver 5, a block 6 adding, a demodulator 7, a block 8 for evaluating the quality of communication, a link, a driver 9 feedback signals, tuning unit 10, frequency converter 11, signal separation unit 12, compaction unit 13, D) -1 communication channel quality evaluation units 14 and rt -1 tuning units 15, feedback channel 16, unit 17 control, time sensor 18, key 19, shaper 20 of the tuning signal, switch 21 and control unit 22.

The radio system operates as follows.

Transmitter 2 emits test signals at all frequencies. Receivers 5 receive these signals by the number of diversity branches. The communication channel quality evaluation units 8 and 14 estimate the signal-to-interference ratio at the xicday frequency and determine which of the frequencies will be the best for each branch. The value of the number of this branch goes to the compacting unit 13 and then to the feedback signal generator 9, from which the signals carrying information about the numbers of optimal frequencies pass through the feedback channel 16 and arrive at the receiver 4 feedback signals. The received signals fall on the signal separation unit 12, in the form of information relating to the number of the optimal frequency of the branches. The values of these numbers go to block 3 of the settings and from there next to the frequency converter 11, the second input of which receives information from modulator 1. The generated signals from the frequency converter 11 go to transmitter 2 and are radiated to the air.

Simultaneously with transmitting the values of the optimal frequencies over the feedback channel 16, the signals from blocks 8 and 14 arrive at tuning blocks 10 and 15, which tune the receivers 5 to frequencies that are optimal for; corresponding branches of diversity. However, the signals from the outputs of the receivers 5 pos; They are blunt on the addition unit 6, from the output of which, the signal of the total channel is taken, through which the quality of the imaginary channel is evaluated.

When the quality of the total channel is better than the threshold value from block 17, the coitrol on the INPUT control unit of the settings 10 and 15 and to the input of the sensor 18 comes

Avari

both singing

signal

setting the elements of the system to the source condition for conducting a frequency tuning session, also to the second input of the former 9 for issuing

In the feedback channel of the signal 6, transferring the elements of the transmission path of the system to the frequency tuning mode. For the time of frequency tuning, the key 19 interrupts the passage of the test information to the MELT system. Instead of it, the tuning signal from the shaping unit 20 via the switch 21 from the system output: the tuning signal is output to the terminal equipment. At the end of the tuning, the partial signal produced by the sensor 18 is removed from the control inputs of the switch 19, FO1 4 of the switch 20 and the switch 21. As a result, on the receiving side, the information signals from the adding unit 6 through the switch 19, the demodulator 7 and the switch 21 are output to on-line equipment and at the same time to control unit 17 to continue monitoring the current quality of the total channel.

On the transmitting side, the Tuning signal received over the feedback channel 16 is extracted by the signal separation unit 12 and outputted as a single potential from the second output of the unit 12 to the input of the control unit 22. The control unit 22 outputs the signals to the input of the setting 3 unit ds of translating the transmitter into

the mode of radiation of all frequencies and to the terminal equipment for stopping the transmission of information at the time of frequency tuning.

The proposed communication system with i-round-the-clock operation - by; HF radio channels reduces the number and total duration of communication interruptions by 2-3 times, which allows to increase the noise immunity of the entire system.

Claims (1)

Radio Frequency Adaptation System by ed. St. No. 573892, characterized in that ;; in order to increase noise immunity by reducing the number of communication interruptions therein introduced on the transmission side control unit, whose output is connected to the second input of the tuner and the input - to ^g Ivtoromu output signal separating unit on the receiving side consecutively connected timer, driver adjustment signal and a switch, the second input of which is combined with the input of the control unit and connected to the output of the demodulator, between the input of which and the output of the addition unit a key is entered, the second input of which is combined with Odom time of the sensor and connected to the third input of the switch, wherein the output control unit is connected to the input time of the sensor, to second inputs of the n-1 blocks and settings to the second row driver ΒΧΟ- _β £ feedback signal.