SU1021000A1 - Optimum communication frequency discriminating device - Google Patents

Abstract

A DEVICE FOR ISOLATING OPTIMAL COMMUNICATION FREQUENCIES, containing consecutively connected receiver, comparison unit, pulse driver, converter, reversion unit, memory unit and frequency analyzer, the second input and output of which are connected respectively to the first output and input of the control unit, And | than the second output of the reversing unit is connected to the first input of the reference signal generator, the second n input inputs, and the second input. Kotorogb Connected respectively to vt p1M and the third inputs of the receiver and with. the first input of the key, the output of which is connected with the first input of the first adder. The second input and output of which are connected respectively to the antenna through the input unit and to the input of the receiver, the second output of which is connected to the first input of the unit of the preliminary installation, the second, third and fourth inputs of the reversing unit are connected respectively to the second and rpef / am outputs of the converter The output I of the preset unit and the second input and the codes of the control unit are connected respectively to the third output of the converter and the control inputs of the key of the reference signal generator,; a presetting unit, a comparator unit, a reversing unit and a memory unit, about aphid. In order to improve the accuracy of selecting the optimum communication frequencies, a delay unit, a radio receiver, a discrete signal receiver, a discrete signal generator, a compensator signal generator, compensation unit, amplifier amplifiers, coincidence unit, trigger, detector, filter, delay element, second adder, first n second key blocks, while the output of the input block is connected via serially connected iopriemnik, a second input coupled to a signal generator S kompensadii receiver of digital signals, a second input coupled to the receiver vtorymVyhodbm discrete signals, a first key block, a second input coupled to: trigger output, a second adder ele§; delay ment, detector, second input; the cakes are connected via the output of the second key block, the amplifier block, the N9 compensation block, the second input of which is connected to the output of the compensation signal generator, to the fourth input of the successor, the third output of which is connected to the input of the delay block, the output | of which is connected to the third and the second inputs, respectively, of the computer block and the driver of the compensation signals, the third and fourth and third inputs of which are connected to the third one, respectively, with the output of the block matched to the output of the discrete sig als, wherein a fifth input receiver coupled to vyhbdom block matcher, first, second and third inputs connected respectively to the Auto "{lm radio shlhodom with four

Description

The output of the receiver and the first output of the receiver of discrete signals, in addition, the second output of the comparator unit is connected to the first one. the entrance to the second

; block of keys, the second input of which is connected through three: ger with the first output of the receiver of discrete signals.

: The invention relates to a radio communication technique and can be used at communication stations for the automatic evaluation of channels and the allocation of communication frequencies in adaptive systems. A device for allocating optimum communication frequencies is known, comprising an "ace". The receiver, a comparison unit, a pulse shaper, a transducer, a reversing unit, a memory unit and a frequency analyzer, the second input and output of which are connected to the first outputs and the control unit input, the second output of the reversing unit are connected to the first input of the driver the reference signal, the second and third inputs and Bbjxqp of which are connected respectively to the second and third inputs of the receiver and to the first input of the key, the output of which is connected to the BBiM input of the first adder, the second. the input and output of which are connected to the antenna through the input block I to the first input of the receiver, the second of which is connected to the first input of the presetting unit, the second, third and fourth input / Ol of the {reverse unit) connected to the second and third outputs of the converter, and the output of the unit and the secondary installation, and the second input and the outputs of the control unit are connected respectively. but with the third output of the converter, the control inputs of the key, the reference signal generator, the presetter, the comparator, the reversing unit, and the memory block C However, the known device has a low accuracy of selecting the optimum communication frequencies. The purpose of the invention is to improve the accuracy of the selection of communication frequencies ohgam. In order to achieve the goal, the optimal frequency of the communication frequencies, containing a receiver connected in series, a comparison unit, a pulse shaper, a converter, a revisioning unit, a memory unit and a frequency analyzer, the second input and output of which are connected to the first, output and input of the control unit, the second output of the reversing unit is connected to the first input of the maker of the grid signal, the second and third inlets; u and the output of which are connected respectively to the second and third inputs of emnika and the first input key, whose output is connected to a first input of a first one mmatora, and- a second input the output of which are respectively connected to the antenna through the input unit and to the first input when; emnika, second, whose output is connected; The first input of the presetting unit, the second, third and fourth inputs of the reversing unit are connected respectively to the second and third outputs of the converter and the output of the pre-installation block, and the second input and control outputs are connected respectively to the third output of the converter and the control inputs of the key, driver a reference signal, a presetting unit, a comparison unit, a reversing unit and a memory unit, a delay unit, a radio receiver, a dacront receiver , shaper of discrete signals, shaper of compensation signals, compensation unit, amplifier unit, match-drop unit, trigger, detector, filter, delay element, second adder, first and second key blocks, while the output of the single-unit unit is connected via a series-connected radio receiver The second input of which is connected to the formative compensation signals, the receiver of discrete signals, the generator of discrete signals, the second input of which is connected to the second output of the receiver of discrete signals, the first block of the key it, the second input of which is connected to the trigger output, the second summation delay element, the detector, the second input of which is connected via output to the output of the second key block, the amplifier unit, the compensation unit, the second input of which is connected to the fourth input of the receiver The third output of which is connected with the 6th input of the delay unit, the output of which is connected to the third and second inputs, respectively, of the compensation unit and the compensation signal generator, the third, fourth and fifth inputs of which are connected respectively, with the third input of the receiver, with the output of the coincident output and with the output of the discrete signal generator, the fifth input of the receiver connected to the output of the grandma matching, the first, second and third signals of the radio receiver, with the fourth output of the receiver n with the first the output of the receiver of discrete signals, moreover, the second output of the comparator unit is connected to the first input of the second key block, the second input of which is connected via a trigger to the first output of the discrete receiver catch. The drawing shows a structural electrical circuit of the destructive device. The device for allocating the communication link frequencies contains a terminal 1 consisting of a linear block 1, a switch i, an analyzer 1 frequencies -: and a non-linear block D., the first adder 2, the memory block 3, the driver 4 pulses, the reverse block 5, analyzer 7, frequencies, shaper 8 of the reference signal, consisting of the generator 9 of the reference signal, block 10 attenuator®, and the generator 11 of the low-frequency signal, la, presetting unit 12, input unit 13, control block 14, key 15, trigger 16, f ltr 17, delay element 18, 6k 19 coincidence, block 2 amplifiers, converter 21 delay unit 22; radio receiver 23, receiver 24 discrete signals, driver. 25 discrete signals, a compensator forcing 26, a command block 27, a detector 28, a second adder 29, a first DZ and a second 31 key blocks and an antenna 32. The device operates as follows. On commands given from block 14, the device is alternately tuned from frequency to frequency, respectively, of generation and reception. After the known time determined by the transition of the processes in receiver 1, the command from block 14 to block 5 records the signal from block 12 to the reverse register of this block, setting the register to a state corresponding to approximately the level of the reference signal from block 10. Then, at the command from block 14, the second input to block 1O transmits the converted signal from the reversible rester and at the same time {the key 15 "opens. The low-frequency signals are gradually converted into a high-frequency group signal, which mc with a known accuracy of the nominal nominal value, i.e. calibrated. This is done by using the ts atycch stabilization of the level, or by applying, limits depending on the type of modulation of the generated stichals. The signal, fed at the first input to block 1O, is measured in size by changing attenuation, which is manageable and consists in connecting one or more of the attenuator stages with keys that are opened with signals from the top 5. Accessory "1" - - unchanged in magnitude, the signal r is fed to the first qjTMMaTop 2, where it is folded with spatial interference from antenna 32. Served at the first input of terminal 1, this crank signal and interference is amplified in it and converted to the HH3Ksix frequency spectrum, and then fed to block 6, where for each of the K channels is narrow An axial rejection signal, respectively, with bandwidths and notches, much smaller than the transmitting bandwidth of the corresponding radio-channel channel filter, is produced, respectively, by raising the reference signal from interference and interference from the reference signal. Selected interference through an additional output is fed to the first & HOD of the first AOR key block. The signal and separately amplified by amplifiers with different amplification factors so that later, when the effective values of the signal and interference at the outputs of the detectors are equal, the known ratio in the levels between the signal n n & lechelt is not detected, detected by detectors, which are are the corresponding inputs of the null organ, and the bridge bridge circuit or differential amplifier, in which the magnitude of the components not allocated by the detectors of the constant components is measured. Comparison signal or a & the polarities or zero are fed to the corresponding pulse shaper, where, respectively, the polarities of the incoming игHHand or the absence of it are formed by the corresponding pulses, the reversing and stopping signal using, for example, triggers, and the setting signal (, O) is generated. when the comparison signal in algebraic value does not exceed some previously known sHaicy corresponding threshold levels. The generated signals are converted into converter 21 into generalized reversing and stopping signals and fed to block 5, and the stop signal (O) is also fed to block 14. In block 5, reversing signals are controlled through the appropriate switch to supply clock pulses to the corresponding reversing inputs the counting register, and the stop signal using the corresponding key stops the transmission of pulses to the inputs of the same register. The register signals are recoded and fed to the corresponding key-by-pass 10. Since the reverse register signals generally represent a paral / p-th digital signal, which in its significance corresponds to the effective noise level at the input of receiver 1 with the known ratios of the levels of the etodivrgo signal and noise at its output , then when a stop signal appears, the signal through the buffer register is read from the reverse register and fed to the record in block 3, Kyflia single from block 14 on the second input is given a command to start Referring to the appropriate frequency but measure a communication memory cell. In addition, the stop signal applied to block 14 allows, after epe ending, the command to receiver 1 to be sent to the subsequent frequency. The opamp for the operation is repeated at all frequencies, after which the commands from block 3 are read, and into the analyzer 7 is the signal of the level of interference and idiomas, but with this the signal of the frequency number is written to the analyzer 7, koToi & i is fed to the second input on block 14 After the first entry into the analyzer 7 psn, the Transfer command is received, according to which the signals of the noise level and the clock frequency are read from the input registers and written into the main registers, after which the noise signals are recorded in the input registers in the second reception frequency number f t from bp 14 are issued bitwise comparison instructions. The level signal detected as a result of the comparison is of lesser significance AND the corresponding signal of the frequency number is written in accordance with the corresponding registers or. remain in them, if they were in them before the operation compared difflsu If the result of the comparison is that the signals of the interference levels are equal in their significance, then the advantage is given in principle to the signal in the main register. After the first comparison, the analyzer 7 introduces the noise level signals and the third frequency numbers, and then the noise level signals are compared — newly entered and remaining as a result: the previous comparison in the main register. Such a pairwise comparison is made for the signals of the interference levels of all. frequency channels. The detected minimum interference level signal and the corresponding frequency number signal are read and written by the command from block 14; The corresponding storage registers are where,;, the PNIs are stored until the end of the subsequent comparison cycle and are used for visual indexing. Then. begins the cycle of evaluating the interference levels and selecting the frequency number described above. The coupling is performed as follows. The useful high-frequency discrete signals supplied from the TRIAL unit 13 to the radio receiver 23 are divided into radio-telephone channels, amplified in power and converted in frequency to low-frequency-discrete signals, i.e. signals on subcarriers that in radio receiver 23 are converted per channel per channel (square-shaped pulses) per channel, and "the accuracy of receiving discrete signals is improved here due to the received redundant information of frame synchronization and known engineering solutions." Received information and signals correspond to cyclic and clock synchronization signals and each channel of discrete signals. In the radio receiver 23, the reliability of reception of signals by cyclic sync signals is monitored and, if it is lower than the required one, a signal is sent to the control panel to change the operating frequency of the reception. Served feeds are regenerated in form and are converted per channel per discrete signals at subcarrier frequencies that are synchronous with the input signals. Clock and frame synchronization signals are used to ensure synchronicity and regeneration. Signals using a reference frequency signal and signals from block 2 2 are converted into a group signal of an intermediate frequency of one or another type of modulation equal to the intermediate frequency of the group signal from linear block 1 of receiver 1. Moreover, the signal is generated using a group signal, for example, a frequency module Delay 22 is only possible when the receiving frequencies coincide. With this coincidence, based on the frequency signals or the signals of the receiving frequency numbers supplied to block 10, and the signals from receiver 24 (XOTST from one of the K channels), a signal is generated that allows compensation, which in the driver 26 opens the key and thereby enables the supply of compensating signal to block 27 to which switch 12 of receiver 1 performs switching from the fourth input {depending on the type of modulation) - on the first or second input: receiver 1, while the first input of the switch is disconnected from the corresponding first or volts receiver input roto 1, useful group prdae are in radio receiver 1 and converted therein. The intermediate frequency group signal is delayed for a certain time and is fed to block 27. As the signals are generated from the same signals and crony (matched in time), the waveforms of these signals are, in time-like, and produced they are in a block 27 of the opposite polarity, due to which compensation is possible when combining these signals. In addition, the signal from the formatized 26 has a low level of intrinsic noise, since it is generated from sources with a low level of intrinsic noise, and to combat interference, the incoming taleste exceeding their useful signal, for example, the frequency modulation, are used engineering protection measures. Therefore, the level of the intrinsic noise of the signal differs from the level of the signal by about ~ SO4B and therefore the level of this noise during the compensation does not affect the level of; Mechanism from the receiver 1. When undercompensation or recombination, at the output of block 27, the polarity signals appear corresponding to the compensated or compensating signals, and interference. This or that useful signal of the result of compensation through the KOMN farop In receiver 1 is fed to a non-linear unit 1 of the same bpock, where the group useful section is split, pa / shokal, frequency conversion and power gain of channel signals, and further the signals are channel-by-channel delivered to block 6, where for each channel the pro-spectrum & signal that does not coincide with its spectrum of signaling signals, and therefore signals through public keys, the first block 30 is fed into an i7i filter where it is produced per channel filter of discrete spectra: signals and their addition to the group Schigal, i oTOpbtfi is fed to a detector 28 O & 0 {W e discrete channel signals are fed to the second adder 29, where the signals are added to the group p1born heterodinirukadiy sigish, which is delayed by the known delay element 18 and the synchro is fed into it or opposite of polarity) with a signal from filter 17 to the detector where the control signal is allocated, by the level of a direct pro-processor tone signal from FI-17 and by ps polarity, the signal is equal to zero-compensated or re-compensated signal or equal to zero when fully coupled. This control signal is filtered by a low-pass filter with a ni-bandwidth smaller than the channel bandwidth of a discrete signal. In addition, the reference signal reduces the level of jitter from the output. receiver 1 and, respectively, with output 6 of the block at compensation, close to 31 К «| д; К ооАной. ::. ; . If a reference signal appears in a channel that exceeds the channel noise level, AGC Or the limiter starts working from the reference signal and the noise level at the output of receiver 1 decreases; for example, the radiotelephone channel has a bandwidth of 3.1 kHz (Strode & The single channel of discrete signals is 1.2 aGp, and the low-pass filter bandwidth can be 5 O Hz, - t, that is, there are fewer times than the radiotelephone band and & 24 times the telegraph channel. WA different signal, as compared with interference of the superimposed channels.

the power of the control signal exceeded no less than 5 times the power of the mech on the detector output. This is possible when the power of the signal is not less than 4.8 times in the channel of the discrete signal and, accordingly, the 8 radio background signal channel is not less than the PRM 12 times the interference power. These power ratios in the channels can be doubled due to the fact that the detector improves the power ratio between the signal and the on-output interference by a factor of two compared with the ratio of the signal and the noise at its input.

In order to avoid counting on a moshnotape signal when evaluating interference in a radiotelephone channel, it is statically necessary for aO to practice that its level is more than 5 times less than interference power, i.e. this requirement is fulfilled with a margin. In addition, the passband of the low-pass filter can be reduced by a factor of 2 to 5 with the corresponding assumption that the compensation speed is reduced, and this. Even more, it will allow to reduce the ratio between signal powers and interference in the radiotelephone channel.

Thus, the compensation is automatically controlled. The signals supplied to the block; about 20 are amplified depending on the polarity in one of the amplification paths of the block 20 and are fed to control the level of the compensating signal to the block 27. These signals control the level adjustment of the signal according to the negative feedback principle, i.e. so that, with undercompensation, increase the output signal from the regulating element, and, when overcompensating, decrease it. The quality of compensation depends on the depth of the feedback and is determined in the fundamental amplification of the signals in block 20, and up to a certain limit — the greater the gain, the better this quality is. Full compensation is permanently impossible, as there is no control signal. This is known from the theory of automatic regulation. Not existing

The compensation or overcompensation in the usable mode with a corresponding feedback depth is small and practically does not reflect on the evaluation of channel interference, as was noted in the example.

Compensation begins to operate under the same conditions as soon as receiver receiver frequency 1 is set equal to radio receiver frequency 23. The transition process of setting time compensation terminates with transition processes in receiver 1 after the frequency is set.

This time is increased by the delay in supplying the reference signal in block 14. The rate of change of the reference signal does not exceed the compensation rate of the desired signal. Therefore, changes in compensation caused by a change in the reference signal are practically not manifested when the reference signal is set.

The technical and economic efficiency of the proposed device is to reduce the likelihood of allocating a worse-quality radio receiver, i.e., more efficient use of All frequencies allocated for adaptive communication. Let, for example, five frequencies be allocated for adaptive radio reception. Failure to participate in the choice of the optimal frequency may lead to the fact that the remaining four will choose a worse frequency for reception than the one on which radio reception already takes place, and switching to the newly selected optimum radio frequency will reduce the reliability of signal reception. If, on the choice of the optimal frequency, the frequency at which the reception of useful information is carried out, then in evaluating the channel interference, the useful signal evaluates as an interference, and thus the probability of loss of this frequency remains, as the optimum, jtpH allocation of the optimum frequency. Thus, in either case, the final technical and economic efficiency consists in; increase the knowledge of the received information.

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Claims (1)

A DEVICE FOR ALLOCATING THE OPTIMAL COMMUNICATION FREQUENCIES, comprising sequentially connected receiver, a comparison unit, a pulse shaper, a converter, a reversing unit, a memory unit and a frequency analyzer, the second input and output of which are connected respectively to the first outputs and input of the control unit, and the second _ output of the unit reversal is connected to the first input of the shaper of the reference signal, the second and third inputs and output. which are connected respectively to the second and third inputs of the receiver and to the first input of the key, the output of which is connected to the first input of the first adder, the second input and output of which are connected respectively to the antenna through the input unit and to the first input of the receiver, the second output of which is connected to the first input of the block pre-installation, and the second, third and fourth. inputs of the reversing unit are connected respectively to the second and three? dark converter outputs and output; pre-installation unit, and the second input and outputs of the control unit are connected respectively to the third output of the converter and the control inputs of the key of the driver of the reference signal, / pre-installation unit, comparison unit, reversing unit and memory unit, characterized in that, in order to improve the accuracy of the selection of optimal communication delay introduced frequency block, the radio receiver of digital signals, digital signal shaper, the cancellation signal generator, the compensation unit, a force ⁷ oil, coincidence block, trigger, detector, filter, delay element, second adder, first and second key blocks, while the output of the input block is connected through series-connected radio receivers, the second input of which is connected to the shaper of compensation signals, the receiver of discrete signals, the second the input of which is connected to the second Output of the receiver of discrete signals, the first block of keys, the second input of which is connected to: the output of the trigger, the second adder, ele; delay delay, a detector, the second input of which is connected through the filter to the output of the second key block, an amplifier block, a compensation block, the second input of which is connected to the output of the compensation signal generator, with the fourth input of the receiver, the third output of which is connected to the input of the delay block, output which is connected to the third and second inputs, respectively, of the compensation unit and the shaper of compensation signals, the third, fourth and fifth inputs of which are connected respectively to the third input of the receiver, the output of the block coincides I and with the output of the discrete signal generator, 'the fifth input of the receiver connected to the output of the coincidence unit, the first, second and third inputs of which are connected respectively with the second output of the radio receiver, with the fourth output of the receiver and the first output of the receiver of discrete signals, in addition, the second output of the comparison unit is connected to the first. the input of the second block of keys, the second input of which is connected through a third lane with the first output of the receiver of discrete signals.