SU784015A1 - Multichannel communication system with noise-like signals and time division of channels - Google Patents

Description

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The invention relates to communication technology and can be used in broadband multichannel communication lines.

A known multichannel adaptive communication system with noise-like signals and time division channels contains information sources on the transmitting side, a commutator, a noise-like signal generator, the output of which is connected to the first input of the phase manipulator, the second input of which is connected to the VChod of the frequency generator, and 15 serially connected clock generator, driver of control pulses and a channel counter, the output of which is connected to. the first input of the switch, the second of which is connected to the second output of the control generator: pulses, the second output of the clock generator is connected to the input of the noise-canceling generator, and the synchronization unit, the first input and output are connected respectively with the first output of the noise-like signal generator and input,} 30

clock generator, the output of which is connected to the first input of the driver control pulse generator, the second input is And the first output of which is connected respectively to the second output of the noise-like signal and the input of the channel counter, the output of the KOTbfJoro is connected to the input of the switch, the outputs of which are connected to the inputs of information receivers , the second input of the synchronization unit is connected to the inputs of the circuits, each of which consists of a delay element and a series-connected phase manipulator, a mixer, the second input of which is a local oscillator signal, an intermediate frequency amplifier, a phase detector, the second input of which is assembled; iyen with a quartz output yyry 6y and HHteTiTpaTOpa, additional ikhod kotrrbgo connected S0tvetv vennb with the input and output of the element of the output, to the input of which is connected the second output of the driver control pulses, and the generator shums such signals connected to an additional output blokagsmgnhroynzatsii.

However, the known system has low noise immunity.

The purpose of the invention is improving noise immunity,

. For this, a multichannel adaptive communication system with noise-like WSfcHrHaHaMK and time division channels containing information sources on the transmitting side, a switch, a noise-like signal generator; a catch whose output is connected to the first input of a physical trading manipulator, to the second of which is connected an output

carrier frequency generator, and after the connected generator

clock pulse shaper

 yn gn & yyykh impuli with- “yotchi.k kaniyavv, which is connected to the first Iyoku switch, the second input

 1K: W8 1 6 P; Line with the second output) MW: control pulses rotate, with the second output of the generator of clock pulses connected to the input

Noise-like signal generator, and

on the receiving side there is a synchronization unit, the first input and output of which are connected respectively to the first

by the generator of noise-like signals by the clock generator

 1iffify Hbc6§v which is connected to the first input of the driver for controlling pulses, the second input and the first output of which are connected respectively to the second output of the noise-like signals from the Tener and the input from the channels, the output of which is connected to the switch5 inputs of receivers of information, with the second input of the block synchronizing and connected to the inputs of the circuits, each of which is a delay delay and connected in series to the phase switch, the mixer, to the second input signal of the local oscillator, intermediate frequency amplifier, phase detector, the second input of which is soy jifftiBWHc sheych: ode of the Holmes generator | ) integrator, add:

Vyody-which are connected in accordance with the input and output of the element

 This is the second output of the driver for controlling the pulse and the transmitter of the noise-like signal generator is connected to the additional output of the synchronization unit, according to the invention, the encoder, the encoder, and the connected inverse link receiver are inserted on the transmitting side and block

controls whose outputs are connected to the control inputs of the noise control signals and the coding block, the information and tfxdjfcfta of which are connected respectively to the outputs of the information sources of the bGGBTelter input, which outputs

to the inputs of the encoder / outputs KOTORO1CHE connect it with additional inputs

a noise-like signal generator, and the third output of the control pulse generator is connected to the corresponding input of the coding unit, a decoder and serially connected control unit and a maximum signal extraction unit are inputted on the receiving side, the outputs of which are connected to the inputs of the deshifter, the outputs of which are connected to the additional inputs of the switch, the integrator outputs are connected to the corresponding inputs of the maximum signal extraction unit, and the second input of the synchronization unit is connected to the input management house

Figure 1 shows the structural electrical circuit of the transmitting side of the proposed system; 2, the receiving side of the proposed system.

The multichannel adaptive communication system with transform-like signals and time division multiplexing contains on the transmitting side (fig.1): sources 1 of information, block 2 of coding, switch 3, encoder 4, generator 5 noise-like signals, phase manipulator b, carrier 7 frequency, control pulse generator 8, 9 channel counter, 10 clock pulse generator, reverse channel receiver 11, interference level analyzer 12, control unit 13, on the receiving side (FIG. 2): control unit 14, synchronization unit 15, generator 16 clock pulses, 17 noise-like signals generator 17, control pulse generator 18, counter 19 channels, maximum signal extraction unit 20, decoder 21, switch 22, crystal oscillator 23, circuits 24, consisting of phase manipulator 25, mixer 26, intermediate amplifier 27 frequency, phase detector 28, integrator 29, delay elements 30, information receivers 31. The local oscillator signal is sent to the second input of the mixer.

Multichannel adaptive system works as follows.

Signals of duration Tj, generated by each of the m 1 information sources / synchronously, arrive at coding block 2, where they are distributed into n groups of m / n signals each, each of which is primary with n times. The total duration of each group remains the same as in the impulse with a temporary amplification of m channels without Recoding, equal to t TO.

Switch 3 simultaneously reads information from the first positions of all groups and transmits it to encoder 4, where the resulting combination at the input corresponds to a signal at 5 odnrm from 2 outputs.

The signal from the output of the encoder 4 enters the generator 5 of noise-like signals, is transformed in the latter, and through the phase manipulator b, where the phase manipulation of the fviec I frequency from the generator 7 of the carrier frequency occurs, arrives at the transmitter output.

The operation of the block 2 and the encoder 4 is carried out using control pulses from the driver 8, which is synchronized by the generator 10 clock adipulses, and signals from the 9-channel counter, the input of which is connected to the output of the driver 8 of the control pulses.

The interference level analyzer 12, whose input is connected to the output of the reverse channel receiver 11, continuously analyzes the signal-to-noise ratio. The control unit 13, the input of which is connected to the output of the analyzer 12, and the outputs to block 2 and the noise-like signal generator 5, controls the operation modes of block 2, in which, when signals are received from control block 13, information is not read from 1, ... , n-1 group, which leads to a reduction in the dictionary of transmitted messages. The signals from the output of the control unit 13 are also fed to the input of the generator 5 of noise-like signaling speakers, controlling its operation.

At the receiving side, the received signals are fed to phase handlers 25 of the circuits 24, the second inputs of which from the generator 17 of noise-like signals receive 2 reference signals, respectively. Further processing of the received signal in each of the chains occurs in the following stages: from the output of phase manipulator 25 to the input of mixer 26, to the second input of which the signal H comes from the local oscillator, from the output of mixer 26 to the input of amplifier 27 of intermediate frequency, from the output of which the input of the phase detector 28, the second input of which receives a signal from the hf of the square generator 23, from the output of the phase detector 28 to the input of the integrators 29.

From the outputs of the integrators 29, the received signal is fed to the inputs of the block 20 for allocating the maximum signal, which outputs at one of its 2 outputs a signal corresponding to the maximum signal at one of the sources 2. their inputs. The signal from the output of block 20 enters the decoder 21, cat6 | Depending on which of the two inputs received a signal, the output of one of the two possible, code-based combines at the p outputs is through the switch 22 to the information receivers 31. At the next moment in time, the switch 22 issues a code combination following a group of n elements such that the process is repeated .N / n times

When changing modes of operation (exclusion of one or several groups of sources of information 1), i.e. When f adapting the system to a changing interference environment, block 14 selects the signal arriving at block 20.

Generator control 17 noise-like signals, integrators

29, switch 22 is implemented

 using control pulses from the outputs of the driver 18 control pulses, synchronized by means of a 16 clock pulse generator, whose input is connected to the output of the block 15,

The operation of the switch 22 is controlled by a counter of 19 channels, the input of which receives signals from the driver 18 of the control pulses.

An increase in noise immunity is achieved in the proposed system in two stages. In the first stage, when transcoding with increasing number

5, with the same signal-to-noise ratio, the probability of erroneous reception is reduced. So, for a fixed value of 10 db, when going to with respect to a system without

Q. Recoding, the probability of erroneous reception of one bit is reduced from P to Pe, / n. 2. On the other hand, to ensure that the specified probability of error, for example,

R 10, for recoding system5

It requires a lower signal-to-noise ratio. For example, the energy gain of a system with respect to a system without transcoding is 4.4 dB.

0 At the second stage, during adaptation, the increase in noise immunity is achieved by the exclusion of certain groups of information sources and, as a result, an increase in the energy transmitted by one bit of transmitted information.

Claims (1)

Invention Formula 50, Multichannel adaptive communication system with noise-like signals and time channel separation containing on the transmitter side information sources, KONwyTaTop, generator 55 noise-like signals, the output of which is connected to the first input of the phase switch, to the second input of which the output of the frequency generator is connected, and in series 40 connected clock generator, driver control pulse: ow and counter of channels, the output of which is connected to the first input of the switch, the second input of which is connected 45 with the second output of the driver for controlling pulses, while the Second output of the clock generator is connected to the input of a noise-like signal generator, and on the receiving side - a synchronization unit, the first input and output of which are connected to the first output of the noise signal generator and the clock generator impulses, the output of which is connected to the first input of the control output puller, the second input and the first output of which are connected respectively to the second output of the noise-like signal generator and the input of the channel counter, the output of which is connected to the input of the switch, the outputs of which are connected to the inputs of information receivers, the second input of the synchronization unit connected to the inputs of the circuits, each consisting of an element and serially connected phase manipulator, a mixer, the second of which is supplied The signal is single intermediate, the intermediate frequency amplifier, the phase detector - the second input icbf оIpot-b is connected to the output of the quartz oscillator, and the integrator, in addition, the individual inputs of which are with the input and delays of the delay element, the second output of the control pulse shaper is connected to the KOToiio input, and the input of the noise-suppressing signal generator is connected to an additional output; a synchronization unit that is Potential stability, on the transmitting side, a coding unit of an encoder and a series-connected reverse channel receiver, an interference level analyzer and a control unit (th, KOToik outputs are connected to the control inputs of the noise-like signal generator and the block to; idi- fication, information inputs and outputs of which with; are united, respectively, with inputs of information sources and additional inputs of the switch, the KOToipo OUTPUT is connected to the inputs of the encoder; the outputs of which are connected to “TafibHtJMH with the inputs of the noise suppressor with ignals, and the third output QF for control pulses is connected to the corresponding input of the coding unit, on the receiving side; 1 in the decoder and sequentially connected control unit and the maximum signal extraction unit, the outputs of which are connected to the decoder inputs, the outputs of which are connected to additional the inputs of the switch, the outputs of the integraT. P ° OD are connected to the corresponding inputs; n; am, the maximum signal extraction unit, and the second input of the synchronization unit is connected to the input of the control unit. Sources of information taken into account in the examination I, USSR Author's Certificate 333716, cl. H 04 J 3/04, 1972 (prototype). L..L..Ü ± .J VII