SU1084854A1 - Device for receiving and processing noise-type signals - Google Patents

Abstract

A device for receiving and processing of noise-like signals, containing a correlation receiver, the first and second inputs of which are connected respectively to the first and second inputs of the device, the output driver, the outputs of which are the outputs of the device, and in each information channel the AND element and the counter, characterized by that, in order to increase its reliability, a generator of reference signals was inserted into it and a modulo two adder, a decoder and a NOT element, the output of which is connected to the first input element And the second input of which is connected to the output of the modulo two adder, the output of the element And is connected to the first input of the counter, the outputs of which are connected to the input of the element NOT through the decoder, the outputs of the generator of reference signals are connected to the first inputs of the adders of the corresponding information channels, the second inputs which are combined and connected to the output of the correlation receiver, the outputs of the decoders of information channels are connected to the corresponding first and second inputs of the driver output signals The combined third modulo inputs and the combined second inputs of information counters (LS, the generator of reference signals and the second input of the output signal generator are connected to the third, fourth, fifth, and sixth inputs of the device, respectively. about 00 4 00 cd 4 ::

Description

The invention relates to a technique for receiving discrete data and can be used in devices for receiving discrete information that is non-reparable with complex signals. A device for discrete processing of complex signals is known, which contains a circuit for identifying a signal element whose inputs are connected to the first and second input buses of a device, a selection circuit but a maximum, a comparison circuit of codes and P channels, each of which contains a modulo two, an element HE. And, the pulse counter, and in each channel the output element And is connected to the counting input of the pulse counter, and its first input through the inverter - with the output of the modulo adder two, the first inputs of all adders but two modules They are not connected to the output of the signal element identification circuit, and their second inputs are connected to the corresponding inputs of the generator of copies of the expected signals, the input of which is connected to the third input bus of the device, the second inputs of the AND elements are connected to the fourth input bus of the device, the inputs “Reset of pulse counters are connected to fifth device length, meter outputs are connected to the corresponding inputs of the selection circuit to the maximum, some of the outputs of which are connected to the device output tins, and the other part of them with a part of the circuit inputs compared to and codes, the other inputs1 of which are connected to the corresponding input buses of the device, the natural input of the device is connected to the additional input of the selection circuit to the maximum, and the output of the code comparison circuit is connected to the additional output bus of the device 1. The disadvantage of such a device for discrete processing of complex signals is its complexity. The closest in technical essence to the present invention is a device for receiving and controlling the reliability of digital information, which contains a receiver, whose input is connected to the input of the device, information output - to the first input of the output driver (analyzer and processing unit), correlation outputs of the receiver through the OR element are connected to the input of the control unit and in each information channel are connected in series (key, AND element), pulse shaper and counter, the output of which is connected to the input and output of the output driver, the outputs of the control unit are connected to the control input of the output signals generator, counters and information channel keys, the information inputs of the keys are connected to the corresponding Correlation inputs of the correlation receiver 2. However, the well-known device is rather complicated, which reduces its reliability . The purpose of the invention is to increase the reliability of the device. The goal is achieved by the fact that, in a device for receiving and processing noise-like signals, there is a correlation receiver, the first and second inputs of which are connected respectively to the first and second inputs of the device, the output driver, the outputs of which are outputs of the device, and in each information channel element And and the counter, entered the generator of reference signals and in each information channel entered modulo two adder, the decoder and the element NOT, the output of which is connected to the first input of the element And, the second input of which is connected to the output of an adder modulo two, the output of the element I is connected to the first input of the counter, the outputs of which are connected through the decoder to the input of the element NO, the outputs of the generator of reference signals are connected to the first inputs of the adders of the corresponding information channels, the second inputs of which are combined and connected to the output of the correlation receiver, the outputs of the decoders of the information channels are connected to the corresponding first and second inputs of the output driver, the combined third inputs adders but a module two and the combined second inputs of the counters of information channels, the input of the generator of reference signals and the second input of the driver, are connected to the third, right, and secondary inputs of the device, respectively. The drawing shows a functional diagram of the proposed device. The device contains a correlation receiver 1, a generator of 2 signals, each information channel contains an adder 3 modulo two, an AND 4 element, a pulse counter 5, a decryptor 6 and a HE element 7, as well as an address decoder 8, an information bus 9, a slime 10 reference signals, clock 11, clock pulses, bus 12 clock pulses, bus 13 pulses, reset, bus 14 read pulses, device outputs 15-19. The correlation receiver 1 can be performed, for example, on a reference signal generator, multiplier, integrator, decision circuit, integrator voltage reset element. The processed complex noise signal goes to bus 9, the bus 10-14 receives the pulses necessary for discrete processing of a complex signal.

The device works as follows.

Synchronously with the beginning of the formation of a noise-like signal at the transmitting point at the receiving point, the device bus 10 receives the pulses necessary for optimal reception of the binary signal. At the moment of termination of each binary element of a complex signal at the output of receiver 1, a level of "1 or" O will be formed depending on the received element and on the signal-to-noise ratio during the reception of this signal element. If there is no interference, the code of the signal at the output of the receiver I will exactly correspond to the code of the signal being processed. Simultaneously with the beginning of the arrival of the processed noise-like signal to the input of the generator 2, a synchronization pulse is received from the bus 11, under whose action P copies of the complex signals expected by the device are generated at its outputs. If the signal element levels at both inputs of the adder 3 modulo two are the same (ones or zeros), then at its output a zero signal level will be formed, otherwise it is equal to one. Under the action of a single-level signal formed at the output of the adder 3, the And 4 element opens at the second input. At the first input element AND

4At the end of the reception of each element of a complex signal, short clock pulses of a unit level from the bus 12 arrive. Before the first clock pulse arrives on bus 12, a reset pulse arrives on bus 13 upon reception of the first signal element, under which all counters of the pulse 5 are reset. the As a result, zero levels are set at the outputs of the decoders 6, and single level signals will be sent to the second inputs of the And 4 elements.

In those processing channels in which at the time of arrival of the clock pulse 12 bus at the inputs of adders 3, the signal element levels (copies and signal at receiver output 1) will have different levels, through element 4, one pulse will arrive at the input of counter 5 pulses.

If a complex signal arrives at the input 9 of the device without interference, then in one of the channels the code of the signal elements generated at the output of receiver 1 will correspond to the code of the copy of the expected signal. As a result, in this channel to the input of the counter

No pulses will be received for 5 pulses. In the remaining channels, the codes of the complex signal and copies of the expected signals arriving at the inputs of adders 3 will be orthogonal (or quasi-orthogonal) and, therefore, at the moment of arrival of the pulses on the bus 12, the levels of the elements of the signals at the inputs of these adders 3 will not be

match with each other 0.5N (or 0.5 (N -f 1) times during the reception of a complex signal, where N is the number of elements in the complex signal and the AND 4 element in each case of a mismatch will open at the second input to pass through clock pulses from the bus 12 to the inputs of the corresponding counters 5 pulses.

As the level of interference increases - on the input of the device, receiver 1 will receive part of the signal elements incorrectly, and the higher the level of interference, the more elements of the signal will be received incorrectly.

As a result, in the information channel in which the code of the copy of the expected signal corresponds to the code of the complex signal being processed, pulses will be sent to the input of the pulse counter 5 and the larger the higher the level of interference. In the remaining channels, the number of mismatch of signal elements at the inputs of adders 3 will increase or decrease during the reception of a complex signal relative to a value of 0.5 N or 0.5 (N-t-1).

When a signal arrives at the input of the counter 5 pulses after setting it to the initial state of a certain (threshold) number of pulses, the corresponding decoder b is triggered, a single level is set at its output, and a zero level at the second input of the element 4, resulting in from this point in time, no clock pulse will pass to the input of the counter.

Decoders 6 are adjusted to such a state of 5 pulse counters that during reception of a complex signal only one of the P decoders may not work, and if there is no signal at the device input or there is a high level of interference, the probability of a single decoder 6 not working would be less than the allowable value.

The number of the processing channel, in which during the processing of a complex signal the decoder does not operate, indicates the number of the received complex signal.

Signals (levels "1 and" O) from the outputs of the decoders 6 are fed to the corresponding inputs of the decoder 8. The decoder 8 performs the function of determining the channel number, where the decision about the signal effect and registration of the detected signal are made. The channel number is determined after entering the bus 12 for. the time of action of the complex signal of the last clock pulse, but until the moment when the counters 5 are reset to the initial state. Determining the channel number and the fact of detection of the signal is produced by a pulse arriving at the control input of the descrambler 8 from strip 14. Information about the number of the received noise-like signal (bus 16-19) and the fact of its detection (bus 15) can be output by the decoder 8 in binary code. 5 The proposed device differs from the well-known (in this case, basic) simplification of the correlation receiver circuit (only one is used instead of the P channels), except for each information channel of a rather complex pulse generator forming variable polarity amplitudes and decreasing the number of trigger points in the counters 5 pulses. Thus, in a known device, an impulse counter in an information channel should allow counting without overflow the number of pulses of at least the number of elements in a complex signal. For the complex signal being processed, the maximum number of positions, in 10848 4 of which the symbols of the decision sequence codes at the output of the signal element receiver and the corresponding copy of the complex signal do not match, less than a quarter of the number of elements in the complex signal. Therefore, the proposed device makes it possible to reduce the volume of the pulse counter in each channel as compared with the known one by two flip-flops. And since the number of complex signals used to transmit discrete information is usually 16-32, the benefit from reducing the number of elements in the device for discrete processing of complex (noise-like) signals will in this case be significant, which will improve the reliability of such a device.

Claims (1)

A device for receiving and processing noise-like signals, containing a correlation receiver, the first and second inputs of which are connected respectively to the first and second inputs of the device, the output driver, the outputs of which are the outputs of the device, and in each information channel, the element And and the counter, characterized in that , in order to increase its reliability, a reference signal generator is introduced into it and an adder modulo two, a decoder and a NOT element, the output of which is connected to the first the input of the element And, the second input of which is connected to the output of the adder modulo two, the output of the element соедин is connected to the first input of the counter, whose outputs are connected through the decoder to the input of the element NOT, the outputs of the reference signal generator are connected to the first inputs of the adders of the corresponding information channels, the second inputs of which combined and connected to the output of the correlation receiver, the outputs of the decoders of the information channels are connected to the corresponding first and second inputs of the output signal shaper, United s third inputs of the adders modulo two and the combined second inputs of the counters of information channels, the input reference signal generator and a second input of the output signals are respectively connected to the third, fourth, fifth and sixth inputs of the device.