SU642854A1 - Discrete information receiver - Google Patents

Description

The invention relates to radio and can be used to receive commands or short messages transmitted at random times to asymmetrical communication channels.

A device for receiving discrete information is known, comprising the first And element sequentially connected, the memory block, the second And terminal, the decoder and decipheror, and the trigger Ij.

However, the known device has a low bandwidth.

The purpose of the inventor is capacity bandwidth.

To do this, a device for receiving discrete information containing successively sindeelnye first element P. memory block, second element I. a decoder and a decoder, as well as a trigger, two time interval counters and an additional element I, and the output of the first element And through successively connected first and second counters of time intervals and additional elo.ment 1-1 is connected to another input. the second | -o time counter of the I1ggervalov, the KOTopoio output via a trigger is connected to the second inputs

the first and second elements And, and / another output of the decoder is connected to another input of the trigger, while the output of the first element And is connected to another input of the additional element I.

The drawing shows a structural electrical circuit of the device.

The device for receiving the discrete ipformatization contains the first And 1 1 element in series, the memory block 2, the second And 3 element, the decoder 4 and the decoder 5, as well as the trigger 6, two counters 7 and 8 time intervals and the additional And 9 element And the output of the element And 1 through serially connected counters 7 and 8 and additional e, Tement And 9 is connected to another input of counter 8, the output of which through trigger 6 is connected to the second inputs of elements M 1 and And 3, and another output of decoder 4 is connected to another trigger input 6, while the element 1 coupled to another vhodo.m ele.menta AND 9.

The device works in the following way.

Claims (1)

The ZlanHoe device implements the method of measuring the D.LINE of the zero interval in the BOD code vector, which is based on the following well-known fact: in the cyclic (n, k, d) code, the number of consecutive zeros does not exceed the values of k In the asymmetric channel, when p p ", where The RO is likely to be a distortion of the null symbol, and PI is a single symbol, the probability of suppressing a single symbol can be neglected. Therefore, under the influence of interference, the magnitude of the null ° interval can only be reduced. Thus, if among n consecutive symbols there is no interval longer than t- (k-I), where t is the duration of one code position, then it can be argued that there is a code vector among these symbols. Conversely, if a sequence of pulses is detected with at least one interval of length equal to or greater than t-k, this indicates that the received sequence of pulses is not a code vector. In order to unambiguously receive the code word of the cyclic code and minimize the search for synchronism, a known method of inverting one of the symbols is used here. Having asymmetrical channel, we will invert only the null symbol, and the unit one will remain unchanged. We select the first character of the code word as such a symbol. Then all transmitted code words begin with the symbol "1. In the initial state, the trigger 6 is in the zero position, so that the element And 1 is open, and the element And 3 - is closed. From the output of transmitter 10, through the Pn line, the input to receiver 12 and from there to the input of the discrete information receiving device continuously receive command pulses, as well as interference from the communication line. Through the open element And 1 they arrive at the input of the memory block 2, for which, for example, either a delay or a shift register can be used. At the same time, these pulses arrive at the input of the counter of 7 time intervals and on. input element AND 9. The second input element AND 9 receives a signal from counter 8, while, if the latter is not started, the signals through element 9 pass to its start, if counter 8 is started, then the signals through element 9 do not pass The signal at the output of counter 7 appears, if the measured interval reaches iXk, and at the output of counter 8, if the interval reaches the value Tn. The first incoming pulse from the element And 1 starts the counter 7 and through the element And 9 - the counter 8. If the next pulse from the output of the element And 1 enters an interval smaller than TC, then it starts the counter 7 again, but does not pass through the element And 9 and It does not affect the operation of the counter 8. If the next impulse comes through an interval greater than tk, then even before its arrival, after Ik after the previous start, the output of counter 7 is an impulse that stops the operation of counter 8 and most returns the device to its original state. If during the operation of the counter 8, equalHoelh, there is never an interval between input pulses equal to or greater than tk, i.e., the signal at the output of counter 7 never appears, then after ui after starting at the output of counter 8 the signal that triggers trigger 6. At the same time, the potentials from the output of trigger b close element 1 and open element 3. The characters written in the memory block 2 through the open element G come to decoder 4. In decoder 4, the received characters are decoded twice: with the same first character and with inverted ne vym symbol and in both cases, counting the number of corrections. The actual message is one that is less decoded during decoding. This message comes from the output of the decoder 4 to the decoder 5, where one of the outputs is energized, respectively. Vetuyuschy prinyat team At the same time, the signal from the second output of decoder 4 returns trigger 6 to the initial state. The device is ready to receive the next message. Decoding can be performed on a FRIEND time scale with a much greater frequency than the frequency of the input signals. Therefore, the time of paralysis of the device, determined by the time during which the AND element is closed, can be reduced to a minimum equal to the fraction of the duration and one code symbol. The same applies to decryption, which can be performed simultaneously with the search for the next command and therefore does not require additional time. The proposed device allows to increase the reliability and throughput of additive radio lines. In addition, the proposed device in comparison with the known has a smaller size and weight. Claims: The device for receiving discrete information, containing the first element AND, the memory block, the second element AND, the decoder and the decoder, as well as the trigger, are different in that, in order to increase the capacity, the time interval counter is entered. and Additional Element And, with the output of the first element And through sequentially connected first and second counters of time intervals and an additional element And connected to another input of the second counter of time intervals, the output of which through a trigger is connected to the second inputs of the First and second elements And, and another decoder output connected to another trigger input, while the gurvogo element I is connected to another input of the additional element I. Sources of information taken into account in the examination . V. P. Dmitriev. On self-siphroinzaiin discrete communications, “Radio Engineering, 1968, No. 4.