SU403092A1 - DEVICE CONTROL DISCRETE CHANNEL OF COMMUNICATIONS - Google Patents

Description

one

The invention is related to the field of telegraph communication and can be used in communication systems used to transmit discrete information of frequency-manipulated signals.

A device for monitoring a discrete communication channel with a frequency-controlled signal manipulation is known, which contains shear frequency switching paths connected to a decision circuit, and a comparison circuit with the signal averaging circuit and the interference averaging circuit connected to its inputs.

In order to increase the accuracy of control in the proposed device, the paths for receiving shear frequencies are additionally connected through a sample driver to a distributor whose outputs are connected to averaging and interference schemes, with the output of the decision circuit being connected to the additional distributor input.

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 - stress diagrams for his work.

The controller of the discrete communication channel contains a decision circuit 1, sample drivers consisting of electronic switches 2, 3 and peak detectors 4, 5, driver 6 clock pulses, driver 7 discharge pulses, and a distributor consisting of ecuctor keys 8 -11, sche2

The signal averaging circuit 12, the interference averaging circuit 13, and the comparison circuit 14.

When using frequency-manipulated signals for transmitting discrete ip formations at each time interval with a duration of an elementary signal, a signal acts in one of the receiver shift paths. In other paths, interference occurs at this time. As a result, it is possible to use the information about the levels of interference and signal to estimate the quality of the link channel.

The device works as follows.

At the moments of operation of clock pulses from the output of the generator of 6 clock imulses, electronic switches 2 and 3, connected to the paths of the shift frequencies, are opened, and at the outputs of peak detectors 4 and 5

voltages are set that are proportional to the input signal and interference patterns. This is due to the choice of a constant charge time circuit of each peak detector, which ensures the establishment of the charge during the clock pulse. either due to the use of a more inertial value of charge with a longer time constant, but allowing for a linear increase in the number of

Duration of clock HMiiv.ibca.

Between the steps of the receiver's reception on the electronic keys 8-11 rasde / shte, signals of a direct solution to the information channel are received, KOTopiiiMM opens one of the ia.p keys (keys 8, 11 or 9, 10).

Depending on the nature of the received pcI1en1g on the signal acting at the receiver input, the averaging circuit 12 and the averaging interference circuit 13 receive rectangular nmnulses, whose areas are proportional to the signal levels and interference. Averaging rectangular impulses with the same duration and amnlitude, proportional to the input and voltage, does not alter the initial distribution of the amplitudes, since the initial random value (amplitude) differs from the randomly generated value (pulse area) by a constant value. Therefore, the evaluation of the transformed random variable has all the properties of the original random variable.

Further, by comparison circuit 14, a continuous 0mex comparison is made and, depending on which of the T levels re-occurs, one of the two channel state decisions is issued. At the same time, the threshold boundary between one and the other state of the channel is specified by means of time and averaging schemes and interference with transmission coefficients.

The evaluation of the conditions performed by the proposed device may be efficient due to erroneous decisions of the receiver.

If there is a small probability of an erroneous signal, the signal from the estimate from 3 to 1 is the value of 10. The deviation does not become

It is significant in the case of partial errors, in 1 the next e. If possible, the registration and analoge are erroneous. The probability of obtaining and deciding the state of the channel depends on the threshold ratio and cng al / disturbance, since this determines the max 1 l 1 o to the degree of displacement, state and. Therefore, it is necessary to reduce the likelihood

registration of a false state, the choice of the threshold value of the ratio and the signal / number can be made in accordance with the conditions for the correct reception of information and with the agreement of the m with the permissible probability

and obtaining an erroneous decision about the state. these conditions are from specific statistical distributions and interference in the channel, as well as from characteristics of the resistance to receive information.

Subject matter of i

A discrete communication channel control device with frequency manipulation, containing paths for receiving shear frequencies, connected to a decision circuit, a comparison circuit, to the inputs of which are connected an averaging circuit and a signal and an averaging circuit numberme, characterized in that 1trol, the paths of acceptance of the donor frequencies are a donor about 1 Odkey b through the samplers to the distributor, the outputs of which are equal to the signal averaging and firing, and to the additional INPUT of the distributor, the output of the circuit.

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