SU661396A1 - Arrangement for determining pulse phase for discrete communication systems - Google Patents

Description

The invention relates to measuring TcxFuiKe and, in particular, to devices for determining the phase of a pulse in a discrete communication channel.

A device for measuring the time shift between pulsed signals is known, containing receiving channels with a sum of armatures in each channel, cross-links with dividers and an indicator, and in each channel direct and cross-linking has a sequential integrator and a detector-limiter, connected to the monopolar inputs of the adders of each channel, while the outputs of the adders through the detectors are connected to the indicator 1.

However, this device has insufficient measurement accuracy.

It is also known a device for determining the phase of a pulse in discrete communication systems, comprising a series-connected allocation unit and pulses, a decoder, a register and an information output unit, and also a synchronizer and a control unit connected to the register and an output unit, and synchronizer is connected to decoder 2.

This device measures the time interval between the received pulses on the receiving side of the LINK communication and produces T-valued code combinations corresponding to the value of this interval. The disadvantage of this device is

pulse phase uncertainty in the presence of pulsed noise. This is due to the fact that the pulse interference splits the interval between pulses into subintervals, each of which in the general case does not correspond to the transmitted code information. As a result, each impulse interference leads to a distortion of the t-valued code combination, which, with intense impulse noise, dramatically reduces the reliability of information reception and thereby negates the advantages of high information efficiency of signal pulses.

The purpose of the invention is to improve the accuracy of determining the phase of a pulse in the presence of impulse noise.

This is achieved in that the device

0 determine the phase of the pulse for discrete communication systems containing a pulse extraction unit, a serially connected decoder, a register and an information output unit, and

also interconnected synchronizer and control unit, their outputs connected to the inputs of the register and information output unit, introduced three comparison units with control intervals, three delay lines, a time selector, a pulse distributor and a switch, with the output of the pulse extraction unit through successively connected nerve block comparison with the control intervals, the first delay line and the pulse distributor are connected to the inputs of the second and third blocks of the comparison with the control intervals, one outputs which are connected directly, and others, respectively, through the second and third delay lines to the inputs of the switch, the output of which is connected to the input of the decoder, the first comparison unit with coitrol intervals, through a time selector, is connected to the pulse distributor, and the synchronizer outputs are connected to the corresponding inputs of the first, second and third blocks of comparison with control intervals.

FIG. 1 shows a functional diagram of this device for determining the phase of a pulse for discrete coupling systems; FIG. 2 - timing diagrams, according to the operation of this device.

This device contains a pulse extraction unit 1, a serially connected decoder 2, a register 3 and an information output unit 4, as well as interrelated synchronizer 5 and a control unit 6, their outputs connected to the inputs of the register 3 and the information output unit 4. In addition, the device contains three units of comparison 7, 8, 9 with control intervals, three delay lines 10, 11 and 12, time selector 13, pulse distributor 14 and switch 15.

The output of the pulse extraction unit 1 through the first comparison unit 7 connected in series with the control intervals, the first delay line 10 and the pulse distributor 14 are connected to the inputs of the second and third comparison blocks 8 and 9 with the control intervals, some of which are connected directly, and the others, respectively, through the second and third delay lines 11 and 12 to the inputs of the switch 15. The output of the switch 15 is connected to the input of the decoder 2. The first block is compared with 7 control intervals through the time selector 13 connected with the pulse distributor 14, and the outputs of the synchronizer 5 are connected to the corresponding inputs of the first, second and third blocks of comparison 7, 8, 9 with the control intervals.

The operation of this device is as follows.

On the transmission side of the communication system, pulse signals are generated, the discrete time interval between which, in accordance with the transmitted information

varies from Tto toTo + T and MAX. (Fig. 2a). A sequence of impulse signals arrives at the receiving side of the communication system distorted by impulse noise. The pulse extraction unit 1 forms a sequence of video pulses from the received signals (Fig. 26). This sequence of pulses passes through the first block of comparison 7 with control intervals, is delayed by the first delay line 10 at the time And arrives at the information input of the pulse distributor 14 (Fig. 2e).

The first block of comparison 7 with control intervals generates a noise recording signal in all cases when the interval between the passage of video pulses through it is less than To (Fig. 2c). Under the action of this signal, the time selector 13 generates a self-blocking signal with a duration T o (Fig. 2d) and, as a result,

transmits to the control input of the pulse distributor 14 only those noise registration signals, the interval between which is larger (Fig. 2e).

The pulse distributor 14 redistributes two video pulses over two channels,

5 is received after the error detection signal, with the first video pulse being sent to the first channel formed by the second comparison unit 8 with the check intervals and the second delay line 11, and the second video pulse to the second channel formed by the third comparison block 9 with the control intervals. and the third delay line 12. In the absence of the optical signal, each video pulse is directed by a pulse distributor

5 14 simultaneously in both channels (fi1-. 2g, and). The sequence of video pulses in each channel is passed through a block of comparison 8 or 9 with control intervals, delayed by the corresponding delay line 11 or 12 for the time T o + Timdr s. and

arrives at the corresponding information input of the switch 15 (Fig. 2n, m). A comparison unit of 8 or 9 with control intervals in each channel generates an error signal in all cases when the interval between the video pulses passing through it is less than TO or greater than Td + + Ti and max. (Fig. 2z, k). Error signals from the first and second channels go to the first and second control inputs of switch 15, respectively. The latter, with the arrival of an error signal from one channel, connects another channel to the input of decoder 2, which remains connected until a signal is received from it mistakes. As a result, a sequence of video pulses is formed at the input of the decoder 2, the time interval between which is always in the range of T o T0 ToTo + Ti MAX. (Fig. 2n).

Decoder 2 converts a sequence of video pulses into a sequence

m-valued code combinations. Each code combination is written to the register 3 and, under the control signals, is read from the control unit 6 by the information output unit 4.

The coordination of the work of the entire device in time is carried out by synchronizer 5.

Claims (2)

1. USSR author's certificate J 455295, cl. G 01 R 25/00, 30.12.74. 2. Works of the Institute of Electrical and Electronics Engineers. Vol. 58, No. 10, 1970, p. 341