SU1297241A2 - Method of checking digital communication system - Google Patents

Abstract

The invention relates to telecommunications. Additional to the invention on the author. St. No. N92147. The purpose of the invention is to increase the reliability of the control. The essence of this method lies in the fact that during the even cycles of the formation of the Control Reference. (QoS), the reduction of QoS formed on the receiving side is monitored in comparison with the norm, and during odd-numbered cycles, the QoS increase is monitored. The goal is achieved by implementing a distinctive control over the increase in QoS to avoid the formation of spurious impulses. An example of a device that implements this method and contains encoder 1, block 2 combining, two filters 3 and 9, two ADC logarithm 4 and 10, two selectors 5 and P maximum, block 6 delay, separation block 7 decoder 8, two comparators 12 and 14, the drive 13 and the threshold sensor 15. 1 il. $ (L with to

Description

1129

The invention relates to telecommunications engineering, can be used to monitor the operability of digital communication systems to control the operability of communication channels from analog input to analog output, and is in addition to the basic one by aut. St. No. 1192147.

The purpose of the invention is to increase the reliability of the control.

The drawing shows a structural electrical {) schematic diagram of a device that implements the proposed method.

The device contains encoder 1, block 2 of the combination, filter 3, the first analog-digital transducer Q-loader-4; first maximum selector 5, delay unit 6, separation unit 7, decoder 8, filter 9, second analog-to-digital converter-logarithmator 10, second maximum selector II, comparator 12, accumulator 13, digital comparator 14, sensor. 15 threshold level.

The essence of the method is as follows.

During the even cycles of the formation of the check reference, the reduction of the check reference formed at the receiving side is monitored compared to the norm, and during odd cycles, the control of its increase is made.

The control of the increase in the reference reading formed at the receiving side is made with the following difference from the known method. On the transmitting side, a reference reading is formed by allocating the maximum reference of the signal at the output of a logarithmic ADC for the entire cycle of forming the reference reference, i.e. during T, + T4 T, + T.

At the receiving side, during the time interval T, T, located at the beginning of the cycle of forming the reference reading, the selection of the maximum is not performed, and the contents of the maximum selector are zero. The selection of the maximum at the receiving side is performed during the remainder of the cycle, i.e. in the time interval T T. Then, the control samples obtained at the receiving and transmitting sides are compared even in the case that the control reading obtained at the receiving side is larger by a certain divided value, and an impulse is formed

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an accident. Such a control of the increase in the reference sample formed on the receiving side allows you to avoid generating false pulses, causing the analog signal maximum to hit (in two adjacent cycles of forming the reference sample) due to the delay in the analog filters of the encoder and decoder, from one generation cycle reference reading to another.

A device that implements the proposed method results in an alarm signal at the output of a digital 14 comparator when the peak level of the signal at the receiving side differs from the nominal one by 4 dB up and down at the signal level at the input of the communication channel O - 28 dB.

The pre-burned method is implemented as follows.

On the transmitter side, an analog input signal is encoded with encoder 1; filter the input analog signal by filter 3; produce logarithmic analog-to-digital conversion of the filtered signal using the first analog-to-digital conversion of the W-log 4.

In odd cycles, the formation of the reference reading on the time interval T, | the sample is selected using the first selector 5 of the maximum, which has a maximum value. During the next time interval Tj, the maximum is not released. T, j, complements the time interval T, up to the value of the cycle of forming the reference reading with the help of a delay unit 6 and a combination unit 2. The time interval T is greater than the maximum group delay time of the analog filters of the communication channel. In the even cycles of the formation of the reference, the maximum reference is produced during the entire cycle, i.e. T, + T 1, + T. The received control sample is delayed by a delay unit 6 by a time equal to the delay time of the information signal in the digital equipment of the encoder 1 and the decoder 8.

This delay can be entered on the receiving side. The delayed checkout is combined in block 2 with the information signal.

31297241

At the receiving side, the reference reading formed at the transmitting side is extracted in. separation unit 7 from the baseband signal. In the event that the reference count on the transfer

The downstream side is not delayed, it is delayed by the required time, the output analog signal is filtered using filter 9; using the second analog-to-digital conversion of the l-logarmator 10, the logarithm analog-to-digital conversion of the filter signal is calculated in odd 1 digits of the control reference, using the second

maximum separator 11, which is maximized by the fact that

the maximum value for the entire T + + Tj cycle of the formation of the reference reading; in the comparator 12, the control counts obtained on the basis of the report are compared to the reporting and receiving sides, and if the control reference received in the transmission is less than the control reference received at the reception by a certain amount, an accident pulse is formed using the accumulator 13 and digital comparator 1A. In even-numbered cycles of the formation of the reference reading at the beginning of the cycle during the time interval Tj Tj, the selection of the maximum reference is not performed; the maximum is allocated on the time interval T T,

Editor B.Shvydka Order 797/62

Compiled by E.Golub Tehred L. Serdyukova

Proofreader S. She

Circulation 639 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

following Tj; compare the control readings obtained on the transmitting and receiving sides, and if the control reading received on the transmitting side is larger by a certain amount, an accident impulse is formed; counting accident pulses at a predetermined time interval; if their number is more than a certain value set by the sensor 15 of the threshold level, they form an alarm signal. Invention Formula Control method of digital communication system by aut. St. No. 1192147.0 tl and an increase in the reliability of the control, on the transmission in each even cycle of the formation of the control pulse T + cycle T4 T, + T 2 and on In the same even cycles, a report is obtained that has a maximum value in the time interval T T comparison. The signals generated in the transmission and reception of pulse sequences are determined by determining the differences between them, and in the given time interval the number of differences of the specified number is not exceeded. . Proofreader S. Shekmar