SU1536514A1 - Device for measuring validity of information transmission through discrete channel - Google Patents

Abstract

The invention relates to radio measurements. The purpose of the invention is to improve the measurement accuracy. The device contains a clock pulse generator 1, a sensor 2 test signals, a cyclic phasing unit 3, an installation unit 4 measurement sessions, a trigger 5, two-channel switches 6-11, a display unit 12, a sequential calculation unit / BPV / 13 dispersion, an BPW 14 of the average number of errors , binary decimal counters 15-18, delay bars 19 and 20, counters 21-24, receiver 25 test signals, clock synchronization unit 26, error detection unit 27, and session number counter 28. The goal is achieved by providing statistical processing of the test signal coming from the monitored discrete communication channel 29. According to the data obtained, the error rate and its mean value and standard deviation are determined. The device according to claims 2 and 3 of the f-ly is characterized by the implementation of BPV 13 and 14. 2 c. f-ly, 1 ill.

Description

The invention relates to a technique for measuring the transmission of digital information and is intended for statistical measurements of the loss of reliability of information in digital channels in the process of their adjustment, testing and operation.

The purpose of the invention is to improve the measurement accuracy by statistical processing.

The drawing shows a block diagram of a device for measuring the reliability of information transmission over a discrete communication channel.

The device comprises a clock pulse generator 1, a sensor 2 test signals, a cyclic phasing unit 3, a measurement session setting unit 4, a trigger 5, two-channel switches 6-11, a display unit 12, a sequential dispersion calculation unit 13, a sequential media calculation unit 14 - its number of errors, binary-decimal counters 15-18, delay elements 19 and 20, counters 21-24, receiver 25 test signals, clock glint 26, block. 27 error detection and session count 28.

The drawing also shows the monitored communication channel 29.

Block 13 of the sequential calculation of the dispersion consists of division blocks 13-1 and 13-2, adder 13-3, blocks 13-4 and 13-5 of multiplication, and block 13-6 of the subtraction, block 14 of sequential calculation of the average number of errors - blocks 14-1 and 14-2 division, block 14-3 multiplication and adder 14-4.

The device works as follows

From the sensor 2 of the test signals, controlled by the generator 1, the binary sequence of the test signal enters the monitored communication channel 29. From the monitored communication channel 29, the test signal enters blocks 3 and 26. The test sequence received from the monitored communication channel 29 and the reference test sequence from block 25 are compared in block 27. If the sequence elements do not match, the output of block 27 appears mistakes

0 5

five

five

0

0

five

0

which are recorded by the error counters 21 and 22. The error recording time of each counter (measurement session rhenium) is set by the session setting unit 4 (WCD), which represents a frequency divider with a variable division factor of 10 tons (, 2, 3, ...).

After the end of each measurement session (when the established division factor is reached), a signal appears at the output of the session setting unit 4, which is fed to the control trigger 5, to the counter 28 and through the delay elements 19 and 20 to the counters 23 and 24 and to the inputs of the two 1 channel switches 6, 8 and 10. With the same signal, the WCD 4 is set to its initial state and the measurement cycle (session) is repeated.

Each time a signal appears at the output of the BEADS, the trigger 5 is activated by controlling two-channel switches. Using a two-channel switch 6, error counters 21 and 22 are alternately recorded and alternately zeroed before errors are counted, and two-channel switch 7 provides alternate reading of measurements from the counters 21 and 22. If, for example, in one state, the control trigger 5 records the errors of the current measurement session into the counter 22, then at this time the results for the previous measurement session are read from the counter 21 to the display unit 12. When the status of the control trigger 5 changes, the errors of the counter 21 are recorded, and the measurement results are read from the counter 22.

In a similar way, information is recorded in counters 18 and 16 of blocks of sequential registration of the average value of the amount of error variance, as well as reading of information from the counters. I I

Block 14 of successive calculations of the average value of the number of errors, consisting of block 14-2, delip-1., Zn neither -, block 14-1 of division -, block

P

ka 14-3 multiply and adder 14-4 "implements the calculation function according to the formula

. n.1 2k / Јts- +,

11PP

4. L f / -.

n П LGS- "

n

where n is the number of completed

measurement sessions; Z h - the number of errors for the last, last measurement session; Z n is the average number of errors in the sample of completed measurement sessions. The given formula is convenient for ensuring consistent calculations, it is equivalent to the formula

Z

„

according to which the average number of errors is calculated over the entire set of measurement sessions, since

and

i Z.Z; -1 2LZ; + 1Z | I

n

i t

211- (J n Vl -.

n

Z-) + - Z,

n

. z +. n n

Taking into account that the average error rate for measurement sessions

TO,

 Z ". ten

-m

voui n

calculating the average value of the number of errors Zn over a sample of ended sessions, determine the average value

 osh

Average results

The values of the number of errors ZM over the measurement sessions via a two-channel switch 10 are alternately recorded in counters 18 and 16.

A two-channel switch 11 information from the counter on which the value of Z n (the last calculation) is written is read into the display device 12, and the information from the (counter on which the value of Z n is stored (the previous calculation) is read to the inputs of the blocks 13 and 14.

A sequential dispersion calculation unit 13 consisting of two division units 13-1 and 13-2, two multiplication units 13-4 and 13-5, an adder 13-3 and a subtraction unit 13-6 implements a function for calculating the dispersion according to the formula

This formula is convenient for providing 1 5 consecutive calculations and is equivalent to

0

five

one

p-1

 -L- n-1

Since: n

  one

u; -zj. "

H-1

eleven

Z; -Zn)

p-1

z -, - zn., "

+

 5 (z- & u

-zn. + zn-Sllzn .. 1H

Since the standard deviation of Szp -J G, having calculated the variance of G, it is easy to determine the standard deviation of the number of errors from

the average value of the measurement sessions, i. The results of the calculations of the dispersion of Gf n through the two-channel switch 8 are alternately recorded in the counters 17 and 15 blocks. On one of the counters is recorded the result of

the last calculation is stored in the other one (5 n, v by a two-channel information switch 9 from the counter where the last calculation result C j is read to the display device, and the information from the counter storing the previous calculation result Gn. is read by block 13-5 of block 13.

Thus, the following information is given to the display device: the number of errors (2) for the last measurement session, the average number of errors (Zh) for the measurement session for the sample of ended sessions, the variance (G) of errors for the measurement sessions.

According to this data, almost without

preliminary calculations

error rate K

Z.-10

, t

from

The average value of the error rate Kosh Zn 10 rw is the standard deviation (n - (5f of the number of errors (or KOUI) from the mean value.

Claims (3)

Invention Formula 1 "Device for measuring the reliability of information transmission over a discrete communication channel, containing a sensor of test signals, a measurement session setup unit, a trigger, a first counter, a count of sessions, serially connected clock generator, a clock synchronization unit, a receiver of test signals and a cycle phasing unit, output which is connected to another receiver input of test signals, an error detection unit connected in series, the first two-channel switch, W The second counter, the second two-channel switch and the display unit, the output of the clock generator are connected to the input of the session setup block and to the sensor input of the test signals, the output of which is the output of the device and connected to the input of the monitored channel; the output of which is connected to the input of the device which is the other input of the clock synchronization unit, and connected to the first input of the error detection unit and the other input of the cyclic phasing unit, the second outputs of the first two-channel switch The cell through the second counter is connected to the second input of the second two-channel switch, the third inputs of which are connected to the corresponding second inputs of the first two-channel switch and the corresponding trigger outputs, the input of which is combined with the input of the number of sessions, in order to improve the measurement accuracy by statistical processing , entered the first and second binary decimal counters, connected in series the first delay element, the third checker, the block sequential calculating the variance, the third two-channel switch, the third binary coded decimal counter, the fourth two-channel switch, whose output is connected to the second input of the sequential calculating dispersions second outputs five 0 five 0 five 0 five 0 five The third two-channel switch through the first binary-decimal counter is connected to the second input of the two-channel switch, the second delay element, the fourth counter, the unit of successive calculations of the average number of errors, the fifth two-channel switch, the fourth binary-decimal counter and the sixth two-channel switch, output which is connected to the third input of the sequential dispersion calculation unit and to the second input of the sequential calculation unit the average number error, the first input of which is combined with the fourth input of the sequential dispersion calculation unit, and the third input is combined with the fifth input of the sequential dispersion calculation unit and connected to the output of the second two-channel switch, the fourth output is combined with the sixth input of the sequential Discia calculation unit and the output of the number of sessions, the second outputs of the fifth dual-channel switch through the second binary-decimal counter connected to the second input of the sixth dual-channel n the switch, the second output of which is connected to the second input of the display unit, the third input of which is connected to the second output of the fourth two-channel switch, the trigger outputs are connected to the corresponding second inputs of the third and fifth two-channel switches and the corresponding third inputs of the fourth and sixth two-channel switches, output the unit for setting up measurement sessions is connected to the inputs of the first and second delay elements, to the trigger input and to the third inputs of the first, third and fifth dual-channel switches, and another output of the receiver of test signals is connected to the main input of the unit for detecting errors. 2. The device according to claim 1, wherein the sequential calculation unit of the dispersion comprises a serially connected subtraction unit, a multiplication unit, a first division unit and an adder, and a serially connected second division unit and a multiplication unit which is connected to another adder, the first input of the sequential dispersion calculation unit is the first input of the second division unit, the second input is another input of the multiplication unit, the third input is the first input of the subtraction unit, the fourth input is the second input of the second division unit, the fifth the input is the second input of the subtraction unit, the sixth input is the other input of the first division unit, and the output is the output of the adder. 3. The device according to claim 1, characterized in that the sequential calculation unit average 0 the number of errors contains the first division unit and the second division unit connected in series, the multiplication unit and the adder, the other input of which is connected to the output of the first division unit, the first input of which is combined with the second division unit, the first input of which is the first input of the sequential unit of average error calculation whose second input is another input of the multiplication unit, the third input is the second input of the first division unit, the fourth input is the second input of the second division unit, and the output is you od adder.