SU1501294A1 - Method and apparatus for measuring errors in digital data transmission channel - Google Patents

Abstract

Io to radio engineering. The purpose of the invention is to increase the reliability of the result when measuring in a digital data transmission channel with phase modulation. The essence of this method is explained by a device containing rc 1 PRSP, digital data transmission channel 2, clock recovery frequency unit 3, shaper 4 pulses, counter 5, memory block 6, subtraction unit 7, calculator 8 difference module, accumulating adder 9 and indicator 10. An increase in the reliability of the measurement result is achieved due to the possibility of taking measurements without knowing the phase of the carrier frequency and the initial phase of the memory bandwidth. 2 sp.f-ly, 1 ill.

Description

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The image of the OTHOCMITCH is to lajuiciTex and iiMiMiHO to the devices (T1 1st, -1m and sea naishOok to digital 11 (1m to. IiepcMiachi; i,; iHiiiiix, and may be) length HciCTpofiKH and protrrki 1.:amsm t-pepnyu indicators of equipment sttzi and trans ;; data data (for example, demodi-jiifTopa),

Ce.1p of the invention increase the accuracy of the cut: measurement when measured in a fictron data channel with phase modulation.

In the drawing, a prestaplet is a structural electrical circuit of an organizer implementing a measuring method (ii: ni6oK n digital transmission channel d ,.

A device for implementing the method comprises a PSI generator 1, a digital transmission channel 2 transmission, a clock BFU block 3, a pulse shaper A, a counter 5, a memory block 6, a subtractor 6jroK 7, a difference modulator 8, an accumulator GG adder 9 indicator 10.

The device for reactivation of the proposed method is as follows.

The statistical property of the pseudo-random impulse sequences (I) of the maximum scale is used - the equality of the number of zero and single bits on the second, jiaB cycle of the memory bandwidth. According to the proposed; -Ai method, it is proposed to count the pulses of a single 1A) l capacitance (single or zero). If there are no errors in the result of the counting in the SRP cycle, the number of pulses equal to and is obtained. multiple of the reference number of pulses of the o.tuioii polarity in the SRP cycle. Any error leads off; pio from the mtalon number of pulses, with this (m MvijiyJib, the difference between the reference and the resulting number gives the same numerical result.tat (number of op. H), as in the other ways of measuring errors. At the same time, increasing the accuracy the result is achieved due to the possibility of carrying out measurements without knowing the phase of the carrier frequency and on a single D101 (PSP phase.

Peretchche form PSP with. using the generator 1. Under the influence of noise in the channel, pulse of the memory bandwidth of the claim, 1kchch I. and bls1ke 3 of the received 1: ig. g: 11 posgtanatig (a10t with the clock tact of the ch. part 1 - you, as well as rrt L

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T011YY enters 1P1formatniy1,11 | an input (the counter 5, which is reset by a strobe pulse once per cycle of the memory bandwidth. The code for the number of pulses obtained in the meter is fed to the input of block 7, where time is determined, between the specified number and the reference value, the modulus of the obtained spacing is calculated. In block 8. The differences obtained in the analysis interval are summarized in block 9, the accumulated number of which corresponds to the number of errors in the interval being analyzed.The result is displayed on the indicator 10.

Claims (2)

1. A method of measuring errors in a digital data transmission channel, concluding that the pseudo-random pulse sequence (PRS) is formed, is transmitted through a digital channel. W data transmission, receive transmitted by the SRP. count the number of errors for the analyzed time interval, which is the fact that, in order to increase the reliability of the result when transmitted from the digital data transmission channel with the phase modulus D1, the received number of pulses is counted polarities in each cycle of the memory bandwidth, from which the number of pulses is subtracted, equal to the number of pulses of one polarity in the cycle. PSP in the absence of errors, remember the obtained {differences, the calculation of the number of errors in the analyzed time interval is carried out by summing the differences obtained in each cycle of the PSP. 2. A device for measuring errors in a digital data transmission channel, comprising a serially connected PSP generator, digital transmission of data transmission, a clock recovery unit and a pulse shaper, a counter, an indicator, characterized in that a memory block is inserted, 11 sequentially, a dipenne 1 e block you shantip; the first the input of which is connected to the output of the counter, the calculator of the difference module and the accumulating accumulator, the input of which is connected to the input of the indicator, and the input Reset is connected to the output of the pulse former and the output of the counter, the information HhUf input of which is connected to the output 5150129 46 The clock recovery unit is connected to the forging input, the output signal of the clock frequency of the pulse bodies.