SU847519A1 - Method of measuring error coefficient in discrete channel - Google Patents

Description

moreover, the value of a is chosen an integer ranging from 2 to 500 / p. In an apparatus for carrying out the method, comprising in the transmitting part a data block generator, the output of which is connected to the discrete channel input through a coding unit, and a decoding unit sequentially connected to the output of the discrete channel and the error counter, which input combined with the input of the counter of the error groups and the serially connected decision block and the indicator; a counter of the number of received blocks, a decoder zero and two switches are entered; The side is connected to the first input of the decision block and to the input of the zero decoder, the output of which is through the first and second switches, to the combined second inputs of which a constant single signal is connected, respectively, to the second and third inputs of the decision block, an additional output of the decoding α-block via a received number counter These blocks are connected to the third input of the first switch, the output of the error group counter is connected to the third input of the second switch, to the combined second inputs of the error counter, the group counter of the error A reset signal is given to the counter and the number of received blocks, and the decision block is designed as an error coefficient calculator.

The drawing shows a structural electrical circuit of the device implementing the proposed method.

The device contains a shaper 1 information blocks, a coding block 2, a decoding block 3, an error counter 4, an error group counter 5, a decision block €, an indicator 7, a counter 8 the number of received blocks, a decoder 9 zero, switches 10, 11.

The device works as follows.

In the initial state, when there is no transmission, counters 5 and 8 are reset. Switches 10 and 11 connect their outputs to a constant signal. As a result, regardless of the state of the counters 8 and 5, the output of the decision block 6 will result in GROWTH 0,

The device is in its initial state after the signal has been given Reset, which sets 4,5,8 O on all counters before the signal comes from the channel.

When signals corresponding to the clock synchronization of the received information arrive, signals with a period equal to the block duration appear at the output of counter 8. The state of the other blocks does not change.

After the arrival of the first signal I, the first block with detected: .1 and errors) counter 4 goes out of the zero state, which is noted by the decoder 9 controlling the switching of the commutators 10, 11, according to the signal of which the switch 11 connects its output to the counter 8, and the switch 10 to the counter 5. After the arrival of the first signal, the formation and counting of the number of pairs of blocks begins, in one of which errors are detected.

The sequence of blocks with detected errors directly and after a delay of a block length of 5 counter 5 enters through the switch 10 to the decoder 9. The output pulses of the decoder 9 count the counter 5.

Based on the calculated values of 0 N, N and N 2 and a given value of n (block length in bits), decision block 6 performs the algebraic actions necessary for the calculation.). The calculated DIMP value from the output of decision block 6 is fed to indicator 7, where it is displayed in a convenient form for further use.

The proposed method and device are intended to be used in conjunction with discrete information transmission devices in hardware, protected codes with error detection. In this case, the probability of errors per bit is monitored at the receiving side, either directly during the reception of useful information or, if no useful information is transmitted, during the reception of the test. In the duplex information exchange mode, simultaneous monitoring of both directions is possible. Improving the accuracy of measurement of the GROCH is provided by simultaneously analyzing two parameters of the received error model in a discrete channel instead of one. The use of the method and device is particularly advisable at message switching centers in control equipment.

Claims (1)

Invention Formula The method of measuring the error rate in a discrete channel, including on the transmitting side the formation of blocks of information of fixed length, coding them with a code that detects errors, and transmitting on a discrete channel a sequence of code blocks of length n bits, and on the receiving side decoding the received blocks, counting N blocks with detected errors, counting the total number of N received blocks and calculating the value of k — an error coefficient that differs