SU141180A1 - Method for statistical analysis of binary communication channels - Google Patents

Description

The known method of statistical analysis of binary communication channels is based on comparing received code elements with control signals by means of synchronously operating recurrent signal sensors, an analyzer circuit, and a magnetic signal recording unit of a distorted signal. When using such a method to obtain the data necessary for evaluating the effectiveness of various correction codes, a number of tests of these codes have to be performed.

Simplification of the process of obtaining data necessary for estimating codes and increasing the total amount of information as a result of a single test of the communication channel is achieved in the proposed method by recording errors and correctly received code elements into separate tracks of a magnetic tape with subsequent statistical processing of information using distributors shifting registers and error counters and correctly received code elements.

To clarify the described method, the drawing shows a block scheme of the analyzer of binary communication channels.

The received signals via a trigger / arrive at the pulse recorder 2, containing two logical cells 5 and 4. Cell 3 is used to register “O, and cell 4 to register“ 1. Signals from the output of recorder 2 are fed to analyzer 5, which contains four cells, 7, S, and 9 logical multiplication. Analyzer 5 compares the signals received from the recorder 2 with the control signals from the trigger W.

If there are no errors, the signal "O passes through cell 8 and. Leads to clamp 11, and the signal" 1 passes through cell 9 and goes to terminal 12. For errors corresponding to the transformation "O to" 1, the signal passes through cell 7 and goes to clamp / 5, and when transforming "1 into", the O signal passes through cell 6 and leads to clamp 14. Terminals //, 12, 13 and 14 are connected to recording No. 141180-2 with the two heads of a multi-track magnetic recording unit not shown in the drawing . Thus, erroneous and correctly received code elements are captured on the four tracks of the magnetic tape. On the fifth track, synchronizing pulses are recorded, fed through cell 15 to terminal 16, to which the fifth recording head is connected, also not shown in the drawing. Synchronizing pulses provide the ability to start the counting of code groups from any element during static processing recorded on a magnetic tape of information.

The control signals are generated by a recurrent sensor containing two registers 17, 18, a frequency divider 19 with a division factor of five, a delay line 20 and 21, an adder 22 and a cell 23. In one of the cells of the register 17 is written "1. When the information recorded in the register 17 is advanced from right to left, this information is transmitted to the cells of the second register 18. Information in the second register 18 moves with a frequency equal to the speed of wiring, and in the first register 17 with a frequency five times smaller. Simultaneously with the transfer of information from register 17 to register 18, pulses from the first and third cells of register 17 are sent to adder 22, from which, via delay line 21, the result of summation is entered into the squared cell of register 17, with the result that in register 17 will be in a certain sequence all five-element combinations, except 00000, are formed. Five-element combinations are transmitted to the second register 18 every five clock cycles.

In order to eliminate the uncertainty in the operation of the output trigger 10, the output of the register 18 includes a cell 23 having two outputs. The voltage pulse occurs at one of its output when reading "1 from the first cell of register 17, and at the second output - when reading from" O. The terminals 24 of this cell are supplied with the voltage taken from the phase correction circuit 25 connected at the output of the master oscillator 26. To provide common-mode operation of a recurrent pilot signal sensor with a similar sensor at the transmitting end of the communication channel, an automatic starter unit 27 containing a counter 28 eight pulses, trigger 29 and cell 30.

A group of nine units, formed by a recurrent sensor, is used as a trigger. When the analyzer is connected to the binary communication channel under test with the key 31, the signals "1." Begin to arrive at the input of the counter 28 from cell 4. If the number of additional units of the following units is less than nine, then the signal “O, coming from the output of cell 5, will set the counter 25 to the initial position. When receiving a sequence of nine units at the output of the counter 28, there is a pulse that will overturn the trigger 55. The pulse from the output of the 2P flip-flop will open cells 15 and 30. Pulses from the output of the circuit 25 to the clamp 16 will pass through the cell 15, and through the cell 30 clock pulses controlling the operation of a recurrent pilot signal sensor. The recurrent sensor is reset to its initial position by means of an installation unit 32 containing a cell 33, a trigger 34 and a cell 35, five outputs (36-40) of which are connected to the outputs of the register cells 17.

During the test channels in parallel to the terminals 13 and 14 connect the counters 41 and 42, which serve to count the errors that occur during the transformation of "O in" 1 and "1 in" O. Statistical processing of information recorded on a tape is carried out with the help of distributors shifting registers controlled by signals,