METHOD FOR CONTROLLING QUALITY OF COMMUNICATION CHANNEL Russian patent published in 2008 - IPC H04B17/00 

FIELD: communications engineering.

SUBSTANCE: in accordance to the method, at transmitting side the message is encoded using interference-resistant code, which is then transmitted into communication channel, at receiving side the interference-resistant code is decoded and, in case of successful decoding, number of errors is determined in measured words of interference-resistant code, then error coefficient is computed for communication channel as a ratio of number of errors to number of code symbols. In case of decoding refusal the message, encoded by interference-resistant code, is transmitted again. In case of successful decoding of repeatedly received code the restored message at receiving side is again encoded by the same interference-resistant code, then bitwise modulus two total is computed for first and second received codes and restored code and series of errors are produced in received interference-resistant codes, then number of errors in these series is computed and error coefficient in communication channel is determined as a ratio of number of errors to doubled number of symbols of interference-resistant code. In case of interference-resistant code decoding refusal, during its repeated transmission, the first and second received codes are added bitwise by modulus two. Then the number of errors in resulting series is computed, and error coefficient is determined as ratio of number of errors to doubled number of symbols of interference-resistant code.

EFFECT: increased precision when controlling quality of communication channel.