Error code tolerance recognition method for LDPC (low density parity check) code length and code rate

Abstract

The invention discloses an error code tolerance recognition method for LDPC (low density parity check) code length and code rate, and belongs to the technical field of intelligent communication, deep space communication, satellite communication and communication detection and the like. The recognition method is characterized by taking various code lengths and code rates of LDPC in a target system as testing code lengths and testing code rates, calculating syndrome of a testing code stream section which has the same length with the corresponding testing code length from the first bit in a received code stream by the aid of calibration matrix corresponding to the testing code lengths and the testing code rates, and normalizing non-zero elements in the syndrome through the testing code lengths. If the normalized value is equal to zero, then the corresponding testing code length and testing code rate are judged to be the code length and the code rate of the LDPC to be recognized; otherwise, the testing code length and the testing code rate corresponding to the minimum normalized value obtained are determined to be the code length and the code rate of the LDPC to be recognized at the end of test. The recognition method utilizes easy implementing algorithms, and is stable in recognition performance, good in error code tolerance, and applicable to recognition of code lengths and code rates of various LDPCs.

Description

technical field [0001] The invention belongs to the technical fields of intelligent communication, deep space communication, satellite communication and communication reconnaissance, etc., and relates to the identification of channel coding parameters, in particular to error-tolerant low density parity check codes (English: Low Density Parity Check, referred to as LDPC) encoding code length and code rate identification method. Background technique [0002] In intelligent communication, deep space communication and satellite communication, due to the influence of factors such as channel and time delay, information may not reach the receiver in real time and accurately. In order to ensure the reliability of communication, the information sender needs to change the channel coding parameters in a timely manner to adapt to the change of the channel transmission environment. Under this communication system, the communication parties cannot achieve synchronous communication about ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of identification method of error-tolerant LDPC code encoding code length and code rate, to solve the problem of multi-code length and multi-code rate in the application technology fields such as intelligent communication, deep space communication, satellite communication and communication reconnaissance. Recognition of LDPC codes