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

A technology of LDPC code and code length, which is applied in the fields of satellite communication and communication reconnaissance, intelligent communication, and deep space communication, and achieves the effect of robust identification performance, simple implementation and good bit error resistance.

Inactive Publication Date: 2014-11-12
DALIAN UNIV OF TECH
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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

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Embodiment Construction

[0015] The specific implementation manner of the present invention will be described in detail below in conjunction with the technical solutions.

[0016] (1) Determine the code length set L={l of the LDPC code used by the target system according to the prior information 1 , l 2 , l 3 ,...,l M} and code rate set R={r 1 ,r 2 ,r 3 ,...,r K}. After the recognition process starts, load L and R into memory. (2) Utilize the generation rule of target system LDPC code parity check matrix to generate the parity check matrix storehouse H={hi corresponding to each code length, code rate j |i=1,2,3,…,M; j=1,2,3,…,K}, where hi j Indicates that the corresponding code length l i , code rate r j check matrix. After the recognition process is started, the check matrix library H is loaded into the memory.

[0017] (3) Intercept a segment of code stream with a length of N from the received code stream, requiring N≥max(l 1 , l 2 , l 3 ,...,l M ). This section of code stream is m...

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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, and relates to the identification of channel coding parameters, in particular to error-tolerant low density parity check code (English: LowDensityParityCheck, LDPC for short) coding Identification method of code length and code rate. 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 the channel co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 于明高新华杜宇峰
Owner DALIAN UNIV OF TECH
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