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Encoding/decoding method of multidimensional crossing parallel cascade single-parity check code

A single parity check and parity check technology, which is applied in the field of channel error correction coding, decoding, and multi-dimensional cross-parallel concatenated single parity check code, can solve the problems of high error floor and poor coding gain, etc. Achieve the effect of good bit error rate performance and convenient and flexible encoding rate

Inactive Publication Date: 2009-01-14
XIDIAN UNIV
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Problems solved by technology

However, this coding structure has a high error floor, and its coding gain is poor in the region of high SNR

Method used

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  • Encoding/decoding method of multidimensional crossing parallel cascade single-parity check code
  • Encoding/decoding method of multidimensional crossing parallel cascade single-parity check code
  • Encoding/decoding method of multidimensional crossing parallel cascade single-parity check code

Examples

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Embodiment

[0066] The coding example of the present invention is as follows:

[0067] In the first step, according to the length of the input information bit stream required by the channel coding system K=1000, and the length of the output bit stream required by the channel coding system N=2000, the parameters of the coding device are set as follows: coding rate R=K / N=1000 / 2000=0.5, the length of the input information bit frame U K=1000, the length of the output code word C is N=2000; the number of interleavers M=5; the number of single parity code encoders P=5; The number of parallel branches formed by each interleaved information bit frame is k=PR / (1-R)=5×0.5 / (1-0.5)=5.

[0068] The second step is to input the input information bit frame U with a length of 1000 into 5 interleavers, and the 5 interleavers respectively output the interleaved information bit frame The interleaving rules of the five interleavers in this embodiment are: the first interleaver maintains the original order of each...

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Abstract

The invention discloses a coding method for multi-dimensional crossing parallel cascade single-parity check code comprising that input information bit frame is separately passed through M interweavers and serial to parallel conversion then enters into crossover; output of crossover generates parity check bit frame P by passing P single-parity check encoder; U and P constitutes code word C; encoder computes code word C channel prior information according to receiving signal; U channel prior information is separately interweaved by M interweavers to get M channel prior information of interweaved information bit frame and first generation iteration coding; encoder executes iteration coding and simultaneously executes local coding, then gets outer information of M interweaved information bit frame, and computing prior information of next iteration; judging logarithm likelihood ratio information for U, obtaining coding result. The invention has merits of simple encoding and coding, low error floor and is used for correcting error of receiving signal.

Description

Technical field [0001] The present invention belongs to the field of communication technology, and relates to channel error correction coding technology, in particular to a multi-dimensional cross-parallel concatenated single parity check code coding and decoding method, which can be used to correct received signal errors. Background technique [0002] In modern digital communication systems and digital storage systems, unsatisfactory channel transmission characteristics and the presence of noise will cause errors in the received signal at the receiving end. Channel error correction coding techniques are usually used to solve this problem. [0003] In modern channel error correction coding technology, Turbo codes and low-density parity-check LDPC codes are the two most important codes. Studies have shown that both Turbo codes and LDPC codes have performance close to the Shannon limit under long packets. The coding structure of Turbo code is simple, but the decoding complexity is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 陈彦辉郭凯李建东
Owner XIDIAN UNIV
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