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

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

Inactive Publication Date: 2012-07-25
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

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Embodiment

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

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

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

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

Claims

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Application Information

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