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Polar-LDPC cascaded code merging BP decoding algorithm and device

A decoding algorithm and decoding device technology, which is applied in the field of merging BP decoding algorithm and device, can solve the problem of using the similarity of two-level decoders, and achieve the effect of low complexity

Active Publication Date: 2017-09-26
上海瀚芯实业发展合伙企业(有限合伙)
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Problems solved by technology

However, the predecessors failed to utilize the similarity of the two-level decoder. In this invention, we use the similarity of the BP decoding method of the two-level code to propose an innovative idea. Through the cascading of graphs, the decoding Combined into one, let the one-code cycle of LDPC and polar code be carried out sequentially, forming a complete cycle process

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  • Polar-LDPC cascaded code merging BP decoding algorithm and device
  • Polar-LDPC cascaded code merging BP decoding algorithm and device
  • Polar-LDPC cascaded code merging BP decoding algorithm and device

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Embodiment 1

[0030] A kind of merging BP decoding algorithm of polar-LDPC concatenated code, this method comprises the steps:

[0031] (1) Initialize the channel observation vector y as the probability information of each codeword through formula (1),

[0032]

[0033] In formula (1): L(x j ) is the log-likelihood ratio of each code bit,

[0034] N 0 is the average noise power of the channel;

[0035] (2) put L(s j ) is used as the information of the variable nodes on the Tanner graph, and is calculated once on the check node with the min-sum method, and the calculated value is returned to all variable nodes, and the variable nodes collect information from all check nodes connected to it ;

[0036] (3) A part of the variable nodes connected to the factor graph, take its probability information as the left information L of the rightmost (n+1) first order of the factor graph n+1,j , according to the formula (2), formula (3), formula (4) and formula (5), the factor graph calculates...

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Abstract

The present invention provides a polar-LDPC (Low Density Parity Check) cascaded code merging BP (Belief Propagation) decoding algorithm and device. The device comprises an initialization module, an iteration calculation module and a hard decision module. The initialization module comprises a multiplier configured to perform channel observation vector initialization to log likelihood ratio information; the iteration calculation module comprises a multiplier groups relative to variations of a Tanner graph and a factor graph, verification nodes, a basic calculation unit and influencing factors; and the hard decision module comprises a hard decision unit configured to obtain an decoding result. In the condition that the Polar-LDPC cascaded code merging BP decoding algorithm has the same iteration times as a traditional algorithm, the influencing factors are arranged to obtain bit-error performances being obviously better than a traditional method and have no great difference in calculation complexity.

Description

Technical field: [0001] The invention relates to a combined BP decoding algorithm and device of polar-LDPC concatenated codes, belonging to the field of computer communication. Background technique: [0002] In the AWGN channel environment, the predecessors have conducted extensive and in-depth research on the polar code and the Belief Propagation (BP) decoding algorithm of the Low Density Parity Check (LDPC) code. In addition, the concatenated code scheme has been widely studied because of its error performance and the advantage of a small safety distance. In previous studies, many different code combinations including different concatenation schemes of polar codes and LDPC codes in the present invention have been discussed. However, the predecessors failed to make use of the similarity of the two-level decoder. In this invention, we use the similarity of the BP decoding method of the two-level code to propose an innovative idea. Through the cascading of graphs, the decodi...

Claims

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Application Information

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IPC IPC(8): H03M13/13H03M13/11
CPCH03M13/112H03M13/13H03M13/1191H03M13/2906
Inventor 张川刘嘉爱景树森尤肖虎
Owner 上海瀚芯实业发展合伙企业(有限合伙)
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