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BICM transmission method and system for LDPC code words in specific degree distribution

A technology of LDPC code and transmission method, applied in the field of BICM transmission method and system, can solve problems such as insufficient optimization of LDPC codeword performance, and achieve the effect of good bit error rate performance

Active Publication Date: 2014-02-12
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0007] The purpose of the present invention is to provide a bit-interleaved coded modulation (Bit-Interleaved Coded Modulation, BICM) transmission method and system for LDPC codewords with specific degree distribution to solve the problem of LDPC codeword performance conforming to specific degree distribution in the prior art The problem of under-optimization

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  • BICM transmission method and system for LDPC code words in specific degree distribution
  • BICM transmission method and system for LDPC code words in specific degree distribution

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Embodiment

[0080] The structure of the above-mentioned transmission system and its transmission method will be described below through a specific embodiment.

[0081] First, according to the structure of the present invention, the LDPC encoding module 1, the bit mapping module 2 and the constellation modulation module 3 are sequentially constructed, wherein the bit mapping module 2 is provided with a writing unit 21, a replacement unit 22 and a reading unit 23. The LDPC encoding module 1 is used to perform LDPC encoding on the input data, and the encoded data is used as the input bit stream of the bit mapping module 2 .

[0082] Secondly, the bit mapping module 2 uses the writing unit 21 to input the bit stream (N ldpc length) into a storage table from top to bottom column by column, the size of the storage table is N r Row, N c List. The writing process is as figure 2 shown, where the parameter N c It is related to the modulation order, usually an integer multiple of the logarithm...

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Abstract

The invention discloses a BICM transmission system for LDPC code words in specific degree distribution. The BICM transmission system comprises an LDPC coding module, a bit mapping module and a constellation modulation module. The bit mapping module comprises a writing-in unit, a replacement unit and a reading-out unit. The writing-in unit enables output bit streams of LDPC codes to be written in a storage list by columns. A bit replacement sequence is preset in the replacement unit, and bit replacement is performed on the storage list according to the bit replacement sequence. The reading-out unit is used for reading out the sequence after bit replacement. According to the technical scheme, the BICM system of the LDPC code words which conform to specific degree distribution is optimized, and therefore, compared with the LDPC code words which are not optimized, the specific LDPC code words can have better bit error rate performance in the BICM transmission system.

Description

technical field [0001] The present invention relates to a bit-interleaved coded modulation system (Bit-Interleaved Coded Modulation, BICM) and its transmission method, more specifically, to a BICM transmission method and system for specific degree distribution LDPC codewords. Background technique [0002] One of the fundamental tasks of digital communication systems, including typical wireless mobile communication systems and terrestrial digital broadcasting systems, is to realize the error-free transmission of digital information. Bit-Interleaved Coded Modulation (Bit-Interleaved Coded Modulation, BICM) is the core technology of digital communication systems, and it is a suboptimal technical solution in the sense of average mutual information; Coded Modulation (TCM) technology, although its performance is slightly worse in Additive White Gaussian Noise (AWGN) channel, it has better performance in Rayleigh channel. [0003] The LDPC code can be closer to the Shannon limit u...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 张文军郭序峰管云峰何大治史毅俊徐胤
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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