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Interweaved decoding method and device for eliminating multilateral modulation symbol in BICM (Bit Interleaved Coded Modulation) system

A technology of modulation symbols and decoding devices, which is applied in the field of communication, can solve problems such as decoding performance degradation, and achieve the effect of improving decoding reliability

Inactive Publication Date: 2012-09-12
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Problems solved by technology

However, this method has limitations, that is, the improvement of this interleaving method is only applicable to occas

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  • Interweaved decoding method and device for eliminating multilateral modulation symbol in BICM (Bit Interleaved Coded Modulation) system
  • Interweaved decoding method and device for eliminating multilateral modulation symbol in BICM (Bit Interleaved Coded Modulation) system
  • Interweaved decoding method and device for eliminating multilateral modulation symbol in BICM (Bit Interleaved Coded Modulation) system

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Embodiment Construction

[0032] In order to facilitate the understanding of the present invention, the following will be described in conjunction with the accompanying drawings.

[0033] The present invention proposes an interleaving and decoding method for eliminating the multilateral modulation symbols of the BICM system, please refer to figure 1 , including the steps:

[0034] S101. Receive the bit sequence output by the LDPC encoder;

[0035] Receive the bit sequence v output by the LDPC encoder n .

[0036] S102. Form the received bit sequence into a symbol node set;

[0037] According to the receiving order, the received bit sequence is formed into a symbol node set; where, the element of the symbol node set is S j , j=1, 2, 3...n / q; that is, according to the order of codeword output, each q bit is mapped to the corresponding constellation point of the Q-dimensional constellation diagram to form a symbol node S j , corresponding to S j ={vq(j-1)+1,vq(j-1)+2,...,vqj}, where j corresponds to...

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Abstract

The invention provides an interweaved decoding method and device for eliminating a multilateral modulation symbol in a BICM (Bit Interleaved Coded Modulation) system, which comprises the following steps of: receiving a bit sequence output by a coder; forming a symbol node assembly by the received bit sequence; searching a modulation symbol comprising multiple edges to obtain a modulation symbol assembly comprising the multiple edges; judging whether the symbol node belongs to the modulation symbol assembly comprising the multiple edges; if yes, carrying out a bit exchange process; determining whether the bit number in the first assembly is more than 1; if yes, continuously carrying out the bit exchange process; if no, deleting the modulation symbol comprising multiple edges and corresponding to Sj, and judging whether the elements of other symbol node assemblies belong to the modulation symbol assembly comprising the multiple edges; outputting a bit exchange result; and decoding according to the bit exchange result. The invention also proposes an interweaved decoding device for eliminating a multilateral modulation symbol in the BICM system, and can be used in the occasions of regular LDPC (Low Density Parity Check) coding and irregular LDPC coding, and the decoding reliability of the BICM system can be improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an interleaving and decoding method and device for eliminating multilateral modulation symbols in a BICM system. Background technique [0002] With the continuous increase of the modulation order, the number of multilateral modulation symbols will continue to increase, making it difficult to further improve the decoding performance of the high-order modulation BICM system; [0003] A well-designed coding structure is the most fundamental solution to avoid the occurrence of multilateral modulation symbols, but with the change of modulation mode and the increase of modulation order, the computational complexity is also very large. At the same time, the universality of codewords is also a challenge to test the design of coding structures. Although the interleaver with a simple structure will bring a certain system delay to the BICM transmission system, compared with the code...

Claims

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Application Information

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IPC IPC(8): H03M13/27
Inventor 汪莹温柏坚蒋康明
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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