基于CHASE译码思想的PCMA信号盲分离算法

doi:10.11959/j.issn.1000-436x.2015075

摘要/Abstract

摘要：

在软输出逐幸存路径处理（SOVA-PSP）算法的基础上，提出了基于CHASE译码思想的载波成对复用多址（PCMA）信号的盲分离算法。该算法对SOVA-PSP软输出的结果进行可靠性排序，对于排序中可靠性较低的混合符号进行信号重构，通过重构信号和接收信号之间的欧式距离对比纠正其中的错误结果。仿真结果表明，所提算法与SOVA-PSP算法相比，性能有2 dB左右的增益。

关键词: 成对载波多址, 逐幸存路径处理, CHASE译码, 单通道盲分离

Abstract:

On the basis of SOVA-PSP, a novel algorithm for blind separation of PCMA signal was presented based on CHASE decoding. The results of soft output of SOVA-PSP were sorted based on reliability in the algorithm, the mixed symbols that had low reliability in the sorted results were reconstructed. Compared the euclidian distance between recon-structed signal and received signal, the wrong results can be corrected. Simulation results show that compared with the SOVA-PSP algorithm, the novel algorithm can improve the gain of about 2 dB.

Key words: pared carrier multiple access(PCMA), per-survivor processing (PSP), CHASE decoding, single-channel blind source separation

杜健,巩克现,彭华. 基于CHASE译码思想的PCMA信号盲分离算法[J]. 通信学报, 2015, 36(3): 202-207.

Jian DU,Ke-xian GONG,Hua PENG. Algorithm for blind separation of PCMA based on CHASE decoding[J]. Journal on Communications, 2015, 36(3): 202-207.

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2路相对定时偏差Δτ	SOVA-PSP（错误混合符号个数）	本文算法（错误混合符号个数）	对SOVA-PSP结果中错误纠正率
1/8T	222	99	55.4%
2/8T	119	33	72.3%
3/8T	109	16	85.3%
4/8T	129	60	53.5%

2路相对定时偏差Δτ	SOVA-PSP（错误混合符号个数）	本文算法（错误混合符号个数）	对SOVA-PSP结果中错误纠正率
1/8T	202	87	56.9%
2/8T	85	13	84.7%
3/8T	54	3	94.4%
4/8T	75	10	86.7%