摘要
针对采用长约束信道编码的同频调制混合信号,提出了一种利用编码的单通道盲分离/译码迭代算法。该算法通过在盲分离过程中利用译码后反馈的符号软信息来改善分离效果,重点研究了软输入软输出盲分离、最大似然概率译码以及分离译码间的软信息交互。仿真结果表明,迭代盲分离算法相比不采用迭代的算法可获得更好的性能,对于采用(2,1,6)卷积码和随机交织的BPSK混合信号,前者进行2次迭代时可获得约2dB的信噪比增益。
An algorithm was proposed to exploit the codes in iterative single-channel blind separation and decoding of two co-frequency modulated signals with long-constraint channel codes.The output log-likelihood ratio（LLR） values of the decoder were used as a prior LLR fed back to the separator to improve the separation performance.Special emphases were laid on soft input soft output blind separation,maximum a posteriori（MAP） decoding and LLR interaction between separator and decoder.Simulation results show that the proposed algorithm can make a significant improvement in per-formance over the algorithms without iterations.For BPSK signals with（2,1,6） convolutional codes and random inter-leaving,a gain of about 2dB in signal-noise ratio can be obtained after two iterations.
出处
《通信学报》
EI
CSCD
北大核心
2011年第8期111-117,共7页
Journal on Communications
关键词
信号处理
单通道盲分离
PSP
MAP译码
signal processing
single-channel blind separation
PSP
MAP decoding
