光级联空时编码中的一种联合检测迭代译码算法  

A Joint Detection and Iterative Decoding Algorithm of Optical Concatenated Space-Time Code

作　　者：王惠琴[1,2] 王粉[1,2] 曹明华[1,2] 柯熙政[1] 

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050 [2]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《光学学报》2015年第8期49-55,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61265003;61465007);甘肃省青年科技基金(1310RJYA010)

摘　　要：介绍了光多输入多输出(MIMO)系统的信道模型,通过将低密度校验码(LDPC)高可靠性的译码结果反馈给分层空时编码(BLAST)译码器,提出了一种适合于LDPC-VBLAST光级联空时编码系统的联合检测迭代译码算法。利用蒙特卡洛方法分析了该译码算法的误码性能,并和简单级联译码算法的性能进行了对比。结果表明:这种联合检测迭代译码算法的误码性能明显优于已有的简单译码算法。另外,采用数值分析法分析了迭代次数对该译码算法性能的影响,结果表明,在折衷考虑系统误码性能和译码算法复杂度的情况下,要合理选取迭代次数,即迭代次数不宜选取过大。After introducing optical multiple input and multiple output （MIMO） channel model, by feed backing high reliability of low density parity check （LDPC） decoding results to BLAST decoder, a joint detection and iterative decoding algorithm suitable for LDPC-BLAST optical concatenated space-time coding system is proposed in this paper.Using Monte Carlo Method, the bit error rate （BER） of the proposed decoding algorithm is analyzed and compared with that of the originally simple concatenated decoding algorithm. It is showed that the BER of the proposed joint detection and iterative decoding algorithm is better than that of the existing simple decoding algorithm. Besides, the influence of iterative times on the proposed decoding algorithm performance is analyzed with numerical analysis method. The results show that the number of iteration should not be too large when the system BER and decoding algorithm complexity is eclectically considered.

关 键 词：光通信 级联编码 空时编码 联合检测迭代译码算法 

分 类 号：O436[机械工程—光学工程]