Low complexity suboptimal decode algorithms for quasi- orthogonal space time block codes  

基于低复杂度次优译码算法的准正交空时分组码（英文）

作　　者：李正权[1] 吴名[1] 沈连丰[1] 王志功[2] 贾子彦[1] 

机构地区：[1]东南大学移动通信国家重点实验室,南京210096 [2]东南大学射频与光电集成电路研究所,南京210096

出　　处：《Journal of Southeast University(English Edition)》2016年第1期1-5,共5页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.61571108;61201248);the Open Research Fund of National Mobile Communications Research Laboratory of China(No.2011D18);China Postdoctoral Science Foundation(No.2012M511175)

摘　　要：Due to the high complexity of the pairwise decoding algorithm and the poor performance of zero forcing（ ZF） /minimum mean square error（ MMSE） decoding algorithm, two low-complexity suboptimal decoding algorithms, called pairwisequasi-ZF and pairwise-quasi-MMSE decoders, are proposed. First,two transmit signals are detected by the quasi-ZF or the quasiMMSE algorithm at the receiver. Then, the two detected signals as the decoding results are substituted into the two pairwise decoding algorithm expressions to detect the other two transmit signals. The bit error rate（ BER） performance of the proposed algorithms is compared with that of the current known decoding algorithms.Also, the number of calculations of ZF, MMSE, quasi-ZF and quasi-MMSE algorithms is compared with each other. Simulation results showthat the BER performance of the proposed algorithms is substantially improved in comparison to the quasi-ZF and quasiMMSE algorithms. The BER performance of the pairwise-quasiZF（ pairwise-quasi-MMSE） decoder is equivalent to the pairwiseZF（ pairwise-MMSE） decoder, while the computational complexity is significantly reduced.针对成对译码算法复杂度高及迫零/最小均方误差算法性能较差等问题,提出了一种pairwise-quasi-ZF/pairw ise-quasi-MMSE的低复杂度次优译码算法.利用quasi-ZF或quasi-MMSE算法计算出部分发射信号的统计判决值,将该判决值作为译码结果代入成对译码算法表达式中,从而计算出剩余部分发射信号的统计判决值并作为译码结果.比较了所提算法与几种传统译码算法的系统误比特率性能,并比较了ZF,MMSE,quasi-ZF和quasi-MMSE四种算法的计算量.仿真结果表明所提算法的BER性能与quasi-ZF算法和quasi-MMSE算法相比有明显改善,与pairwise-ZF和pairwise-MMSE算法相比BER性能相近,计算量却大大降低.

关 键 词：quasi-orthogonal space-time block code（QOSTBC） low-complexity decoding pairwise-quasi-ZF pairwise-quasi-MMSE bit error rate（BER） 

分 类 号：TN911[电子电信—通信与信息系统]