基于裁减自动球形算法的多符号差分空时译码  

Multiple-symbol Differential Space-time Secoding Based on Pruning Automatic sphere decoding algorithm

作　　者：李庆坤[1,2] 马洪光[1] 李正生[1] 王鹏毅[2] 

机构地区：[1]第二炮兵工程学院,陕西西安710025 [2]中国电子科技集团公司第54研究所,河北石家庄050081

出　　处：《计算机仿真》2010年第3期310-313,共4页Computer Simulation

摘　　要：将裁减自动球形译码算法(PASD)应用于多符号差分酉空时译码。多符号差分酉空时译码可以克服快衰落信道中常规差分空时译码的误码平层问题,但其计算复杂度和多符号窗口的长度成指数增长关系。自动球形算法是最大似然性能球形译码算法中乘加次数最少的方案,裁减自动球形算法在性能恶化很小的前提下进一步减少了该方案的计算复杂度。将裁减自动球形算法应用于多符号差分酉空时译码,可以显著的减少计算量。通过仿真表明,方案在显著减少计算量的情况下,性能的恶化很小,达到了性能和复杂度的较好折衷。In this paper, the pruning automatic sphere decoding （PASD） algorithm is applied on the multiple - symbol differential unitary space - time decoding. Multiple - symbol differential unitary space - time decoding may overcome the error floor caused by conventional differential space - time decoding under the fast - fading channels. But its complexity is exponentially increased with the length of multiple - symbol. Automatic sphere decoding is a scheme that has the least times of multiplication and plus in the sphere decoding which has the maximum - likelihood performance, and the pruning automatic sphere decoding algorithm further reduces the complexity on the condition that the performance worsen less. The computational load is reduced greatly by applying the pruning automatic sphere decoder （PASD） algorithm on the multiple -symbol differential unitary space -time decoding. The result of simulation shows that this scheme reduces the complexity obviously without much penalty of the performance. It gets the better tradeoff between the performance and the complexity.

关 键 词：裁减自动球形译码 多符号 差分酉空时译码 

分 类 号：TN941.4[电子电信—信号与信息处理]