一种改进的准正交空时分组码译码方案  

An improved decoding scheme of QO-STBC

作　　者：肖丽萍[1] 代晓雪[1] 

机构地区：[1]燕山大学信息与工程学院,河北秦皇岛066004

出　　处：《重庆邮电大学学报（自然科学版）》2011年第5期562-564,569,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：针对传统全速率准正交空时分组码(quasi-orthogonal space-time block code,QO-STBC)译码复杂度高的问题,提出一种改进的准正交空时分组码译码方案。该方案通过在接收端乘以信道矩阵的共轭转置及Givens旋转矩阵,消除检测矩阵部分干扰项,使检测矩阵三角化。和传统的准正交空时分组码最大似然译码算法相比,该译码算法将最大似然判决式最简化,译码复杂度被降到最低。理论分析和仿真结果表明,改进的译码方法在保证误码率性能的同时,降低了译码复杂度,提高了译码速度。As to the high decoding complexity of the conventional full rate quasi-orthogonal space-time block code （ QO-ST- BC）, an improved scheme was proposed in this paper. In the receiver, we apply Hermitian transposition of channel matrix and Givens rotation to eliminate part of interference terms, and achieve a triangle detection matrix. Compared to conven- tional QO-STBC, the maximum likelihood （ML） metric is maximally simplified, thereby decoding complexity is mini- mized. Theoretical analysis and simulation results show that the improved scheme ensures the BER of the conventional ML decoding, and reduces the decoding complexity greatly.

关 键 词：准正交空时编码 最大似然 Givens旋转 

分 类 号：TN911.22[电子电信—通信与信息系统]