一种改进的广义正交空时分组码  

Improved extending orthogonal space-time block coding

作　　者：田心记[1] 倪水平[1] 宋成[1] 赵伟[2] 

机构地区：[1]河南理工大学计算机科学与技术学院,河南焦作454000 [2]北京邮电大学信息与通信工程学院,北京100876

出　　处：《西安电子科技大学学报》2012年第4期161-166,共6页Journal of Xidian University

基　　金：国家自然科学基金资助项目(60872149)

摘　　要：广义正交空时分组码由多个相同的正交空时分组码组成,然而该编码的设计未能考虑到每个正交空时分组码的各支路对应的信道衰落系数,因而其性能还有提升的空间.针对此问题,提出了一种改进的广义正交空时分组码,将部分正交空时分组码的各支路信号分别旋转适当的角度.这些角度由接收端以最大化等效信道增益为目标而设计,因此,增大了系统的等效信道增益,提高了系统的性能.理论分析及仿真表明,该方法只需增加很少的反馈量就能显著提高系统的性能,且极大地降低了接收端计算反馈信息的复杂度.The extending orthogonal space-time block code is constituted by the identical orthogonal spacetime block code （OSTBC）. However, the channel fading coefficient of each branch of each OSTBC is not taken into consideration, and the performance of the extending orthogonal space-time block code can be improved further. For this problem, an improved extending orthogonal space-time block code is proposed, in which a proper rotation is set at each signal of branches of some OSTBCs. Since the rotation angles are designed to maximize the effective channel gain, the effective channel gain is increased and the performance is improved. Analysis and simulation show that the system performance is improved, and that the computational complexity is also greatly reduced with only a few bits increase in feedback information.

关 键 词：空时分组码 信道增益 反馈 计算复杂度 

分 类 号：TN929.5[电子电信—通信与信息系统]