8×8半正交代数空时码的编译码方法  

Encoding and Decoding Method for 8×8 SAST Code

作　　者：田心记[1] 许焱平[1] 李亚[1] 胡紫巍[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：《北京邮电大学学报》2012年第4期55-58,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61104079)

摘　　要：为了降低8×8的半正交代数空时(SAST)编码的译码复杂度,提出了一种新的适用于正交振幅调制(QAM)的8×8 SAST编码的编译码方法.该方法在发送端根据反馈信息将部分发送信号旋转适当的角度,实现了前半部分发送信号向量及后半部分发送信号向量的实部分量和虚部分量在传输过程中保持正交,从而其译码复杂度与调制阶数的平方成正比.仿真结果显示,该编码仅需反馈5 bit就极大地降低了译码复杂度.In order to reduce decoding complexity for 8× 8 semi-orthogonal algebraic space-time code （SAST） , a new encoding and decoding method is proposed for 8×8 SAST code with QAM modulated signals. In the proposed method, through part of the transmitted signals rotated by a certain angle accord- ing to the feedback information, the real part and the imaginary part of the first half and the second half of the transmitted signal vectors are mutually orthogonal. So its decoding complexity is proportional to the square of the modulation order. Simulation shows that the decoding complexity is reduced greatly by the proposed code only with 5 bit feedback.

关 键 词：半正交代数空时编码 译码复杂度 反馈 调制阶数 

分 类 号：TN911.22[电子电信—通信与信息系统]