准正交空时分组码的研究  

Quasi-orthogonal Space Time Coding

作　　者：李轩[1] 邵朝[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,西安710061

出　　处：《计算机与数字工程》2015年第10期1780-1785,共6页Computer & Digital Engineering

摘　　要：随着无线通信业务的发展,可用的频谱资源越来越紧张,如何有效地提高系统的频谱利用率成为通信发展的焦点。空时编码是一种结合信道编码和分集的新型的编码和信号处理技术,它能够在不牺牲带宽的情况下有限接近MIMO系统的理论容量和实现全速率,有效地抵抗了衰落问题。论文首先研究了正交空时分组码的编译码算法,其次针对复信号的星座图,速率为1的正交设计仅存在于两根发射天线中,为能在多发天线中实现高速率传输,重点研究了全速率准正交空时分组码和基于全速率满分集的星座图旋转的准正交空时分组码,并给出了不同调制方式下的最优旋转角,最后通过仿真比较了其性能。With the development of the wireless communications industry,the available spectrum resources are in increasingly tension.How to improve the system spectral efficiency has become the focus issue of the wireless communication＇s development.Space-Time coding,which is a signal processing technique that combines channel coding with antenna diversity,can close to the theory capacity of MIMO systems limitly and achieve the high-speed data rate with no need of additional bandwidth and effectively resist the fading in mobile communications.In the paper,firstly the encoding and decoding algorithms of orthogonal space-time coding are studied.However,as for complex signal constellation,the rate of 1orthogonal design only exists in two transmit antennas.In order to apply the rate of 1orthogonal design to any antennas,this paper focus on full-rate quasi-orthogonal space-time block coding and full-rate full diversity quasi-orthogonal space-time block coding based on the constellation rotation,and also give the optimal rotation angle with different modulation.Finally its performance is verified by simulation.

关 键 词：正交空时分组码 准正交空时分组码 全速率 满分集 

分 类 号：TN911[电子电信—通信与信息系统]