Star-QAM调制在STBC-SM系统中的应用和拓展  

Application and Development of Star-QAM Modulation in the STBC-SM Scheme

作　　者：华玉浩 王媛[1] 金明录[1] 

机构地区：[1]大连理工大学信息与通信工程学院,辽宁大连116024

出　　处：《信号处理》2015年第12期1658-1664,共7页Journal of Signal Processing

摘　　要：空间调制(SM)系统这些年来受到人们的关注,它克服了MIMO系统的一些缺点,同时又比SIMO系统具有较高的传输率。为了提高空间调制系统的分集增益,有学者把空时编码技术应用在空间调制系统中,提出了STBC-SM系统。另外,有学者针对SM系统,对星座图上进行研究,提出了star-QAM调制,其误码性能优于传统的PSK调制和QAM调制。然而,仿真发现star-QAM调制与STBC-SM系统结合并没有取得期望中的性能提升。因此,本文提出了一种针对STBC-SM系统的简化star-QAM调制方式,在STBC-SM系统的不同码本中分别应用双层star-QAM调制的内环与外环星座图,以此增大了STBC-SM系统的最小编码增益距离(CGD),提高了系统的性能。本文还给出了简化star-QAM调制中内环与外环星座图半径的选择标准和性能分析。最后计算机仿真表明简化star-QAM调制确实提高了STBC-SM系统的BER性能,证实了简化star-QAM调制的可行性和有效性。The spatial modulation（ SM）,which overcomes several drawbacks of the MIMO system and obtains a higher spectral efficiency compared with SIMO system,has received much attention recently. And the STBC-SM was proposed by combining the STBC with SM to obtain a better performance. Furthermore,some researchers proposed the star-QAM modulation for SM,which has a better BER performance compared with PSK and QAM modulation. However,the STBC-SM with star-QAM modulation does not have a better BER performance as expected. Consequently,a simplified star-QAM modulation is proposed in this paper,which applies each ring of constellation point of star-QAM in the different STBC-SM codebook to increase the minimum coding gain distance（ CGD）. The performance analysis and the standard to design the simplified star-QAM modulation are also presented in this paper. Finally,the simulation results show the performance advantages of the STBC-SM scheme with simplified star-QAM.

关 键 词：空间调制 空时分组码 star-QAM 最小编码增益距离 

分 类 号：TN929.5[电子电信—通信与信息系统]