一种降低MIMO-OFDM信号峰平功率比的改进算法  

An Improved Algorithm for Peak-to-Average Power Ratio Reduction in MIMO-OFDM Systems

作　　者：张慧[1] 颜彪[1] 陈斗[2] 杨银霞[1] 

机构地区：[1]扬州大学信息工程学院,江苏扬州225009 [2]湖南铁路科技职业技术学院,湖南株洲412000

出　　处：《通信技术》2009年第3期67-69,共3页Communications Technology

摘　　要：子块逐次变换法(SST)是MIMO-OFDM系统中降低信号PAPR的一种有效方法,充分利用空域自由度。但是,SST没有考虑子块在频域的自由度。针对这一问题,文章提出了一种改进的SST算法(Improved SST,ISST),不仅在空域上子块做与SST相同的变换,而且在频域上同一天线上的子块也逐次旋转,既充分利用空域上所有天线的自由度,又利用频域自由度。仿真结果表明,提出方法的PAPR降低效果要明显优于SST,而且M越大优势越明显。Subblock Successive Transform （SST） algorithm is an effective method for reducing the PAPR of the MIMO-OFDM signals, and could fully utilize the degrees of freedom in space domain .However, the degrees of freedom in frequency domain are not considered in SST. For this problem, an Improved SST（ISST） algorithm is proposed in this paper. Not only the same transform as SST is done on subblocks Subblocks in space domain, but also subblocks on the same antenna are successively rotated in frequency domain. So it can fully use the degrees of freedom both in space domain and in frequency domain. Simulation results indicate that the effect of PAPR reduction by proposed method is obviously better than by SST. Furthermore, as the number of subblocks M become bigger, this superiority is more evident.

关 键 词：多输入多输出正交频分复用系统 峰平功率比 子块逐次变换法 

分 类 号：TN914.4[电子电信—通信与信息系统]