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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。
Sub-block successive transformation (SST) is an effective method to reduce the signal PAPR in MIMO-OFDM systems, making full use of spatial degrees of freedom. However, SST does not consider the degree of freedom of sub-blocks in the frequency domain. In response to this problem, an improved SST algorithm (Improved SST, ISST) is proposed, which not only performs the same transformation as the SST in the airspace, but also rotates the sub-blocks on the same antenna in the frequency domain successively Take full advantage of the freedom of all antennas in the airspace, and use the freedom of frequency domain. The simulation results show that the PAPR reduction effect of the proposed method is obviously better than that of SST, and the larger the M is, the more obvious the advantage is.