一种改进的分解独立选择映射法

An improved method of decomposed individual selected mapping

针对多输入多输出正交频分复用(Multiple Input Multiple Output-Orthogonal Frequency Division Multiple-xing,MIMO-OFDM)系统中高峰均值比所引发的问题,提出一种改进型分解独立选择映射法对其加以解决.改进方法结合原有分解独立选择映射法与空时分组码(Space Time Block Code,STBC)特性,通过将信号实部与虚部分离、旋转,并进行快速傅里叶变换(Inverse Fast Fourier Transform,IFFT),再重新组合,进行天线相位因子映射,来减小峰均值比。借助Matlab所进行的仿真结果显示,改进方法比原有选择映射法具有更小的边带信息和更有效的峰均值比效果。

To solve the problems initiated by the high peak-to-average power ratio（PAPR） in MIMO-OFDM system,an improved method of decomposed individual selected mapping is proposed by integrating the original method with space time block coding（STBC）.According to the improved method,the signals are decomposed into real part and the imaginary part,then rotated,and recombined after an inverse fast Fourier transform（IFFT） being done,moreover,the antenna phase factor mapping method is employed,thus,the PAPR can be reduced.The results of an experiment in Matlab show that,compared with the original method,the improved one possesses lower side information and stronger effect of PAPR control.