基于MSLM的OFDM系统PAPR减小方法

PAPR Reduction Method Based on MSLM for OFDM System

针对选择性映射-正交频分复用(SLM-OFDM)系统运算量过大的问题,提出了一种基于多选择性映射(MSLM)的OFDM系统的峰值平均功率比(PAPR)减小方法.该方法在OFDM系统的发送端,对发送数据进行等分分组扰码.分组扰码后,可以使得PAPR降低,同时也减少了计算量.仿真结果表明,在没有较大的误码率损失的前提下,当选择支路数为16,互补累积分布函数FCCD为10-3时,MSLM方法的PAPR优于传统的SLM(CSLM)方法1.3dB.

To deal with the issue of large computational complexity in SLM-OFDM system,a PAPR reduction method using multiple select mapping （MSLM） is present for OFDM system. This method divides the transmit data into multiple groups. Each group has the same data length at transmit end of OFDM system. Other performance of the method is similar to the SLM. Thus,PAPR is reduced by using MSLM method for OFDM signal,and the computational complexity is decreased as well. Simulation results demonstrate that MSLM method outperforms the conventional SLM（CSLM） algorithm with respect to PAPR by 1.3dB when selection branch number is 16 and CCDF is 10-3. It also has better symbol error ratio performance.