【摘要】 为了减小正交频分复用(OFDM)系统的高峰值平均功率比(PAPR),采用了选择映射法(SLM)。SLM方法是一种有效的减小OFDM系统PAPR方法且不会产生信号失真。由于SLM方法需要设置循环前缀,可以通过离散小波变换(WT)改善OFDM系统,然后通过遗传算法(GA)搜索最佳相位旋转因子。仿真结果表明,该方法与传统的GA-SLM与SLM相比,能更有效地减小系统的PAPR。更多还原

【Abstract】 In order to reduce the high peak-to-average power ratio(PAPR)of the orthogonal frequency division multiplexing(OFDM)system,a selective mapping(SLM)method is adopted. The SLM method is an effective method to reduce the PAPR of the OFDM system,and can′ t produce the signal distortion. Since the SLM method needs to set the cyclic prefix,the discrete wavelet transform(WT) is used to improve the OFDM system,and the genetic algorithm(GA) is used to search the optimum phase rotation factor. The simulation results show that,in comparison with the traditional GA-SLM method and SLM method,the proposed method is more effective to reduce PAPR.更多还原