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为抑制正交频分复用(OFDM)系统中较高的峰值平均功率比,通过分析系统的数学模型,利用傅里叶变换的线性原理,提出了一种改进的选择性映射算法,在保证选择性映射算法性能的同时对其计算量做了进一步优化,使算法具备了实际应用可实现的低复杂度特性.通过仿真可知,改进算法能使选择性映射算法的计算量下降50%以上,并且随着相位序列数目的增加,计算量会相应减少.
In order to suppress the high peak-to-average power ratio in Orthogonal Frequency Division Multiplexing (OFDM) system, an improved selective mapping algorithm is proposed by analyzing the mathematical model of the system and utilizing the linear principle of Fourier transform. The performance of the algorithm is selectively optimized and its computational complexity is further optimized so that the algorithm possesses the low complexity characteristics that can be achieved by the practical application.The simulation results show that the improved algorithm can reduce the computational cost of the selective mapping algorithm by more than 50% And as the number of phase sequences increases, the amount of computation will decrease accordingly.