改进SLM算法降低OFDM系统峰均比的研究

针对选择性映射算法(SLM)在降低正交频分复用系统峰均比时,计算复杂度过高的问题,对一种改进的SLM算法进行研究,然后在此基础上对其进行扩展,并将其应用于更多的分组序列。扩展后的算法在对信号进行过采样之后,通过用变换矩阵取代部分IFFT运算的方法来降低SLM算法计算的复杂度。复杂性分析和计算机仿真结果表明,改进SLM算法能在保持系统性能几乎不变的情况下有效降低计算的复杂度。

Research on the Improved SLM Algorithm for PAPR Reduction in OFDM System

The SLM algorithm has high computational complexity for reducing the PAPR of the OFDM system.Based on researching an improved SLM scheme,this paper apply it to the more grouping sequence by extending the number of the random phase series.After oversampling the signal,the improved scheme introduce a low-complexity conversions to replace the IFFT blocks in the conventional SLM method.Computer simulation results and complexity analysis show that the extendable improved SLM approach can reduce availably the computational complexity and reach almost the same performance for PAPR reduction.