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针对OFDM系统中对信号直接限幅造成的非线性失真和信道估计性能下降,提出1种级联限幅及基于压缩感知的非线性失真恢复算法.该算法通过发送端的2次限幅操作,降低了导频处的非线性失真.在接收端利用压缩感知技术对非线性噪声进行估计并补偿.仿真表明,该算法能够有效消除非线性噪声对信道估计影响,提高信道估计性能,与迭代消除非线性失真算法相比,具有更好的峰均比抑制能力.
Aiming at the nonlinear distortion caused by the direct clipping of the signal and the degradation of the channel estimation performance in OFDM system, a kind of cascaded clipping and nonlinear distortion recovery algorithm based on compressive sensing is proposed. The algorithm reduces the amplitude The non-linear distortion at the pilot is measured, and the non-linear noise is estimated and compensated by compressive sensing at the receiving end.The simulation shows that this algorithm can effectively eliminate the influence of nonlinear noise on channel estimation and improve the channel estimation performance, Compared with the linear distortion algorithm, the peak-to-average rejection ratio is better.