基于正交映射的OFDM峰均比控制快速算法

为了克服正交频分复用(Orthogonal frequency division multiplexing，OFDM)信号的高峰均比问题，拳文研究了基于单正交映射的部分传输序列(Partial transmit sequences，PTS)算法及其在信号过采样形式中的应用，发现信号过采样会造成单正交映射的相位优化复杂度呈二次增长。借助于Monte—Carlo仿真，证明了在单正交映射过程中会产生大量的冗余。通过改变正交映射方式和删除冗余，提出了一种新的PTS快速相位优化算法。分析和实验结果表明，该算法能较大程度地减小运算复杂度，且可以获得好的峰均比改善性能。

Low Complexity PAPR Reduction in OFDM Based on Orthogonal Projection

The scheme of orthogonal projection-based (O P) partial transmit sequences (PTS) is used to solve the problem of high peak-t o-average power ratio (PAPR), i.e., one of the major drawbacks of orthogonal fr equency division multiplexing (OFDM). Since the PAPR of the PTS signal is sample d at Nyquist rate regrows dramatically, oversampling is needed. However, the com plexity of OP-PTS is increased quadratically when OFDM signal is oversampled. I t is proved that abundant redundancies exist in phase optimization by Monte-Car lo method. By eliminating redundancies and modifying orthogonal projection proce ss, a new scheme with low complexity is proposed. Analysis and simulation result s show that the method can reduce the computation complexity, thus obtaining the good performance of PAPR reduction.