降低OFDM系统PAPR的改进SLM算法

摘要

In order to reduce the peak to average power ratio (PAPR) of the conventional selective mapping (SLM) algo-rithm, decrease the transmission of side-band information, and improve the spectral efficiency in the orthogonal frequen-cy division multiplexing (OFDM) system, the TL-SLM algorithm based on the conversion matrix and the chaotic se-quence was proposed firstly. Although the TL-SLM algorithm could effectively decrease the transmission of side-band information,the reduction of PA P R was limited.To solve this problem,an improved TL-SLM algorithm based on the ro-tation vector was proposed, which was the TR-SLM algorithm. TR-SLM algorithm introduced the rotation vector to gen-erate more time-domain alternative signals to further reducing the PA P R.The performance analysis shows that although the TL-SLM algorithm and the TR-SLM algorithm increase the complexity a little,the PA P R performance is effectively improved and the transmission of side-band information is greatly reduced.%为了降低正交频分复用系统中 SLM 算法的峰均功率比,减少边带信息传输,提高频谱利用率,首先提出基于转移矩阵和混沌序列的TL-SLM算法.TL-SLM算法有效减少了边带信息的传输,但PA P R的降低幅度有限.因此,进一步提出基于旋转向量的改进TL-SLM算法,即TR-SLM算法,该算法通过旋转向量的引入,产生更多的时域备选信号,达到进一步降低PA P R的目的.性能分析表明,虽然TL-SLM算法和TR-SLM算法少量增加了系统的复杂度,但PAPR性能得到了有效改善,而且较大幅度地减少了边带信息的传输.