降低PLC系统峰均比的低复杂度改进SLM算法

摘要

针对信道慢时变特性及噪声复杂的特点,提出了适用于低压电力线通信的降低峰均比的改进算法.改进算法对原始输入序列中的部分数据进行循环移位来获得一系列不同的新数据序列;在每个新数据序列尾部插入相应的边带信息组成一个输入候选序列;对这一系列不同的输入候选序列分别实施傅里叶反变换,得到不同的输出序列;从中选择峰均比最小的用于传输,达到降低系统峰均比的目的.结果表明：改进算法能够有效地降低系统的峰均比,并且能够获得更好的误码率性能,同时具有比传统选择性映射方法更低的计算复杂度.%A reduce peak-to-average power ratio（PAPR） algorithm was proposed aim at the slow-variant and complex noise of channel.The partial data within the original data sequence were scrambled by circularly shifting to obtain a set of new data sequences.Each new data sequence tail was inserted the corresponding side information（SI） to form the input candidate sequence.Inverse fast Fourier transform（IFFT） was operated by different input candidate sequence separately to obtain different output sequence.Chosen of the lowest PAPR,the PAPR of system could be greatly reduced.The simulation results indicate that the improved algorithm can reduce PAPR effectively and get a better bit error rate and the algorithm has lower computational complexity than selected mapping（SLM）.