中文摘要：

针对光正交频分复用（O-OFDM）系统中峰值平均功率比（PAPR）较高的缺点,对PAPR抑制技术的选择性映射法（SLM）进行了深入研究。基于低复杂度SLM方案的深入研究,提出了一种改进的次PAPR选择的思想与低复杂度SLM相结合的PAPR抑制方案。改进的SLM方案能够成倍降低传统SLM方案的计算复杂度。仿真分析表明,改进的SLM方案在载波数为256的OOFDM系统中,计算复杂度能降低50%以上,并且随着子载波数的增加,其复杂度降低程度更为高效;同时,该改进的SLM方案又能使其PAPR抑制性能优于传统的SLM方案,从而进一步提升了低复杂度SLM方案的实用价值。

英文摘要：

According to the defect of the high peak-to-average-power-ratio （PAPR） in optical orthogonal frequency division multiplexing （O-OFDM） systems, the selected mapping （SLM） method for PAPR reduction technologies has been deeply studied. An improved PAPR reduction technology, which combines the idea of the second PAPR selection and the low-complexity SLM scheme, is proposed. The improved SLM scheme,eo;pared with the conventional SLM scheme, can significantly reduce the computational complexity. The simulation analysis shows that the improved SLM scheme can reduce the computational complexity more than 50; for the optical OFDM systems with 256 subcarriers. And with the increase of the number of subcarriers, the computational complexity can be effectively reduced. At the same time, the PAPR reduction performance of the improved SLM scheme is superior to that of the conventional SLM scheme. As a result, the improved SLM scheme can further promote the practical value of the low-complexity SLM scheme.