一种降低IM/DD O-OFDM系统峰均比功率的低复杂度SLM方案  

A Low-Complexity SLM Scheme for Peak-to-Average Power Ratio Reduction in IM/DD O-OFDM Systems

作　　者：何聪聪 吴雅婷 韩梦欣 孙彦赞 张倩武 He Congcong;Wu Yating;Han Mengxin;SunYanzan;Zhang Qianwu(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai Institute for Advanced Communication and Data Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学上海先进通信与数据科学研究院特种光纤与光接入网重点实验室,上海200444

出　　处：《光学学报》2018年第8期292-297,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61601279;61420106011;61601277;61635006;61501289);上海市科委重点资助项目(17010500400;16511104100;16YF1403900)

摘　　要：抑制高峰均功率比(PAPR)是强度调制/直接检测(IM/DD)光正交频分复用(O-OFDM)系统面临的一个挑战,选择性映射(SLM)是有效降低PAPR值的经典算法。提出一种改进的SLM方案,该方案利用离散多音调制(DMT),通过一次快速逆傅里叶变换(IFFT)和循环移位相加运算获得多个候选信号,达到降低计算复杂度的目的。仿真和实验结果表明,所提出的SLM方案在保证获得较好的PAPR抑制性能的前提下,显著地降低了计算复杂度,同时提高了系统接收灵敏度。Peak-to-average power ratio（PAPR）reduction is a challenge for intensity modulation/direct detection（IM/DD）optical orthogonal frequency division multiplexing（OFDM）systems.Selective mapping（SLM）is a classical algorithm that can effectively reduce PAPR with high complexity.We propose an improved SLM scheme which employs discrete multitone modulation（DMT）to obtain several candidate signals through an inverse fast Fourier transform（IFFT）and cyclic shift addition operation,thereby reducing the computational complexity significantly.Both simulation results and experiments show that the proposed scheme achieves better PAPR reduction performance with low computational complexity and improves the receiver sensitivity.

关 键 词：光通信 强度调制/直接检测 光正交频分复用系统 选择性映射 峰均功率比 

分 类 号：TN929[电子电信—通信与信息系统]