OFDM-PON系统中一种抑制峰均功率比的安全算法  

Secure Algorithm for Suppressing Peak-to-Average Power Ratio in OFDM-PON Systems

作　　者：韩梦欣 吴雅婷[1] 张倩武[1] 孙彦赞[1] Han Mengxin;Wu Yating;Zhang Qianwu;Sun Yanzan(Shanghai Institute for Advanced Communication and Data Science, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China)

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

出　　处：《光学学报》2019年第5期78-85,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61601279,61601277,61501289);国家自然科学基金国际合作重点项目(61420106011);上海市科委重点项目(17010500400,18511103400,16511104100,16YF1403900)

摘　　要：安全性低和较高的峰均功率比(PAPR)是正交频分复用无源光网络(OFDM-PON)系统所面临的主要挑战,为此提出一种基于二维混沌加密的选择性映射(SLM)方案。该方案利用二维Logistic映射分别产生随机交织器和相位序列对OFDM信号进行加扰,达到系统加密的同时降低PAPR的目的。仿真结果显示,与传统SLM算法和原始光OFDM(O-OFDM)信号相比,所提出的方案可分别获得0.5dB和3.8dB的PAPR抑制增益。实验证明,7Gbit/s 16QAM (Quadrature Amplitude Modulation)O-OFDM加密信号可通过25km标准单模光纤在强度调制/直接检测OFDM-PON系统中安全传输并且系统误码率性能得到改善。Low security and high peak-to-average power ratio (PAPR) are two major challenges for orthogonal frequency division multiplexing passive optical network (OFDM-PON) systems. This study proposes a secure selective mapping (SLM) scheme based on two-dimensional chaotic encryption. The subcarriers of OFDM signals are scrambled by the random interleavers and phase sequences generated using a two-dimensional logistic map to achieve both encryption and PAPR reduction. The simulation results show that compared with the conventional SLM and original optical OFDM (O-OFDM) signals, the proposed scheme can obtain PAPR suppression gains of 0.5 dB and 3.8 dB, respectively. The experimental results demonstrate that a 7 Gbit/s 16-quadrature-amplitude-modulation (16QAM) O-OFDM encrypted signal can be securely transmitted in the intensity modulation/direct detection OFDM-PON system through a 25-km standard single-mode fiber. Moreover, the bit error rate performance of OFDM-PON systems is considerably improved.

关 键 词：光通信 强度调制/直接检测正交频分复用无源光网络系统 选择性映射 加密 峰均功率比 

分 类 号：TN929.IL[电子电信—通信与信息系统]