基于GA-PTS的无厄米特对称光OFDM系统峰均比抑制算法的研究  

Peak-to-Average Ratio Suppression Algorithm for Non-Hermitian Symmetric Optical OFDM System Based on GA-PTS

作　　者：秦岭 于利强 王凤英[1] 胡晓莉[1] 杜永兴[1] Qin Ling;Yu Liqiang;Wang Fengying;Hu Xiaoli;Du Yongxing(School of Information Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学信息工程学院,内蒙古包头014010

出　　处：《激光与光电子学进展》2023年第7期92-99,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62161041);内蒙古关键技术攻关项目(2021GG0104);内蒙古自然科学基金(2019LH06005)。

摘　　要：光正交频分复用(O-OFDM)技术被广泛应用于可见光通信系统(VLC)中以提高数据传输速率,但是O-OFDM系统存在峰值平均功率比(PAPR)高的问题,限制了其系统性能。本文首先针对传统的非对称限幅光正交频分复用(ACOOFDM)系统频谱效率低下以及计算复杂度高的问题,使用无厄米特对称的单极性光正交频分复用(UO-OFDM)系统。其次在UO-OFDM系统上使用传统的部分传输序列(PTS)技术来降低其PAPR,同时针对传统的PTS技术计算复杂度高以及搜索最佳相位旋转因子效率低的问题,提出使用遗传算法(GA)来优化PTS技术。仿真结果表明:GA-PTS相比于传统的PTS技术,在PAPR抑制性能差别不大的情况下极大地减少了搜索最佳相位旋转因子所需的时间;同时与基于GA-PTS算法的ACO-OFDM系统所用的时间相比,基于GA-PTS算法的UO-OFDM系统所用的时间有所减少,且随着最大遗传代数的增加,减少的时间更加明显。Optical orthogonal frequency division multiplexing(O-OFDM)technology is widely used in visible light communication(VLC)to improve the data transmission rate.However,O-OFDM systems have high peak-to-average power ratios(PAPRs),which limit their system performance.First,this study uses unipolar optical orthogonal frequency division multiplexing(UO-OFDM)without Hermitian symmetry to solve the problems of low spectral efficiency and high computational complexity of the conventional asymmetrically clipped optical orthogonal frequency division multiplexing(ACO-OFDM)system.Second,the conventional partial transmission sequence(PTS)technique is applied to the UOOFDM system to decrease its PAPR,and a genetic algorithm(GA)is used to optimize the PTS technique for solving high computational complexity and low efficiency in searching for the optimal phase rotation factor of the conventional PTS technique.The simulation results show that GA-PTS significantly reduces the time required to search for the optimal phase rotation factor compared to the conventional PTS technique,with a slight difference in the PAPR suppression performance.Compared to the time used by the ACO-OFDM system based on the GA-PTS algorithm,the time used by the UO-OFDM system based on the GA-PTS algorithm is reduced.With an increase in the maximum generation,the reduced time becomes more significant.

关 键 词：光通信 可见光通信 正交频分复用 峰值平均功率比 部分传输序列 遗传算法 

分 类 号：TN929.1[电子电信—通信与信息系统]