湍流信道下非对称限幅光OFDM自适应索引调制方案  

Asymmetric clipped optical OFDM adaptive indexing modulation scheme under turbulent channels

作　　者：王惠琴[1] 裴岩浩 王真 唐崎涵 茹辉 张红彦 WANG Huiqin;PEI Yanhao;WANG Zhen;TANG Qihan;RU Hui;ZHANG Hongyan(School of Computer and Communication,Lanzhou University of Science and Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050

出　　处：《通信学报》2024年第11期174-183,共10页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62261033,No.62265010);甘肃省重点研发计划基金资助项目(No.22JR5RA278)。

摘　　要：针对现有光正交频分复用(OFDM)索引调制技术难以适应信道变化,导致系统传输速率受限的问题,构建了一个以最大化传输速率为目标的阈值优化模型。通过动态地寻找最佳M-QAM调制切换阈值,提出一种光OFDM自适应索引调制方案。在详细介绍信号的映射原理后,推导出所提方案在不同湍流强度下的最佳阈值和理论误码率。仿真结果表明,与传统光OFDM索引调制方案相比,所提方案在满足目标误码率的前提下,显著提升了系统的传输速率。Given the issue that existing optical orthogonal frequency division multiplexing(OFDM)with index modula‐tion(OOFDM-IM)struggle to adapt to channel variations,which results in limitations on transmission rate.A threshold optimization model aimed at maximizing transmission rate was constructed.By dynamically identifying the optimal M-QAM modulation switching threshold,an optical OFDM adaptive indexing modulation scheme was proposed.After a de‐tailed introduction to the mapping principle of the signal,the optimal threshold and theoretical bit error rate under differ‐ent turbulence intensities were derived.The simulation results show that compared with traditional OOFDM-IM schemes,the proposed scheme significantly enhances transmission rate while satisfying the target bit error rate.

关 键 词：索引调制 自适应调制 最佳阈值 传输速率 

分 类 号：TN929.12[电子电信—通信与信息系统]