水下无线光通信动态阈值判决技术研究与性能分析  

Research and performance analysis of dynamic threshold decision technology in underwater wireless optical communication

作　　者：王争辉 高冠军 张家梁 李哲 WANG Zhenghui;GAO Guanjun;ZHANG Jialiang;LI Zhe(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;The 34th Research Institute of CETC,Guilin Guangxi 541004,China)

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]中国电子科技集团公司第三十四研究所,广西桂林541004

出　　处：《光通信技术》2024年第2期7-11,共5页Optical Communication Technology

基　　金：国家自然科学基金项目(62371064)资助;北京市自然科学基金项目(4232050)资助;北京邮电大学博士创新项目(CX2022213)资助。

摘　　要：针对海洋湍流信道环境下固定阈值判决方案导致水下无线光通信系统性能恶化的问题,提出了一种动态阈值判决方案。该方案基于水下湍流信道慢衰落的特性,在发送端将数据以帧为单位进行发送,接收端则根据接收帧前导码的幅度每帧更新一次判决阈值。采用蒙特卡洛法和Gamma-Gamma信道模型对水下无线光通信系统进行仿真,仿真结果表明:在弱湍流信道环境下,当系统误码率为10^(-6)时,动态阈值判决方案比固定阈值判决方案的误码性能提升5.4 dB;在中、强湍流信道环境下,动态阈值判决方案能够有效抑制误码率门限现象的产生。Aiming at the problem that the fixed threshold decision scheme 1eads to the deterioration of the performance of the un-derwater wireless optical commmnication system in the turbulent channel environment,a dynamic threshold decision scheme is proposed.Based on the slow fading characteristic of the underwater turbulent channel,the data is sent by fame at the sending end,and the decision threshold is updated every frame at the receiving end according to the amplitude of the leading code of the receiving fame.This paper uses the Monte Carlo method and the Gamma-Gamma turbulence channel model to simulate the un-derwater wireless optical comnuinication system The simulation results show that in the case of weak turbulence channel envi-ronment and when the system bit error rate is 10^(-6) the dynamic threshold decision scheme improves the bit error performance by 54 dB compared with the fixed threshold decision scheme.In the case of medium and strong turbulence channel environment,the dynamic threshold decision scheme can effectively suppress the occurrence of bit error rate threshold phenomenon.

关 键 词：水下无线光通信 动态阈值判决 海洋湍流 Gamma-Gamma信道模型 

分 类 号：TN929[电子电信—通信与信息系统]