时变信道下光通信编码方案设计与分析研究  

Design and analysis of optical communication coding scheme in time varying channels

作　　者：胡珺珺 霍佳璐 王宝珠 HU Junjun;HUO Jialu;WANG Baozhu(College of Communication and Information Engineering,Chongqing College of Mobile Communication,Chongqing 401520,China;Chongqing Key Laboratory of Public Big Data Security Technology,Chongqing 401520,China)

机构地区：[1]重庆移通学院通信与信息工程学院,重庆401520 [2]公共大数据安全技术重庆市重点实验室,重庆401520

出　　处：《激光杂志》2025年第3期187-192,共6页Laser Journal

基　　金：重庆市教育委员会科学技术研究青年项目(No.KJQN202202401);重庆市自然科学基金项目(No.CSTB2022NSCQ—MSX1125)。

摘　　要：为推动光通信技术在复杂多变的信道环境中降低码间干扰和信道失真,实现更加高效、稳定的数据传输,设计时变信道下光通信编码方案。构建考虑多径效应、非线性失真、信号衰减及噪声等因素的时变光通信信道模型,并引入直接序列扩频(DSSS)技术和参数化时反矩阵(PTRM)技术减轻码间干扰和信道失真;在光通信的发送端,利用低密度奇偶校验(LDPC)编码技术设计了光通信编码方案,通过构建稀疏校验矩阵,并利用行列置换算法(RU算法)将校验矩阵转换为近似下三角形式,生成LDPC编码码字向量;在接收端采用软判决译码方法,通过精细的多电平量化处理和迭代算法,逐步逼近并确定发送码字。实验结果表明:在不同温度波动和信噪比条件下,该编码方案均能够显著降低误码率。Design optical communication coding schemes under time-varying channels to promote optical communication technology in reducing inter symbol interference and channel distortion in complex and changing channel environments,achieving more efficient and stable data transmission.Construct a time-varying optical communication channel model that considers factors such as multipath effects,nonlinear distortion,signal attenuation,and noise,and introduce direct sequence spread spectrum(DSSS) technology and parameterized inverse time matrix(PTRM) technology to mitigate inter symbol interference and channel distortion;At the transmitting end of optical communication,an optical communication encoding scheme was designed using low-density parity check(LDPC) encoding technology.By constructing a sparse parity check matrix and using the row column permutation algorithm(RU algorithm) to convert the parity check matrix into an approximate lower triangular form,an LDPC encoded codeword vector was generated;At the receiving end,a soft decision decoding method is used to gradually approximate and determine the transmission codeword through fine multi-level quantization processing and iterative algorithms.The experimental results show that under different temperature fluctuations and signal-to-noise ratio conditions,this encoding scheme can significantly reduce the bit error rate.

关 键 词：时变信道 OFDM 时频分解技术 LDPC编码 RU算法 软判决译码 

分 类 号：TN929.12[电子电信—通信与信息系统]