VLC-LDPC系统校验矩阵的研究与实现  

Research and implementation of VLC-LDPC check matrix

作　　者：钟菲[1] 曹军胜[2] 陈云飞 佟浩 刘慧 ZHONG Fei;CAO Junsheng;CHEN Yunfei;TONG Hao;LIU Hui(Changchun Institute of Technology,School of Electronics and Information Engineering,Changchun 130021,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]长春工程学院电气与信息工程学院,长春130021 [2]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《激光杂志》2023年第8期139-144,共6页Laser Journal

基　　金：国家科技部重点发展计划项目(No.2021YFE0107600);吉林省教育厅科学研究资助项目(No.JJKH20191240KJ);吉林省科技发展计划资助项目(No.20200403052SF)。

摘　　要：可见光信道的噪声来源比较复杂,极大地影响信道中LDPC码的抗干扰性能,因此,根据可见光信道的典型特征,选择适合的LDPC编码是十分必要的。根据VLC-LDPC系统的特点,提出了一种选择构造LD-PC校验矩阵的方法,通过对校验矩阵的稳定性和稀疏度进行量化计算和对比,构造在可见光条件下,抗干扰性最强的LDPC编码,并搭建了基于FPGA的VLC-LDPC硬件测试系统。仿真和实测结果都表明,用设计的方法选取的校验矩阵构造的LDPC码在VLC通信系统中抗干扰能力更强,误码率可以达到10-6 dB,此外,还研究了码长、码率和迭代次数对VLC-LDPC系统的影响。本研究对于有效降低VLC-LDPC系统的误码率,提高通信效率,可以起到良好的辅助作用。The noise sources of the visible light channel is relatively complex,which greatly affect the anti-inter-ference performance of LDPC codes in the channel,therefore,it is necessary to select the suitable LDPC code accord-ing to the typical characteristics of the visible channel.According to the characteristics of VLC-LDPC system,a meth-od of selecting and constructing LDPC check matrix is proposed in this paper.By quantizing and comparing the stabili-ty and sparsity of the check matrix,LDPC coding with the strongest anti-interference performance under visible light conditions is constructed,and a LDPC-VLC hardware test system based on FPGA is built.Both simulation and actual measurement results show that the LDPC code constructed with the check matrix selected by the method designed in this paper has stronger anti-interference ability in the VLC communication system,and the BER(bit error rate)can reach 10-6 dB.In addition,the impact of code length,code rate and iteration times on the LDPC-VLC system is also studied in this paper.This research can effectively reduce the BER of the LDPC-VLC system and improve the commu-nication efficiency,which can play a good auxiliary role.

关 键 词：可见光通信 信道编码 校验矩阵 稀疏度 

分 类 号：TN911.22[电子电信—通信与信息系统]