基于压缩感知的MIMO-DCO-OFDM VLC信道估计研究  

Compressed Sensing-based Channel Estimation for MIMO-DCO-OFDM VLC

作　　者：李致锋 汤璇 魏宪 王祯旺 LI Zhi-feng;TANG Xuan;WEI Xian;WANG Zhen-wang(Quanzhou Institute of Equipment Manufacturing,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Quanzhou 362000,Fujian Province,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China)

机构地区：[1]中国科学院福建物质结构研究所,泉州装备制造研究中心,福建泉州362000 [2]福建省光电信息科技创新实验室,福州350108

出　　处：《信息技术》2023年第11期73-81,86,共10页Information Technology

基　　金：福建省中科院STS计划配套项目资助(2020T3026);泉州市科技计划产学研项目资助(2020C069);泉州科技计划高新工业项目资助(2020G18);中国福建光电信息科学与技术创新实验室主任基金项目资助(2021ZR136)。

摘　　要：为了改善可见光通信(VLC)带宽受限的问题,利用多输入多输出直流偏置光正交频分复用技术(MIMO-DCO-OFDM)优化VLC系统以提高传输速率,构建了一个室内4×4 MIMO-DCO-OFDM VLC系统。同时提出了一种改进的分段弱正交匹配追踪(ISWOMP)算法用于VLC系统的信道估计以降低导频开销。仿真结果表明,在4×4 MIMO-DCO-OFDM VLC系统中,与传统最小二乘法相比,该算法具有较低的导频开销和更好的估计精度。在不同信噪比的情况下,ISWOMP算法均比传统CS正交匹配追踪算法(OMP)具有更高的估计精度,同时该方法无需提前获取信号稀疏度,比OMP更具有现实应用的可能性。In order to improve the problem of limited bandwidth of Visible Light Communication(VLC),the VLC system is optimized by using Multi-Input-Multi-Output Direct Current Optical Orthogonal Frequency Division Multiplexing(MIMO-DCO-OFDM)to increase the transmission rate,and construct an indoor 4×4 MIMO-DCO-OFDM VLC system.At the same time,an Improved Stagewise Weak Orthogonal Matching Pursuit(ISWOMP)algorithm is proposed for the channel estimation of the VLC system to reduce the pilot overhead.The simulation results show that in the 4×4 MIMO-DCO-OFDM VLC system,compared with the traditional least square method,the algorithm has lower pilot overhead and better estimation accuracy.In the case of different signal-to-noise ratios,Compared with the traditional CS orthogonal matching pursuit algorithm(OMP),the ISWOMP algorithm has higher estimation accuracy.At the same time,this method does not need to obtain the signal sparsity in advance,and has more practical application possibilities than OMP.

关 键 词：压缩感知 多输入多输出 直流偏置光正交频分复用 信道估计 可见光通信系统 

分 类 号：TN256[电子电信—物理电子学]