摘要
针对传统信道估计算法导频开销大而直流偏置光正交频分复用(DCO-OFDM)系统频带利用率低的问题,提出了基于压缩感知深度优先多路径匹配追踪(MMP-DF)的水下光信道估计方法。该方法利用DCO-OFDM系统的导频处频域响应构建压缩感知模型,将MMP-DF算法用于水下光信道估计中,进而估计出信道时域脉冲响应。仿真结果表明:在DCO-OFDM系统中,与传统信道估计算法相比,该方法所需导频开销小但估计精度高;导频数量较少时,估计精度优于正交匹配追踪(OMP)算法。
Aiming at the problems of high pilot overhead of traditional channel estimation algorithm and low frequency utilization of the underwater direct current optical orthogonal frequency division multiplexing(DCO-OFDM)system,an underwater optical channel estimation method based on compressed sensing depth-first multi-path matching pursuit(MMP-DF)is proposed.Based on the frequency domain response at the pilot frequency of DCO-OFDM system,this method constructs a compressed sensing model applies the MMP-DF algorithm to underwater optical channel estimation,and then estimates the channel time-domain impulse response.Simulation results show that in the DCO-OFDM system,compared with the traditional channel estimation algorithm,this method requires less pilot overhead and high estimation accuracy.When the number of pilots is small,the estimation accuracy of MMP-DF algorithm is better than orthogonal matching pursuit(OMP)algorithm.
作者
胡云云
李晓记
李燕龙
阎威龙
杜卫海
高天
HU Yunyun;LI Xiaoji;LI Yanlong;YAN Weilong;DU Weihai;GAO Tian(College of Information and Communication,Guilin University of Electronic Technology,Guilin Guangxi 541004,China;Ministry of Education Key Lab of Cognitive Radio and Information Processing,Guilin Guangxi 541004,China)
出处
《光通信技术》
北大核心
2020年第7期28-31,共4页
Optical Communication Technology
基金
国家自然科学基金(61761014)资助
广西自然科学基金(2018GXNSFBA281131)资助
广西重点研发计划资助项目(桂科AB18126030)资助
广西信息科学实验中心项目(编号:PT1604)资助。
关键词
水下可见光通信
直流偏置光正交频分复用
信道估计
多路径匹配追踪
压缩感知
underwater visible light communication
direct current optical orthogonal frequency division multiplexing
channel estimation
multi-path matching pursuit
compressed sensing
