摘要
针对可见光通信(VLC)中混合非对称幅度截断光正交频分复用(HACO-OFDM)系统中非视距路径(NLOS)信道会恶化可见光通信系统的误码性能,提出一种用于HACO-OFDM系统的信道估计方案。在该方案中,块状导频仅被添加到奇数子载波,通过联合最小二乘(LS)算法和三次样条插值获得完整的信道状态信息(CSI)。仿真结果表明,HACO-OFDM系统采用提出的信道估计方案后,显著改善了来自NLOS信道信号的误码性能。本方案实现简单,能够较准确的获取信道状态信息,可以提高NLOS场景下的可见光通信质量。
Due to the truth that the bit error performance of visible light communication(VLC) systems will be deteriorated by the Non-line-of-sight path channels(NLOS), therefore, a channel estimation scheme is proposed for Hybrid Asymmetrically Clipped Optical Orthogonal Frequency Division multiplexing(HACO-OFDM) system. Moreover, the block pilots are only added to odd-numbered subcarriers. Thus, the complete channel state information(CSI) be obtained by combing the cubic spline interpolation with the least squares(LS) algorithm. The simulation results show that this proposed scheme can significantly improve the bit error performance of the received signals from the NLOS channel in the HACO-OFDM system. In a word, this scheme is simple to implement and the channel state information can be obtained accurately, which can improve the quality of visible light communication in NLOS scenarios.
作者
王涛
陈善继
陈超
WANG Tao;CHEN Shanji;CHEN Chao(National Demonstration Center for Experimental Communication Engineering Education,Qinghai Minzu University,Xining 810007,China;Key Laboratory of Communication Engineering,Qinghai Minzu University,Xining 810007,China)
出处
《激光杂志》
CAS
北大核心
2023年第2期135-142,共8页
Laser Journal
基金
青海省应用基础研究项目(No.2021-ZJ-704)
青海民族大学2021年度校级高层次人才(博士)项目(No.2021XJG12)。
关键词
可见光通信
混合非对称幅度截断光正交频分复用
非视距路径
信道估计
最小二乘算法
visible light communication
hybrid asymmetrically clipped optical orthogonal frequency division multiplexing
non-line of sight
channel estimation
least square algorithm
