摘要
可见光通信系统的空间相关性会对系统信道容量以及系统性能产生巨大的影响,为此对回声状态网络下的可见光通信系统空间相关性进行研究。基于回声状态网络设计通信信道模型,分别计算直射链路以及非直射链路的信道直流增益效果,在通信函数的基础上建立可见光通信模型,并设置回声状态网络连接矩阵;分析可见光通信系统空间相关性,获取接收机热噪声的系数比;在发射与接收端口建立矩阵结构,依据接收角的集中增益系数,更新信号接收集中增益比;计算空间相关容量误差,以此获取相关系数。实验结果显示,2*2信道容量下,三种频率的空间相关性分别在链路距离为80 m、100 m和150 m时归零,2*4信道容量的最大链路距离则为140 m、190 m、230 m,信道容量和中心点频率均对空间相关性具有正向影响。
The spatial correlation of visible light communication system will have a great impact on the system channel capacity and system performance.Therefore,this paper studies the spatial correlation of visible light communication system under the echo state network.Based on the echo state network,the communication channel model is designed,the channel DC gain effect of the direct link and indirect link respectively is calculated,the visible light communication model based on the communication function,and set the echo state network connection matrix is set.The spatial correlation of visible light communication system is analyzed to obtain the coefficient ratio of thermal noise of receiver.The matrix structure is established at the transmitting and receiving ports,and the signal receiving lumped gain ratio is updated according to the lumped gain coefficient of the receiving angle;the spatial correlation capacity error is calculated to obtain the correlation coefficient.The experimental results show that under the 2∗2 channel capacity,the spatial correlation of the three frequencies returns to zero when the link distance is 80 m,100 m and 150 m respectively,and the maximum link distance of the 2∗4 channel capacity is 140 m,190 m and 230 m.The channel capacity and center point frequency have a positive impact on the spatial correlation.
作者
刘芳
陈志标
LIU Fang;CHEN Zhibiao(Concord College of Fujian Normal University,Fuzhou 350117,China)
出处
《激光杂志》
CAS
北大核心
2023年第6期182-186,共5页
Laser Journal
基金
福建省中青年教师教育科研科技项目(No.JAT200959)。
关键词
回声状态网络
可见光通信系统
空间相关性
通信链路距离
信道容量
echo state network
visible light communication system
spatial correlation
communication link distance
channel capacity
