误码检测机制的室内无线光通信系统研究  

Study on indoor wireless optical communication system with error detection mechanism

作　　者：阴欢欢 周建国[2] YIN Huanhuan;ZHOU Jianguo(School of Bei Dou,Wuhan Qingchuan University,Wuhan 430000,China;Electronic Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉晴川学院北斗学院,武汉430000 [2]武汉大学电子信息学院,武汉430072

出　　处：《激光杂志》2021年第8期135-139,共5页Laser Journal

基　　金：湖北省教育厅科学研究计划项目(No.B2018396)。

摘　　要：衡量无线光通信系统最重要的指标就是误码率,因此,提出了基于误码检测机制的室内无线光通信系统。在Matlab仿真软件内使用时域离散信号表示室内无线光通信系统的时域连续信号,把时域离散信号存储到一组矩阵或者向量中获得信源信号,考虑信源信号在信道传输过程中存在的加性高斯白噪声得出噪声平均功率,依据该功率使用湍流信道上对数正态分布模型推导出对数正态分布下室内无线光通信系统误码率公式,构建激光发射器光功率、湍流强度、光源相干参数与通信系统误码率之间的定量关系。经分析证明:不同通信波长下,激光发射器光功率-30 d Bm时,湍流强度变化与不同光源相干参数变化都会对误码率造成显著影响;室内环境较明亮情况下信噪比越高通信系统的误码率越低,而阴暗环境将使通信系统的误码率升高。Bit error rate is the most important index to measure wireless optical communication system,so the error detection mechanism of indoor wireless optical communication system is studied.Within the Matlab simulation software using time domain discrete time domain signal said indoor fso system of continuous signal,or stored in the discrete time domain signal into a set of matrix vector of source signals,consider the source signals in the transmission channel is ad-ditive gaussian white noise in the process of it is concluded that the average noise power,on the basis of lognormal dis-tribution on the power using turbulent channel model is derived under the lognormal distribution indoor fso system ber formula,build the laser light power,turbulence intensity,light source coherence parameters and the quantitative rela-tionship between the communications system ber.The results show that the variation of turbulence intensity and coher-ent parameters of different light sources have significant influence on bit error rate when the optical power of laser emit-ter is-30 dBm at different communication wavelengths.The bit error rate of the communication system will be lower if the room environment is bright and the SNR is higher,while the bit error rate of the communication system will be higher if the environment is dark.

关 键 词：误码率 检测机制 室内 无线光通信 湍流信道 空气折射率 

分 类 号：TN929[电子电信—通信与信息系统]