室内可见光通信信道估计的研究

发布时间：2018-01-10 02:18

本文关键词：室内可见光通信信道估计的研究　出处：《光电子技术》2014年04期 　论文类型：期刊论文

【摘要】：要:建立了室内可见光通信系统模型,针对其信道冲击响应,分别采用最小二乘(LS)估计方法和最小均方差(MMSE)估计方法对信道进行了理论分析,并且通过计算机仿真,对两种不同的估计方法性能进行了比较,最后在此基础上,分别对抽头长度和训练序列长度对信道估计的性能影响进行了仿真验证。实验结果表明:在相同信噪比下,MMSE方法的性能优于LS方法,但是计算量比LS方法复杂,而且LS方法性能依赖于噪声的影响,信噪比越高,LS估计方法的性能越好。同时抽头数越多,训练序列越长,信道估计的性能越好,但也会增加计算的复杂度。
[Abstract]:In this paper, a model of indoor visible light communication system is established. According to the channel impulse response, the least square estimation method and the minimum mean square error (MMSE) estimation method are used to analyze the channel. And through computer simulation, the performance of two different estimation methods are compared. Finally, on this basis. The effects of tap length and training sequence length on channel estimation performance are verified by simulation. The experimental results show that the performance of MMSE method is better than that of LS method under the same SNR. However, the computational complexity is more complex than LS method, and the performance of LS method depends on the influence of noise. The higher the SNR, the better the performance of LS estimation method. At the same time, the more taps, the longer the training sequence. The better the performance of channel estimation, the more computational complexity.
【作者单位】：四川大学电子信息学院光电系;
【基金】：中物院——四川大学协同创新联合基金项目(0020505419507)
【分类号】：TN929.1
【正文快照】： 1*引言相比于其它无线通信技术,可见光通信系统不仅可以提供室内的照明需求(主要为白光LED),而且又可以满足室内个人网络需求。同时由于室内可见光源为白光LED,白光LED具有低消耗功率,低电压,低寿命,更小的尺寸以及常温控制等优点[1-2],使得它日益引起了学术界和工程技术人员

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