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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。
To establish a model of indoor visible light communication system, for the channel impulse response, the channel is analyzed by least squares (LS) estimation and MMSE (minimum mean square error) methods respectively. And by computer simulation, The performance of different estimation methods are compared. Finally, on the basis of this, the influence of the length of the tap and the length of the training sequence on the performance of the channel estimation is simulated. The experimental results show that the performance of MMSE method is better than that of LS method under the same signal-to-noise ratio, but the computational complexity is more complex than that of LS method. Moreover, the performance of LS method depends on the influence of noise. it is good. The more taps at the same time, the longer the training sequence, the better the performance of channel estimation, but also increase the computational complexity.