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针对当前可见光通信系统自适应信道估计法缺点,建立了一种可见光通信系统自适应信道估计方法。首先充分考虑信道频率响应特性,采用正交频分复用方法把自适应信道切割为多段并行子道,调制信号以低时速在各子道中传输,然后当自适应信道中无传输任务时,使用锯齿型导频信号抑制频域响应波动,当自适应信道进行信号传输时,最后采用MMSE检测法进行自适应信道估计。实验结果证明,本文方法信道估计误差小,误码率低,整体性能高。
Aiming at the shortcomings of the current adaptive channel estimation method for visible light communication system, an adaptive channel estimation method for visible light communication system is established. First of all, fully consider the frequency response characteristics of the channel, the use of orthogonal frequency division multiplexing method to cut adaptive channel multisection parallel sub-channel, the modulation signal at low speed transmission in each sub-channel, and then when no adaptive channel transmission tasks, the use of Zigzag pilot signal to suppress the frequency response fluctuations, when the adaptive channel signal transmission, the last MMSE detection adaptive channel estimation. Experimental results show that the proposed method has the advantages of small channel estimation error, low bit error rate and high overall performance.