研究了基于正交频分复用（OFDM）调制的可见光通信（VLC）系统的导频设计方法。针对室内可见光通信信道特性, 研究了导频数目对于信道容量的影响, 从理论上给出了导频间隔与信道容量下界的关系式。在此基础上, 建立了基于OFDM调制的可见光通信实验系统, 并以上述理论关系式作为导频数目的设计依据。实验结果表明, 随着导频间隔的变化, 实验系统得到的系统频谱效率与理论给出的信道容量下界的变化趋势吻合, 即文章提出的导频间隔与信道容量下界的理论关系式为可见光通信的最优导频间隔设计提供了理论依据。

Studied is the method of pilot design of visible light communication system based on orthogonal frequency division multiplexing(OFDM). For the channel characteristics of indoor visible light communication, it studies the influence of pilot number on channel capacity and gives the relation between pilot interval and lower bound of channel capacity theoretically, on this basis, an experimental system of visible light communication was established based on OFDM and a pilot number was designed according to the above theoretical relation. The experimental results show that with the change of the pilot interval, the variation trends of system spectral efficiency obtained from experiment and lower bound of channel capacity are similar. The proposed theoretical relation between pilot interval and lower bound of channel capacity provides an optimal pilot interval of visible light communication with theoretical basis.