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。 The pilot design method of visible light communication (VLC) system based on Orthogonal Frequency Division Multiplexing (OFDM) modulation is studied. In view of the characteristics of indoor visible light communication channel, the influence of the number of pilots on the channel capacity is studied. The relationship between the pilot spacing and the lower bound of channel capacity is theoretically given. On this basis, we establish a visible light communication experiment system based on OFDM modulation, and use the above theoretical relationship as the design basis of the pilot number. The experimental results show that with the change of pilot spacing, the system spectral efficiency obtained by the experimental system is consistent with the trend of the lower bound of the channel capacity given by the theory. That is, the theoretical relationship between the pilot spacing and the lower bound of the channel capacity proposed in the paper is visible light communication The optimal pilot interval design provides a theoretical basis.