In order to analyze the transmission and reception characteristics of visible light signals in single-path and multi-path Rayleigh channels,we design an indoor visible ligh t communication system based on white LED,in which three kinds of QAM-OFDM signals are used under Ray leigh channel condition.Firstly,the simulation model of visible light communication system s upporting three types of QAM-OFDM signals is built by using MATLAB software.And then,the relationship between the bit error rate (BER) and the received signal-to-noise ratio (SNR) of three types of QAM-OFDM signals in single- path and two-path Rayleigh fading channels are analyzed.It is suggested that 8QAM-OFDM signals should be selected in the transceiver in practical application,if the bandwidth utiliz ation and digital signal processing are considered.At last,the feasibility of 8QAM-OFDM signal is veri fied by illumination analysis.