Research on Visible Light Communication System Based on Three-Dimensional Orthogonal Frequency Division Multiplexing
To address the flaws of limited modulation bandwidth and frequency-selective fading,a visible light communication system,which is based on three-dimensional orthogonal frequency division multiplexing(3D-OFDM),has thus been proposed.On the basis of three-dimensional constellation mapping,the system helps to increase the minimum Euclidean distance(MED)between adjacent constellation points,thereby reducing the bit error rate of the system.A three-dimensional constellation mapping method,which is based on K-means clustering demodulation,is proposed for a solution of hard decision demodulation at the receiver being susceptible to nonlinear effects in visible light channels and sampling frequency offset interference.The results show that at a bit error rate of 3.8e-3,compared to 2D-OFDM systems modulated with 16QAM and 8QAM,the proposed 16ary and 8ary 3D-OFDM systems achieve signal-to-noise ratio(SNR)gains of 3 dB and 5 dB,respectively.Furthermore,the proposed 3D-OFDM system also exhibits an excellent performance in terms of peak-to-average power ratio(PAPR),with reductions of 0.3 dB and 0.4 dB,respectively.The proposed 3D-OFDM visible light communication(VLC)system is characterized with a better bit error performance.
visible light communication(VLC)orthogonal frequency division multiplexing(OFDM)three dimensional constellationK-means clustering
万方数据
维普
