Carrier allocation combined with independent component analysis for multiple-input-multiple-output visible light communication

We present a scheme based on precoding carrier allocation and independent component analysis (ICA) for indoor multiple-input-multiple-output (MIMO) visible light communication (VLC). In order to improve the reliability of the ICA algorithm for the mixed signal separation, at the sending end, frequency doubled-carriers are employed to module the parallel data which ensure that the modulated signals are independent of each other. The ICA algorithm is applied to separate the mixed signal at the receiving end directly without the requirement of the channel information. Simulation results show that this indoor MIMO VLC scheme can achieve excellent performance. When the signal-to-noise ratio is equal to 14 dB, the bit error ratio (BER) reaches the level of 10(-5). So, the communication performance is superior to that of the commonly used schemes based on the channel estimation. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)