Analysis of ICA MIMO-OFDM VLC system with different FOV based photodetectors

In this paper, the performance analysis of ICA MIMO-OFDM VLC system using the number of photodetectors with the same field of view (1-FOV) and two different field of view (2-FOV) has been carried out. Use of MIMO leads to a complex channel matrix and increases the complexity of channel estimation. Independent component analysis (ICA) is applied to reduce the complexity & convert MIMO-OFDM signals into SISO-OFDM signals. Frequency modulator has been further used in this scheme to reduce the peak to average power ratio (PAPR) of an OFDM signal and it also reduces correlation between MIMO-OFDM signals & enhance the separation performance of ICA. Simulation results in 4×4 MIMO-VLC indoor environment show the BER of the scheme is approx 10
^-4
level at SNR of 12 dB with 2-FOV optical receivers, which is better than conventional 1-FOV optical receivers. On the other hand, the BER obtained for the proposed scheme through minimum mean square estimation (MMSE) is approx 10
^-5
at 12 dB SNR which is better than least square estimation (LSE).