LED-based identification systems using wavelength division-adaptive interference cancellation for frequency offset correction

This paper studies the performance degradation caused by frequency offset induced by optical Doppler shift in light emitting diode (LED)-based identification (LED-ID) systems, which integrate visible light communication (VLC). Through computer simulations and theoretical analysis, we can observe that frequency offset plays a significant role in the communication performance deterioration due to inter-carrier interference (ICI) and common phase error (CPE). Therefore, a scheme to correct the frequency offset by using wavelength division-adaptive interference cancellation (WD-AIC) was proposed. The main approach is to compare and analyze the proposed scheme and the conventional scheme, which employs convolutional coding. Finally, the proposed scheme shows a better BER performance than its channel coding counterpart when Doppler shift becomes severe.