IQ Imbalance Compensation Based on Cordic Algorithm in VLC-OFDM System

Abstract

This study investigates the problem of in-phase and quadrature (IQ) imbalance in the visible light communication (VLC) system. The effectiveness of the blind compensation method based on coordinate rotation digital computer (cordic) algorithm against the IQ imbalance is discussed. We further verify the proposed compensation method with QPSK and 16QAM signals respectively, with simulated impairments caused by the light emitting diode (LED) nonlinearity. Additionally, the analysis of Monte Carlo simulation under the assumption of different signal-to-noise ratio (SNR) is showed where in some cases, the compensation intensity increases as the SNR increases.