High Power Efficiency and Low Nonlinear Distortion for Wireless Visible Light Communication

High power efficiency and low nonlinear distortion is very important for wireless visible light communication system. OFDM (orthogonal frequency division multiplexing) system has been studied a lot as the method to transmit high speed data in wireless visible light communication system. However, OFDM system has drawbacks which are non-linear distortion by high PAPR characteristic and ICI problem occurred by RF impairments. In wireless visible light communication system, output power of visible light which is generated by driven current of LED (light emission diode) has non-linear characteristic. Therefore, transmitted signal is distorted by it. Researches for receive performance of visible light output which is emitted by non-linear LED transfer function and OFDM signal have been studied. In this paper, we suggest a new PAPR reduction technique to reduce non-linear distortion of LED for reducing the PAPR. Also, we propose an adaptive ICI suppression algorithm in order to improve receive performance through enhanced SNR (signal to noise power ratio) by an adaptive channel estimation method of proposed algorithm. Improved performance of proposed system is verified through computer simulation.