A VHDL Implementation of Baseband Predistorter for the Compensation of Nonlinear Distortion in OFDM Systems

OFDM시스템에서 비선형 왜곡 보상을 위한 기저대역 사전왜곡기의 VHDL 구현

The OFDM (orthogonal frequency division multiplexing) systems are based en the transmission of a given set of signals on multiple orthogonal subcarriers, resulting in large variation in amplitude of transmit signals, and severe distortion by nonlinear characteristic of a high power amplifier (HPA) is unavoidable. We propose in this paper a computationally efficient structure of a baseband predistorter for compensation of nonlinear distortion by the HPA. Moreover, a predistorter which can be utilized in high speed transmission systems such as wireless ATM based on the proposed structure is designed using VHDL, and synthesized by the Synopsys tool.