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Compensation for Nonlinear Distortion in OFDM Systems Using a Digital Predistorter Based on the Canonical PWL Model  

Seo, Man-Jung (숭실대학교 정보통신공학과 전송보상 연구실)
Shim, Hee-Sung (숭실대학교 정보통신공학과 전송보상 연구실)
Im, Sung-Bin (숭실대학교 정보통신공학과 전송보상 연구실)
Jung, Jae-Ho (한국전자통신연구원)
Lee, Kwang-Chun (한국전자통신연구원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.1C, 2010 , pp. 65-76 More about this Journal
Abstract
Orthogonal frequency division multiplexing (OFDM) is an attractive technique for achieving high-bit-rate wireless data transmission. However, multicarrier systems such as OFDM show great sensitivity to nonlinear distortion. The OFDM structure requires a summation of a large number of subcarriers for multicarrier modulation, and as a result of this summation large signal envelope fluctuations occur. These fluctuations make OFDM systems to be very sensitive to nonlinear distortion introduced by the high power amplifier (HPA) at the transmitter. In this paper, we propose a canonical piecewise-linear (CPWL) model based digital predistorter to compensate for nonlinear distortion introduced by the high peak-to-average power ratio (PAPR) and the HPA in OFDM systems. The performance of the new predistortion scheme for OFDM systems is evaluated in terms of total degradation (TD) and bit error rate (BER). The simulation results demonstrated that the proposed predistorter achieves significant performance improvement by effectively compensating for the nonlinear distortion introduced by the HPA.
Keywords
OFDM; HPA; predistorter; CPWL; total degradation;
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