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A New Method on the Nonlinear Distortion Analysis in the OFDM Communication System  

이동훈 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
정기호 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
유흥균 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.13, no.6, 2002 , pp. 538-545 More about this Journal
Abstract
In the orthogonal frequency division multiplexing (OFDM) system, the nonlinear distortion in the high power amplifier(HPA) degrades the system performance because of the high peak-to-average power ratio (PAPR). In this paper, a semi-analytical method is newly proposed for the performance evaluation of the nonlinearly distorted OFDM communication system. In the proposed method, at first, the probability density function (pdf) of the PAPR is generated by computer simulation. Then, mean and variance of the non-linear distortion noise process are computed. Next, the overall BER is found by the analytical method. When the equivalent SSPA model is applied in case of the QPSK/16-QAM and AWGN channel, the BER is calculated for the variation of the IBO(input back-off) and PAPR parameter. It is shown that the results by proposed method are very similar to those of the conventional Monte-Carlo method. The computation time can be considerably reduced than the conventional method that depends on the magnitudes of BER and IBO.
Keywords
Solid-State-Power Amplifier, SSPA; Peak to Average Power Ratio, PAPR; BER Analysis;
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