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

OFDM 통신 시스템에서 비선형 왜곡분석의 새로운 분석기법

  • 이동훈 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • 정기호 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • 유흥균 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
  • Published : 2002.07.01

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

References

  1. Proc. of Vehicular Technology Conference' 2000 v.1 A block coding scheme for peak-to-average power ratio reduction in an orthogonal frequency division multiplexing system H. J. Ahn;Y. Shin;S. B. Im
  2. Proc. of ICC '2000 v.2 The influence of non-linear distortion on OFDM bit error rate C. van den Bos;M.H.L. Kouwenhoven;W.A. Serdijn
  3. IEEE Transactions on Vehicular Technology v.47 no.1 A Hybrid analytical simulation procedure for performance evaluation in M-QAM-OFDM schemes in presence of nonlinear distortions G. Santella;F. Mazzenga
  4. IEEE Transactions on Consumer Electronics v.43 no.3 The effect of nonlinearity on a QPSK-OFDM-QAM signal C. L. Liu
  5. IEE Electronic Letters v.32 no.5 Reduction of peak to mean ratio of multicarrier modulation using cyclic coding D. Wulich
  6. Proc. of Design Automation and Test in Europe'2001 Efficient Bit-Error-Rate Estimation of Multicarrier Transceivers G. Vandersteen;P. Wambacq;Y. Rolain;J. Schoukens;S. Donnay;M. Engels;I. Bolsens