The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Performance Analysis of IMD-Reduction-based Tone Reservation Method for the Protection of Nonlinear Distortion in the OFDM Communication System

OFDM 통신 시스템에서 비선형 왜곡 방지를 위한 IMD 저감 기반의 Tone Reservation 방식의 성능 분석

  • Byeon, Heui-Seop (Dept. of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University) ;
  • Kim, Nam-Il (Mobile Packet Transmission Research Team, Mobile Telecommunication Research Division, ETRI) ;
  • Kim, Young-Hoon (Mobile Packet Transmission Research Team, Mobile Telecommunication Research Division, ETRI) ;
  • Ryu, Heung-Gyoon (Dept. of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
  • 변희섭 (충북대학교 전자공학과 및 컴퓨터정보통신연구소) ;
  • 김남일 (한국전자통신연구원 이동통신연구단 이동패킷전송연구팀) ;
  • 김영훈 (한국전자통신연구원 이동통신연구단 이동패킷전송연구팀) ;
  • 유흥균 (충북대학교 전자공학과 및 컴퓨터정보통신연구소)
  • Published : 2006.10.31
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Abstract

The OFDM system is very good for the high data rate communication system. However, OFDM system has a high PAPR problem. This makes the OFDM signal distorted through the nonlinear HPA(High Power Amplifier). To solve this problem, generally, simple PAPR reduction methods have been considered. However, in this paper, we introduce IMD reduction method instead of PAPR. PAPR is the signal property and the IMD is signal component of the HPA output, which degrades the communication quality. So, instead of PAPR we want to use the IMD reduction method. This is to transmit a signal with the smallest distortion by considering the third order nonlinearity when the data is recovered. We use the TR method that was proposed for the PAPR reduction and we find out the BER performance of two methods. As results, we show that the IMD reduction method improves better BER performance than the PAPR reduction.

OFDM(Orthogonal Frequency Division Mulitiplexing) 시스템은 유무선 고속 디지털 통신 분야에 응용되고 있다. 그러나 OFDM은 다수의 반송파를 이용하기 때문에 동위상의 신호가 합쳐져 높은 PAPR(Peak to Average Power)이 발생하고, 그로 인해 비선형 증폭기를 거치면서 신호가 왜곡되는 문제점이 발생한다. 이러한 문제의 대책으로 대개 PAPR을 낮게 하여 전송하는 기법을 이용한다. 그러나 본 논문에서는 가장 낮은 PAPR을 찾는 PAPR 저감 기법 대신에, 비선형성으로 나타난 IMD(Inter-Modulation Distortion)를 저감시키게 하는 방법을 연구한다. IMD 감소 기법은 비선형 입출력 특성 다항식의 3차 항에 의해 발생된 왜곡 신호 중에 최소 왜곡 신호를 수신기로 전송하는 방식이다. 본 논문에서는 기존에 PAPR을 저감하기 위하여 제안된 TR(Tone Reservation) 기법을 사용하되, PAPR 자체를 저감하기 보다는 비선형 HPA를 거친 후 발생하는 IMD 성분을 저감하는 방식을 제안한다. 그리고 TR 기법을 이용하여 PAPR 저감과 제안된 IMD 저감의 시뮬레이션 비교 분석 결과, 3차 비선형에 대해 IMD 저감이 PAPR 저감에 비해 BER 성능이 좀 더 향상되었다.

Keywords

References

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