The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Scalable Companding Function for Peak-to-Average Power Ratio Reduction in OFDM Systems

OFDM 시스템에서 PAPR 감소를 위한 스케일러블 컴팬딩 함수

  • 이지혜 (경희대학교 전자전파공학과) ;
  • 왕진수 (경희대학교 전자전파공학과) ;
  • 박재철 (경희대학교 전자전파공학과) ;
  • 김윤희 (경희대학교 전자전파공학과)
  • Received : 2010.02.03
  • Accepted : 2010.04.06
  • Published : 2010.04.30
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Abstract

In this paper, we consider a low-complex companding technique for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. For the technique, we propose a novel companding function to compensate the problem of the conventional companding functions which are difficult to design complying with system requirements and deteriorate the bit error rate (BER) performance significantly. The proposed scalable companding function can provide an arbitrary value of the maximum PAPR with which the BER performance changes gracefully. In addition, the proposed companding function can be designed readily according to the PAPR and BER performance required by the system and is observed to provide better BER performance than the conventional clipping and $\mu$-low companding schemes under the similar PAPR condition.

본 논문은 OFDM (orthogonal frequency division multiplexing) 시스템에서 PAPR (peak-to-average power ratio) 감소 기법으로 복잡도가 낮은 컴팬딩 (companding) 기법을 고려한다. 기존의 컴팬딩 함수는 시스템 요구 사항에 따라 설계하기 어렵고 비트오류율 성능 열화가 매우 큰 단점이 있다. 이에 본 논문에서는 임의의 최대 PAPR 값을 제공하고 그에 따라 비트오류율 성능이 점진적으로 바뀌는 스케일러블 컴팬딩 함수를 제안한다. 제안하는 컴팬딩 함수는 시스템이 요구하는 PAPR 성능과 비트오류율 성능에 따라 쉽게 설계할 수 있으며, 모의실험 결과 같은 PAPR 조건에서 기존의 클리핑이나 $\mu$-low 기법보다 우수한 비트오류율 성능을 제공함을 볼 수 있다.

Keywords

References

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