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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Performance Analysis of Multicarrier Code Selection CDMA System for PAPR Reduction in Multipath Fading Channel

PAPR을 줄이기 위한 Multicarrier Code Select CDMA시스템의 다중 경로 페이딩 채널에서 성능 분석

  • 류관웅 (영남대학교 정보통신공학과 이동통신 연구실) ;
  • 박용완 (영남대학교 정보통신공학과 이동통신 연구실) ;
  • 홍인기 (경희대학교 전자정보공학부 이동통신연구실) ;
  • 김명진 (한국외국어대학교 정보통신공학과)
  • Published : 2004.12.01
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Abstract

Multicarrier direct sequence code-division multiple access CDMA(MC DS-CDMA) is an attractive technique for achieving high data rate transmission even if the potentially large peak-to-average power ratio(PAPR) is an important factor for its application. On the other hand, code select CDMA(CS-CDMA) is an attractive technique with constant amplitude transmission of multicode signal irregardless of subchannels by introducing code selection method. In this paper we propose a new multiple access scheme based on the combination of MC DS-CDMA and CS-CDMA. Proposed scheme, which we called MC CS-CDMA, includes the sutclasses of MC DS-CDMA and CS-CDMA as special cases. The performance of this system is investigated for multipath Sequency selective fading channel and maximal ratio combining with rake receiver. In addition the PAPR of proposed system is compare with that of both MC BS-CDMA and CS-CDMA. Simulation results show that proposed system improves PAPR reduction than MC DS-CDMA at the expense of the complexity of receiver and the number of available non. Also, the numerical result shows that the proposed system is better performance than MC DS-CDMA due to the increasing processing gain and the number of time diversity gain.

최근 MC DS-CDMA시스템은 차세대 고속 데이타 전송을 위해 활발히 연구되고 있지만 높은 PAPR(peak-to-average power ratio)을 가지는 단점이 있다. 반면 CS-CDMA시스템은 코드 선택 방식을 사용함으로써 부 채널수에 상관없이 일정한 크기의 송신 신호로 인해 낮은 PAPR가진다. 본 논문에서는 MC DS-CDMA와 CS-CDMA의 결합한 새로운 다중접속 방식인 MC CS-CDMA(multicarrier code select CDMA)을 제안한다. MC CS-CDMA 시스템은 특별한 경우로서 MC DS-CDMA시스템과 CS-CDMA시스템을 포함한다. MC CS-CDMA 시스템은 주파수 선택적 다중경로 채널과 MRC를 가진 레이크 수신기에서 성능 및 PAPR을 비교 분석한다. 시뮬레이션 결과 MC CS-CDMA 시스템이 CS-CDMA에 비해 높은 PAPR을 가지지만 MC DS-CDMA에 비해 PAPR을 줄일 수 있다. 또한 수치해석의 결과 MC CS-CDMA 시스템이 확산 이득과 시간 다이버시터 이득의 증가로 인해 MC DS-CDMA에 비해 우수한 성능을 가진다. 그러나, MC CS-CDMA 시스템은 수신기의 복잡도 증가와 가입할 수 있는 사용자수가 감소하는 단점을 가진다.

Keywords

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