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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지

A Comparison of Opportunnistic Transmission Schemes with Reduced Channel Information Feedback in OFDMA Downlink

순방향 직교 주파수분할 다중접속 시스템에서 부분적 채널정보 궤환을 이용한 전송방식의 비교분석

  • 윤석현 (단국대학교 전자전기공학부)
  • Published : 2008.07.30
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Abstract

In this paper, we consider downlink throughput performances of multiuser orthogonal frequency division multiplexing with reduced channel information feedback schemes. Specifically, two types of reduced feedback schemes, namely, 1-bit per sub-carrier and selective feedback scheme are considered and compared with each other in terms of average network throughput. Since the strict throughput comparison for given number of feedback bits per user is quite difficult, rather we compare their general behaviors in various system configurations with different system parameters, which can give us an insight into practical system design with those reduced feedback schemes.

본 논문에서는 부분적 채널 피드백 정보를 이용하는 다중사용자 직교 주파수 분할다중화 시스템의 하향링크 전송성능을 고려한다. 특히, 두 종류의 부분적 채널 정보 궤환 방식을 고려하는데 첫째는 부반송파 당 1비트의 정보만을 이용하는 1비트(1bit per sub-carrier) 궤환 방법과 선택적으로 채널정보를 궤환하는 선택적 궤환(selective feedback) 방법을 비교 분석한다. 사용자당 주어진 피드백 비트 수에 대한 절대적인 비교 분석은 매우 어려우므로 대신에 각 방법에서의 설계 파라미터에 따른 성능 곡선을 분석함으로써 실제 시스템에의 적용에 필요한 정보를 제공하고자 한다.

Keywords

References

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