Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Sub-band Allocation Algorithm for Reducing Feedback Information Rate for Multiuser OFDMA System

다중 사용자 OFDMA 시스템에서 궤환 정보량을 줄이기 위한 부대역 할당 알고리즘

  • Kwon, Jung-Hyoung (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Rhee, Du-Ho (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Byun, Il-Mu (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Kim, Kwang-Soon (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Whang, Keum-Chan (Department of Electrical and Electronic Engineering, Yonsei University)
  • 권중형 (연세대학교 전기전자공학부) ;
  • 이두호 (연세대학교 전기전자공학부) ;
  • 변일무 (연세대학교 전기전자공학부) ;
  • 김광순 (연세대학교 전기전자공학부) ;
  • 황금찬 (연세대학교 전기전자공학부)
  • Published : 2005.11.26
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Abstract

In this paper, we investigate the method for reducing the amount of feedback in multi-user downlink orthogonal frequency division multiple access (OFDMA) systems. The objective is to maximize the total throughput of the system under the constraints of transmit power. In previous methods, each user in a cell transmits channel quality information (CQI) of its all sub-bands to the base station, which requires extremely high feedback overhead. Thus, we propose an efficient sub-band allocation algorithm in which each user transmits partial CQI and one additional information to reduce the amount of feedback. Simulation results show that we can greatly reduce the amount of feedback than full feedback system.

Keywords