Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Fast Index Search Algorithm for Codebook-based Equal Gain Transmission Beamforming System

코드북을 이용한 동 이득 전송 빔포밍 시스템에서 빠른 인덱스 탐색 기법

  • Park, Noe-Yoon (Division of Information & Communication Engineering, Chungbuk National Univ.) ;
  • Kim, Young-Ju (Division of Information & Communication Engineering, Chungbuk National Univ.) ;
  • Li, Xun (Division of Information & Communication Engineering, Chungbuk National Univ.) ;
  • Lee, Kwan-Seob (Division of Information & Communication Engineering, Chungbuk National Univ.)
  • 박노윤 (충북대학교 정보통신공학과) ;
  • 김영주 (충북대학교 정보통신공학과) ;
  • 이신 (충북대학교 정보통신공학과) ;
  • 이관섭 (충북대학교 정보통신공학과)
  • Published : 2008.12.25
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Abstract

Simple but effective fast codebook searching algorithms for quantized EGT(equal gain transmission) are presented. Using newly defined metric, rough searching selects a few candidate weight vectors. Using the conventional metric, accurate searching determines the optimal vector among the candidates. This strategy reduces the entire searching time. When the number of transmit antenna is two or three, the searching time reduces more than a half less than the conventional searching time. Moreover, the more the size of codebook increases, the more the searching time reduction also increases.

코드북을 이용하는 동 이득 전송 시스템에서 빠른 인덱스 탐색기법을 제안한다. 새로운 간단한 매트릭을 이용하여 빠르게 rough 탐색을 하여 몇 개의 후보 가중치 벡터들을 선택하고, 선택된 벡터들에 기존의 개념을 적용하는 accurate 탐색을 하여 최적의 가중치 벡터를 결정한다. 제안하는 기법은 송신 안테나 수가 2개, 3개일 경우 기존의 방법에 비해 탐색 시간이 반 이하로 줄어들면서, 링크 레벨 성능은 거의 동일하게 유지된다. 또한 코드북 크기가 커질수록 탐색시간이 기존의 방식에 비해 현저히 감소한다.

Keywords

References

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