The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Complexity Reduction Algorithm for Quantized EGT Codebook Searching in Multiple Antenna Systems

다중 안테나 시스템에서 양자화된 동 이득 전송 기법의 코드북 검색 복잡도 감쇄 기법

  • Park, Noe-Yoon (School of Information & Communication Engineering, Chungbuk National University) ;
  • Kim, Young-Ju (College of Electrical & Computer Engineering, Chungbuk National University)
  • 박노윤 (충북대학교 정보통신공학과) ;
  • 김영주 (충북대학교 전자정보대학)
  • Published : 2011.01.31
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Abstract

Reduced complexity codebook searching for Quantized Equal Gain Transmission(QEGT) is proposed over MIMO-OFDM systems. QEGT codebook is divided into M groups of Q index members. Each group has a representative index. At the 1st stage only the representative indices are searched then the best index is selected. At the 2nd stage the optimum index is determined only among the group of the selected representative index. This strategy reduces the overall index search algorithm comparing to the conventional methods. Monte-Carlo simulation shows that the searching complexity is reduced, but the link-level performance is still almost the same as the conventional methods when the number of transmission antennas are 3 to 7.

최대 비 전송 기법에 비해 송신단의 고출력 증폭기에서 발생하는 비선형 왜곡 전달 특성에 강인한 QEGT 코드북 기반의 동 이득 전송 기법에 대해 개선된 인덱스 검색 기법을 제안, 이를 MIMO-OFDM 시스템에 적용한다. 제안하는 검색 기법은 QEGT 코드북을 Q개의 인덱스들로 구성된 M개의 그룹으로 분할한 후, 선택된 최적의 그룹 내 인덱스들 중에서 피드백 인덱스를 결정하는 것으로 기존 검색 기법에 비해 피드백 인덱스 결정을 위한 전체 계산량이 감소하는 장점이 있다. Monte-Carlo 시뮬레이션을 통해 송신 안테나 수가 3~7인 경우, 인덱스 검색 수가 감소하면서도 기존 검색 기법과 거의 동일한 성능을 보임을 확인한다.

Keywords

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