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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance Analysis of Dual-layer Beamforming Technique for MIMO-OFDM System

MIMO-OFDM 시스템에서 이중계층 빔포밍 기법의 성능분석

  • Li, Xun (Division of Information & Communication Engineering, Chungbuk National Univ.) ;
  • Kim, Young-Ju (Division of Information & Communication Engineering, Chungbuk National Univ.) ;
  • Park, Noe-Yoon (Division of Information & Communication Engineering, Chungbuk National Univ.)
  • 이신 (충북대학교 정보통신공학과) ;
  • 김영주 (충북대학교 정보통신공학과) ;
  • 박노윤 (충북대학교 정보통신공학과)
  • Received : 2010.01.07
  • Published : 2010.05.25
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Abstract

This paper propose a dual-layer beam-forming technique for MIMO-OFDM systems. Dual-layer beam-forming is a capacity enhancing technique to transmit two streams of source data with more than two transmit and receive antennas. Beamforming is a technique to enhance the link-level performances gain using antenna array with the small inter element distance. The proposed scheme can obtain both high capacity of spatial multiplexing and antenna array gain of beamforming for MIMO-OFDM systems. Therefore, it provides better BER performance than the traditional spatial multiplexing and beamforming techniques under the same simulation environment.

본 논문에서는 MIMO-OFDM 시스템에서 이중계층 (dual layer) 빕포밍 (beamforming) 기법을 제안한다. 이중계층 빔포밍 기법은 두 개 이상의 송신 및 수신 안테나를 이용하는 공간 다중화 (spatial multiplexing)에서 두 개의 스트림 (stream)을 이용하여 전송 용량을 증대시키는 기술이며, 빔포밍은 어레이 안테나에서 수신 신호의 방향을 추정하여 수신 및 송신에서 어레이 이득을 얻는 기술이다. 제안되는 기법은 MIMO-OFDM 구조에서 공간 다중화 기술을 적용해 높은 채널용량이득을 얻고, 동시에 어레이 안테나를 이용한 이득을 얻을 수 있으므로 기존에 OFDM 시스템에 공간다중화만 적용하거나, 어레이 안테나만 적용한 것에 비해, 시스템 성능을 획기적으로 높일 수가 있다.

Keywords

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