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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Feedback Scheme for STBC-Spatial Multiplexing OFDM System with outdated channel feedback

지연된 귀환 채널 정보를 가지는 STBC-공간다중화 OFDM 시스템을 위한 귀환 기법

  • Lim Jong-Kyoung (Graduate school of Information Technology & Telecommunication, Inha University) ;
  • Hwang Hyeon-Chyeol (Graduate school of Information Technology & Telecommunication, Inha University) ;
  • Seo Myoung-Seok (Graduate school, Inha University) ;
  • Kwak Kyung-Sup (Graduate school of Information Technology & Telecommunication, Inha University)
  • 임종경 (인하대학교 정보통신대학원) ;
  • 황현철 (인하대학교 정보통신대학원) ;
  • 서명석 (인하대학교 일반대학원) ;
  • 곽경섭 (인하대학교 정보통신대학원)
  • Published : 2006.04.01
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Abstract

In this paper, we propose an efficient preceding scheme for STBC-Spatial Muiltiplexing OFDM systems. In MIMO systems, the precoder is designed on the assumption that feedback channel information is perfectly known to transmitter and receiver. However, feedback delay and link errors in real environment make the transmitter use the incorrect channel information and consequently cause the performance degradation. The proposed precoder is designed to compensate for the performance degradation by the diversity gain provided by STBC. At the transmitter, the precoder for each subcarrier is constructed by using the index of codebook, subcarrier correlation, and auto correlation of channel. From the simulation results, STBC-spatial multiplexing OFDM outperforms the preceded-spatial multiplexing OFDM at $SER=10^{-3}$ when the Doppler frequency is greater than 60Hz.

본 논문에서는 지연된 귀환 채널 정보를 가지는 STBC-공간다중화 OFDM 시스템을 위한 전처리기 구조를 제안한다. 보통 MIMO 시스템을 위한 전처리기는 귀환 채널 상태 정보를 송신단이 완벽하게 안다는 가정 하에 설계된다. 하지만 실제 시스템에서는 귀환 채널 지연과 링크 오류가 존재하므로 송신단이 부정확한 귀환 채널 정보를 사용하게 되어 시스템 성능이 감소한다. 제안된 전처리기는 이러한 성능 감쇠를 STBC가 제공하는 다이버시티 이득으로 보상할 수 있는 구조로 설계된다. 본 논문에서 제안하는 전처리 기법은 수신단에서 전처리 코드북의 색인을 송신단에 귀환하고 송신단은 전처리 행렬, 부반송파의 상관도, 채널의 자기 상관도를 고려하여 전송 심볼을 전처리한다 모의실험을 통해 STBC-SM OFDM 시스템이 도플러 주파수가 60Hz 이상이 되면 $SER=10^{-3}$ 이하에서 기존의 전처리된 MIMO-OFDM 시스템의 코드북 선택기법에 비해 성능이 우수함을 확인하였다.

Keywords

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