The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Comparative Analysis of Orthogonal SIBC Algorithms in Spatially Correlated Rayleigh Fading Environments

공간 코릴레이션이 존재하는 레일리이 페이딩 환경에서 직교 STBC 알고리즘의 성능 비교 분석

  • 장은경 (삼성전자 통신연구소) ;
  • 박형래 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 김창주 (한국전자통신연구원 전파기술연구그룹)
  • Published : 2008.10.30
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Abstract

In this paper we derive the theoretical performance of orthogonal STBC algorithms in spatially correlated Rayleigh fading environments and compare their performances for various correlation conditions. We first derive the theoretical BER of the orthogonal STBC algorithms for both M-ary PSK and M-ary QAM modulation schemes by using the eigenvalues of the channel correlation matrix and then investigate the effect of the spatial correlation on the performance for various transmission rates of $1{\sim}4bps/Hz$. Performance analysis illustrates that the Alamouti scheme provides the better performance than the Tarokh scheme for all the transmission rates in highly correlated fading environments with a correlation being larger than 0.9.

본 논문에서는 공간 코릴레이션이 존재하는 레일리이 페이딩 환경에서 직교 STBC 알고리즘들의 성능을 이론적으로 유도하고 여러 가지 코릴레이션 조건에서 각 방식의 성능을 비교, 분석한다. 먼저, 채널 코릴레이션 행렬의 고유값 (eigenvalues)을 이용하여 M-ary PSK와 M-ary QAM 변조 방식에 대한 직교 STBC 알고리즘의 비트 에러율을 유도한 다음, $1{\sim}4bps/Hz$의 전송율에 대해 공간 코릴레이션에 의한 성능의 영향을 분석한다. 성능 분석 결과, 공간 코릴레이션이 0.9이상으로 비교적 큰 환경에서는 모든 전송율에 대해 Alamouti 방식이 Tarokh 방식 보다 우수한 성능을 제공함을 알 수 있었다.

Keywords

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