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 Performance Analysis of Space-Time Block Codes for OFDM Systems Under Rayleigh Fading Environments

레일라이 페이딩 환경에서 OFDM 시스템을 위한 시공간 블록 코드의 성능 비교, 분석

  • 김영선 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 정호철 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 이상호 (삼성전자 네트웍 사업부) ;
  • 김창주 (한국전자통신연구원 전파기술연구그룹) ;
  • 박형래 (한국항공대학교 항공전자 및 정보통신공학부)
  • Published : 2004.10.01
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Abstract

In this paper we design STBC-OFDM systems by applying several STBC schemes to the OFEM system and show their comparative analysis results obtained through computer simulations under Rayleigh fading environments, considering the effect of channel estimation error. We first consider the space-time coding algorithms of major STBC schemes, together with their demodulation algorithms. We then select the OFDMparameters considering mobile environments and design the STBC-OFDM systems by choosing one of digital modulation schemes such as QPSK, BPSK, 16QAM, 64QAM, and 256QAM according to the transmission rate, and describe the block diagrams of the demodulator and channel estimator. We finally compare and analyze the BER performances of the STBC-OFDM systems according to the transmission rate and the number of receive antennas.

본 논문에서는 여러 STBC 기법들을 OFDM 시스템에 적용하여 STBC-OFDM 시스템을 설계하고 레일라이 페이딩 환경에서 채널추정 오차를 고려하여 각 시스템의 성능을 비교, 분석한다 먼저, 대표적인 STBC 방식들에 대한 시공간 부호화와 복조 알고리즘을 고찰한다. 또한, 이동통신 환경을 고려하여 OFDM 파라메타를 설정하고 전송율에 따라 QPSK, 8PSK, 16QAM, 64QAM, 256QAM 등의 변조방식을 선택할 수 있도록 STBC-OFDM 시스템을 설계하며 STBC-OFDM 시스템의 데이터 복조기와 채널 추정기의 구조를 제시한다. 끝으로, 레일라이 환경에서 전송율과 수신 안테나의 수에 따른 STBC-OFDM 시스템의 성능을 시뮬레이션을 통해 비교, 분석한다.

Keywords

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