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

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Comparative Performance Analysis of STBC-OFDM Systems Under Cellular Mobile Environments

셀룰러 이동통신 환경에서 STBC-OFDM 시스템의 성능 비교, 분석

  • Jung Ho-Chul (School of Avionics and Telecommunications, Hankuk Aviation University) ;
  • Chang Eun-Kyoung (School of Avionics and Telecommunications, Hankuk Aviation University) ;
  • Park Hyung-Rae (School of Avionics and Telecommunications, Hankuk Aviation University) ;
  • Jang Eun-Young (School of Electrical and Electronic Engineering, Kongju National University) ;
  • Kim Chang-Ju (Group of Radio Technology Development, ETRI)
  • 정호철 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 장은경 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 박형래 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 장은영 (국립 공주대학교 전기전자공학부) ;
  • 김창주 (한국전자통신연구원 전파기술연구그룹)
  • Published : 2006.03.01
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Abstract

In this paper, we compare the performance of three representative STBC schemes, Alamouti's, Tarokh's and quasi-orthogonal schemes under cellular mobile environments when they are applied to the OFDM system. We first study the encoding algorithms of the STBC schemes along with the development of adequate demodulation algorithms. The OFDM parameters are selected by considering the Wibro system and adequate modulation schemes are assigned for each STBC schemes according to the transmission rate from 2bps/Hz to 4bps/Hz. The STBC-OFDM systems employ Walsh orthogonal codes covered along the frequency domain in order to estimate the channel information for different transmit antennas. We finally compare the performance of the STBC-OFDM systems according to the transmission rate through computer simulations in various mobile channel environments.

본 논문에서는 대표적인 STBC 기법인 Alamouti., Tarokh, quasi-orthogonal 방식을 OFDM 시스템에 적용하여, 셀룰러 이동통신 환경에서 각 기법간의 성능을 비교, 분석한다. 먼저 각 STBC 기법들의 부호화 방식을 고찰하고 각 알고리즘 별로 적절한 복조 알고리즘을 제시한다. OFDM 시스템 파라메타는 Wibro 시스템을 고려하여 설정하며 2bps/HB에서 4bps/Hz까지의 전송율에 대해서 STBC 기법별로 적절한 변조방식을 채택한다. 또한, 안테나별로 채널 추정이 가능하도록 주파수 영역에서 Walsh 코드를 이용하여 프리앰블을 코딩한다. 끝으로, 여러 가지 이동통신 채널 환경에서 STBC-OFDM 시스템의 전송율에 따른 성능을 시뮬레이션을 통해 비교, 분석한다.

Keywords

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