Journal of the Institute of Convergence Signal Processing (융합신호처리학회논문지)

The Korea Institute of Convergence Signal Processing (한국융합신호처리학회)
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Multiple Symbol Detection of Trellis coded Differential space-time modulation for OFDM

OFDM에서 트렐리스 부호화된 차동 시공간 변조의 다중 심벌 검파

  • 유항열 (관동대학교 정보기술공학부) ;
  • 한상필 (관동대학교 정보기술공학) ;
  • 김진용 (관동대학교 정보기술공학) ;
  • 김성열 (관동대학교 정보기술공학) ;
  • 김종일 (관동대학교 정보기술공학부)
  • Published : 2004.07.01
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Abstract

Recently, OFDM and STC techniques have been considered to be candidate to support multimedia services in the next generation mobile radio communications and have been developed the many communications systems in order to achieve the high data rates. In this paper, we propose the Trellis-Coded Differential Space Time Modulation-OFDM system with multiple symbol detection. The Trellis-code performs the set partition with unitary group codes. The Viterbi decoder containing new branch metrics is introduced in order to improve the bit error rate (BER) in the differential detection of the unitary differential space time modulation. Also, we describe the Viterbi algorithm in order to use this branch metrics. Our study shows that such a Viterbl decoder improves BER performance without sacrificing bandwidth and power efficiency.

최근에 OFDM과 시공간 부호화(Space-Time Code, STC)는 차세대 이동 통신에서 고속의 신뢰성 있는 통신을 위해 각광받고 있다. 본 논문에서는 다중경로 페이딩 채널에서 고속의 데이터를 전송하고자 할 경우에 성능을 향상시키고자 트렐리스 부호화된(Trellis-Coded, TC) 차동 시공간 변조(Differential Space Time Modulation, DSTM)를 사용한 OFDM에서 다증 심벌 검파 시스템을 제안한다. 차동 시공간 부호화된 OFDM의 성능을 향상시키기 위해 DUSTM(differential unitary space-time modulation)을 이용하여 송신기를 설계하고 수신단에서 다중 심벌 검파를 수행하는 수신기와 디코딩 알고리듬을 개발하며, 이를 위한 새로운 가지 메트릭을 유도한다.

Keywords

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