KSII Transactions on Internet and Information Systems (TIIS)

  • 제2권4호
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  • Pages.209-221
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  • 2008
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  • 1976-7277(pISSN)
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  • 1976-7277(eISSN)
한국인터넷정보학회 (Korean Society for Internet Information)
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A Composite LMMSE Channel Estimator for Spectrum-Efficient OFDM Transmit Diversity

  • Seo, Jeong-Wook (School of Electrical and Electronic Eng., Yonsei University) ;
  • Jeon, Won-Gi (Advanced Mobile Technology Research Center, Korea Electronics Technology Institute) ;
  • Paik, Jong-Ho (Advanced Mobile Technology Research Center, Korea Electronics Technology Institute) ;
  • Jo, Min-Ho (School of Information and Communication Eng., Sungkyunkwan University) ;
  • Kim, Dong-Ku (School of Electrical and Electronic Eng., Yonsei University)
  • 발행 : 2008.08.25
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초록

In this paper, we propose a subcarrier allocation method and a composite linear minimum mean square error (LMMSE) channel estimator to increase spectrum efficiency in orthogonal frequency division multiplexing (OFDM) transmit diversity. The pilot symbols for OFDM transmit (Alamouti) diversity are exclusively allocated in two OFDM symbols in different antennas, which causes serious degradation of spectrum efficiency. To reduce the number of pilot symbols, our subcarrier allocation method uses repetition-coded data symbols, and the proposed channel estimator maintains good bit error rate (BER) performance.

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