Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance Improvement of OFDM System Using Transmit Diversity with Space-Time Block Coding

  • Yorwittaya, N. (Department of Information Engineering, Faculty of Engineering, King Mongkut′s Institute of Technology) ;
  • Chamchoy, M. (Department of Information Engineering, Faculty of Engineering, King Mongkut′s Institute of Technology) ;
  • Supanakoon, P. (Department of Information Engineering, Faculty of Engineering, King Mongkut′s Institute of Technology) ;
  • Tangtisanon, P. (Department of Information Engineering, Faculty of Engineering, King Mongkut′s Institute of Technology)
  • Published : 2002.07.01
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Abstract

Orthogonal frequency division multiplexing (OFDM) is a special technique for communication systems which can support the high data rate transmission with sufficient robustness to fading channels. Tansmitter diversity with space-time block coding (STBC) is an attractive transmission scheme to improve the performance of systems. In this paper, we compare the performance of space-time block coded OFDM systems with that of conventional OFDM systems over fast fading channels. The block-interleaved (BI) STBC and frequency hopping (FH) OFDM are proposed in the study to provide the maximum achievable diversity gains. As the simulation results, the STBC OFDM, Bl-STBC OFDM and Bl-STBC FH-OFDM provide the much improved performance over the conventional OFDM. And the Bl-STBC FH-OFDM also provide the better performance than the STBC OFDM and Bl-STBC OFDM, especially, in the case of the two transmit antennas are employed while BI-STBC FH-OFDM can maintain the same data rate of 12 Mbps.

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