Turbo coded multiple-antenna systems for near-capacity performance

  • Authors:
  • Yeong-Luh Ueng;Chia-Jung Yeh;Mao-Chao Lin;Chung-Li Wang

  • Affiliations:
  • Department of Electrical Engineering and the Institute of Communications Engineering, National Tsing Hua University, Hsinchu, Taiwan, R.O.C.;Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.;Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.;Department of Electrical and Computer Engineering University of California, Davis, CA

  • Venue:
  • IEEE Journal on Selected Areas in Communications - Special issue on capaciyy approaching codes
  • Year:
  • 2009

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Abstract

For a turbo coded BLAST (Bell LAbs Space-Time architecture) system with Nt transmit antennas and Nr receive antennas, there is a significant gap between its detection threshold and the capacity in case Nt Nr. In this paper, we show that by introducing a convolutional interleaver with block delay between the BLAST mapper and the turbo encoder, the threshold can be improved. Near-capacity thresholds can be achieved for some cases. To take advantage of the low detector complexity in Alamouti STBC (space-time block code), we also investigate a STBC system, which is the concatenation of the Alamouti STBC with a turbo trellis coded modulation. By using a proper labelling and adding a convolutional interleaver with block delay to such a STBC system, we achieve both lower error floors and lower thresholds.