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Volume 30 Issue 11
Jan.  2011
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Liang Xue-Jun, Zhu Guang-Xi, Cao Xi, Wang De-Sheng. Analysis of Multiuser Diversity in MIMO-OFDM System Based on Channel Feedback Algorithm[J]. Journal of Electronics & Information Technology, 2008, 30(11): 2570-2574. doi: 10.3724/SP.J.1146.2007.00846
Citation: Liang Xue-Jun, Zhu Guang-Xi, Cao Xi, Wang De-Sheng. Analysis of Multiuser Diversity in MIMO-OFDM System Based on Channel Feedback Algorithm[J]. Journal of Electronics & Information Technology, 2008, 30(11): 2570-2574. doi: 10.3724/SP.J.1146.2007.00846

Analysis of Multiuser Diversity in MIMO-OFDM System Based on Channel Feedback Algorithm

doi: 10.3724/SP.J.1146.2007.00846 cstr: 32379.14.SP.J.1146.2007.00846
  • Received Date: 2007-06-01
  • Rev Recd Date: 2007-12-19
  • Publish Date: 2008-11-19
  • Multiuser diversity can significantly improve wireless communication system performance by exploiting the feedback information that conveys the channel quality. In Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing(MIMO-OFDM) structure, the per subcarrier of per user feedback expenses a substantial amount of wireless resource and decreases spectrum efficiency, so various limited channel feedback scheme is proposed to reduce the feedback load. In this paper, the multiuser diversity gain based on two representative limited channel feedback is investigated, and it is compared with ideal feedback. The close-form expression of average spectrum efficiency is deduced with considering a discrete finite set of candidate constellation sizes for practical system. Extensive simulations are presented to evaluate the multiuser diversity performance in various feedback scheme and the results match with the numeral analysis very well. The limited feedback schemes can reduce the feedback load greatly with no loss in terms of multiuser diversity gain only if the feedback parameters are chosen properly, which provides the instruction to design the channel feedback of practical system.
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