Symbol-Based Space Diversity for Coded OFDM Systems

Defeng Huang, Khaled Ben Letaief

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The authors present a coded orthogonal frequency division multiplexing (COFDM) system with multiple-input/multiple-output (multiple transmit and/or multiple receive) antennas for high-rate wireless data transmission. A symbol-based space diversity technique, which can take advantage of the inherent space diversity, is proposed. In contrast to conventional subcarrier-based space diversity, it is shown that the proposed technique can be implemented using only one discrete Fourier transform block and the same weighting coefficients for the whole OFDM symbol. This significantly reduces the system complexity while achieving almost the same diversity order as that of the traditional space diversity approach. They also propose an iterative algorithm to obtain the antenna weighting coefficients. Simulation results show that the proposed algorithm converges fast and approaches the global optimal solution for most channel realizations. It is also shown that, when the proposed technique is employed in a time division duplex scenario, where the uplink and downlink channels are reciprocal, the system complexity can be further reduced.

Original languageEnglish
Pages (from-to)117-127
Number of pages11
JournalIEEE Transactions on Wireless Communications
Volume3
Issue number1
DOIs
Publication statusPublished - 1 Jan 2004

Keywords

  • Broad-band wireless communications
  • Multiple-input/multiple-output (MIMO) systems
  • Orthogonal frequency division multiplexing (OFDM)
  • Space diversity

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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