Adaptive resource allocation and capacity comparison of downlink multiuser MIMO-MC-CDMA and MIMO-OFDMA

Ernest S. Lo, Peter W C Chan, Vincent K N Lau, Roger S. Cheng, Khaled Letaief, Ross D. Murch, Wai Ho Mow

Research output: Contribution to journalArticle

68 Citations (Scopus)


In this paper, we examine and compare the potential maximum sum capacity of downlink multiple-input-multiple-output orthogonal frequency division multiple access (MIMO-OFDMA) and multiple-input-multiple-output multicarrier code division multiple access (MIMO-MC-CDMA) in a single-cell multiuser environment with channel side information at the transmitter, with and without a fairness constraint. The resource allocation is formulated as a cross-layer optimization framework and optimal power allocation and user selection algorithms are proposed for both scenarios. We find that for delay-sensitive applications, where fairness is imposed, the performance gain of OFDMA over MC-CDMA is quite large at moderate path loss exponents and number of antennas. However, for delay-insensitive applications, the benefits of OFDMA over MC-CDMA are significantly reduced when the path loss exponent or the number of antennas is large.

Original languageEnglish
Pages (from-to)1083-1092
Number of pages10
JournalIEEE Transactions on Wireless Communications
Issue number3
Publication statusPublished - Mar 2007
Externally publishedYes



  • Adaptive resource allocation
  • Cross-layer design
  • Fairness
  • MIMO
  • Multiuser capacity
  • Multiuser diversity

ASJC Scopus subject areas

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

Cite this