Impact of CSIT on the tradeoff of diversity and spatial multiplexing in MIMO channels

  • Authors:
  • Xiao Juan Zhang;Yi Gong

  • Affiliations:
  • School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore

  • Venue:
  • ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2
  • Year:
  • 2009

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Abstract

In this paper, we investigate the impact of imperfect channel state information at the transmitter (CSIT) on the fundamental tradeoff of diversity and multiplexing in multi-input multi-output (MIMO) fading channels. We show that through power adaptation, a higher diversity gain as well as a more efficient diversity-multiplexing tradeoff can be achieved than the reported results in literature. Our analysis reveals that imperfect CSIT significantly improves the achievable diversity gain while enjoying the full spatial multiplexing gain.