A relay assisted cooperative transmission protocol for wireless multiple access systems

  • Authors:
  • Zhiguo Ding;Kin K. Leung;Dennis L. Goeckel;Don Towsley

  • Affiliations:
  • School of Electrical, Electronic, and Computer Engineering, Newcastle University, Newcastle, UK;Electrical and Electronic Engineering Department, Impenal College, London, UK;Dept. of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA;Department of Computer Science, the University of Massachusetts, Amherst, MA

  • Venue:
  • IEEE Transactions on Communications
  • Year:
  • 2010

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Abstract

In this paper, we propose a spectrally efficient cooperative transmission protocol for multiple access scenarios. The key feature is to utilize multi-user diversity and fully exploit the dynamic nature of radio propagation. In particular, by carefully scheduling the multiple sources and relays' transmissions, a source with a poor connection to the destination can have higher priority to obtain help from a relay with better channel condition. As a result, the full diversity gain is achievable even though only a fraction of relays is scheduled to help each user. We developed an achievable diversity-multiplexing tradeoff for the proposed transmission protocol to assist performance evaluation. When the number of relays is large, the diversity-multiplexing tradeoff achieved by the proposed scheme can approximate the optimal multiple-input single-output upper bound. Both analytical and numerical results show that the proposed protocol outperform other comparable schemes in most conditions.