Threshold-based relay selection for detect-and-forward relaying in cooperative wireless networks

  • Authors:
  • Furuzan Atay Onat;Yijia Fan;Halim Yanikomeroglu;H. Vincent Poor

  • Affiliations:
  • Department of Systems and Computer Engineering, Carleton University, Ottawa, ON, Canada and ASELSAN Inc., Ankara, Turkey;Department of Electrical Engineering, Princeton University, Princeton, NJ;Department of Systems and Computer Engineering, Carleton University, Ottawa, ON, Canada;Department of Electrical Engineering, Princeton University, Princeton, NJ

  • Venue:
  • EURASIP Journal on Wireless Communications and Networking
  • Year:
  • 2010

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Abstract

This paper studies two-hop cooperative demodulate-and-forward relaying using multiple relays in wireless networks. A threshold based relay selection scheme is considered, in which the reliable relays are determined by comparing source-relay SNR to a threshold, and one of the reliable relays is selected by the destination based on relay-destination SNR. The exact bit error rate of this scheme is derived, and a simple threshold function is proposed. It is shown that the network achieves full diversity order (N + 1) under the proposed threshold, where N is the number of relays in the network. Unlike some other full diversity achieving protocols in the literature, the requirement that the instantaneous/average SNRs of the source-relay links be known at the destination is eliminated using the appropriate SNR threshold.