Distributed BLAST with relay selection for multi-antenna AF relaying

Abstract

By examining the diversity-multiplexing tradeoff (DMT) of an amplify-and-forward (AF) multi-antenna multi-relay network, a procedure to select the optimal number of relays and relay candidates is established. Subsequently, a distributed BLAST transmission scheme in conjunction with successive nulling and cancellation at destination is proposed to achieve the optimal DMT. Illustrative results indicate that the proposed method can significantly enhance the outage probability performance, and for a selected number of relays in use, the performance enhancement can be further improved by increasing the number of available relays in the AF network. © 2010 John Wiley & Sons, Ltd.