Cooperative Decode-and-Forward ARQ Relaying: Performance Analysis and Power Optimization

Abstract--In this paper we develop a new analytical methodology for the evaluation of the outage probability of cooperative decode-and-forward (DF) automatic-repeat-request (ARQ) relaying under packet-rate fading (fast fading or block fading) channels, where the channels remain fixed within each ARQ transmission round, but change independently from one round to another. We consider a single relay forwarding Alamoutibased retransmission signals in the cooperative ARQ scheme. In particular, (i) we derive a closed-form asymptotically tight (as SNR ) approximation of the outage probability; (ii) we show that the diversity order of the DF cooperative ARQ relay scheme is equal to 2 - 1, where is the maximum number of ARQ (re)transmissions; and (iii) we develop the optimum power allocation for the DF cooperative ARQ relay scheme. The closed-form expression clearly shows that the achieved diversity is partially due to the DF cooperative relaying and partially due to the fast fading nature of...

• Type: Journal
• Year: 2010
• Where: TWC
• Authors: Sangkook Lee, Weifeng Su, Stella N. Batalama, John D. Matyjas
• Keywords: Artificial Intelligence, Cooperative Arq, DF Cooperative, Power Allocation, TWC 2010