DTIC ADA549372: Cooperative Decode and Forward ARQ pdf

DTIC ADA549372: Cooperative Decode and Forward ARQ

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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 Alamouti-based retransmission signals in the cooperative ARQ scheme. In particular, (1) we derive a closed-form asymptotically tight (as SNR approaches infinity) approximation of the outage probability; (2) we show that the diversity order of the DF cooperative ARQ relay scheme is equal to 2L-1, where L 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 fast fading nature of the channels (temporal diversity

• Creator/s: Defense Technical Information Center
• Date: 8/1/2010
• Year: 2010
• Book Topics/Themes: DTIC Archive, , STATE UNIV OF NEW YORK AT BUFFALO DEPT OF ELECTRICAL ENGINEERING, *COMMUNICATIONS PROTOCOLS, *RADIO RELAY SYSTEMS, FADING(ELECTROMAGNETIC WAVES), PREDICTIONS, REPRINTS

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