Cooperative Decode-and-Forward ARQ Relaying: Performance Analysis and Optimum 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 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).
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2010
- Accession Number
- ADA549372
Entities
People
- John D. Matyjas
- Sangkook Lee
- Stella N. Batalama
- Weifeng Su
Organizations
- University at Buffalo