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This paper analyzes the efficiency of a jointdesign of an adaptive modulation and coding (AMC) at the
physical (PHY) layer with an adaptive Rmaxtruncated selectiverepeat automatic repeat request (ARQ)
protocol at the medium access control (MAC) layer to maximize the throughput of cooperative nonregenerative
relay networks under prescribed delay and/or error performance constraints. Particularly, we
generalize the existing design model/results for crosslayer combining of AMC along with truncated ARQ
in noncooperative diversity networks in threefolds: (i) extension of the crosslayer PHY/MAC design or
optimization to cooperative diversity systems; (ii) generalization/unification of analytical expressions for
various network performance metrics to generalized block fading channels with independent but nonidentically
distributed (i.n.d) fading statistics among the spatially distributed nodes; (iii) analysis of the
effectiveness of jointadaptation of the maximum retransmission limit Rmax of ARQ protocol and
cooperative diversity order N for delayinsensitive applications. Our insightful numerical results reveal
that the average throughput can be increased significantly by judiciously combining two additional degrees
of freedom (N and Rmax) that are available in cooperative amplifyandforward (CAF) relay networks
besides employing AMC at the PHY layer, especially in the most challenging low signaltonoise ratio
(SNR) regime.
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