Convex Optimization
TCP Dynamics and Adaptive MAC Retry-Limit Aware Link-Layer Adaptation over IEEE 802.11 WLAN
CNSR '09 Proceedings of the 2009 Seventh Annual Communication Networks and Services Research Conference
Capacity and power allocation for spectrum-sharing communications in fading channels
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Adaptive modulation in spectrum-sharing systems with delay constraints
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Cross-Layer combining of adaptive Modulation and coding with truncated ARQ over wireless links
IEEE Transactions on Wireless Communications
Competitive spectrum sharing in cognitive radio networks: a dynamic game approach
IEEE Transactions on Wireless Communications
IEEE Transactions on Multimedia
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Approaches to spectrum sharing
IEEE Communications Magazine
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We consider a dynamic spectrum sharing system consisting of a primary user, whose licensed spectrum is allowed to be accessed by a secondary user as long as it does not violate the prescribed interference limit inflicted on the primary user. Assuming the Nakagami-m block-fading environment, we aim at maximizing the performance of secondary user's link in terms of average spectral efficiency (ASE) and error performance under the specified packet error rate (PER) and average interference limit constraints. To this end, we employ a cross-layer design policy which combines adaptive power and coded discrete M-QAM modulation scheme at the physical layer with a truncated automatic repeat request (ARQ) protocol at the data link layer, and simultaneously satisfies the aforementioned constraints. Numerical results affirm that the secondary link of spectrum sharing system combining ARQwith adaptive modulation and coding (AMC) achieves significant gain in ASE depending on the maximum number of retransmissions initiated by the ARQ protocol. The results further indicate that the ARQ protocol essentially improves the packet loss rate performance of the secondary link.