Convex Optimization
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Spectrum sensing measurements of pilot, energy, and collaborative detection
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Adaptive rate and power transmission in spectrum-sharing systems
IEEE Transactions on Wireless Communications
Capacity of fading channels with channel side information
IEEE Transactions on Information Theory
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Effective capacity for interference and delay constrained cognitive radio relay channels
IEEE Transactions on Wireless Communications
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We propose rate and power adaptation strategies to optimize data transmission over fading channels in a spectrum sharing system operating under average received-interference constraint at the licensed user (primary user). Specifically, considering availability of the channel state information (CSI) pertaining to the secondary link and spectrum-sensing information about the activity state of the primary user, we investigate two adaptation policies at the secondary user's transmitter, namely, variable power and variable rate and power, over Rayleigh fading channels. The adaptation policies are obtained by maximizing the achievable capacity under said constraint and bit error rate (BER) requirements in multilevel quadrature amplitude modulation (M-QAM). We asses the benefits of using soft-sensing information about the primary user's activity on rate and power adaptation in spectrum sharing systems, and provide numerical results and comparisons illustrating performance for different operating scenarios.