An ARQ mechanism considering resource and traffic priorities in cognitive radio systems
IEEE Communications Letters
Distributed energy efficient spectrum access in cognitive radio wireless ad hoc networks
IEEE Transactions on Wireless Communications
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Journal of Network and Computer Applications
Initial spectrum access control with QoS protection for active users in cognitive wireless networks
International Journal of Communication Systems
Biological Swarm Intelligence Based Opportunistic Resource Allocation for Wireless Ad Hoc Networks
Wireless Personal Communications: An International Journal
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In this paper, we propose a cognitive radio based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given preexisting communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided to obtain information such as subcarrier availability, noise power and channel gain. Given this information, both frequency spectrum and power are allocated to emerging new users (i.e., cognitive radio users), based on a distributed multi-user resource allocation framework, in order to satisfy a target data rate and a power constraint of each cognitive radio user, while attempting to avoid interference to the existing communications as well as to minimize total power consumption of the cognitive radio users.