Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
A Genetic Algorithm for the Multidimensional Knapsack Problem
Journal of Heuristics
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
An empirically based path loss model for wireless channels in suburban environments
IEEE Journal on Selected Areas in Communications
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
IEEE Journal on Selected Areas in Communications
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Efficient resource allocation algorithm for cognitive OFDM systems
IEEE Communications Letters
IEEE Transactions on Wireless Communications
Resource allocation for multiuser cognitive OFDM networks with proportional rate constraints
International Journal of Communication Systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
International Journal of Network Management
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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The problem of subcarrier, bit and power allocation for an OFDM based cognitive radio system in which one or more spectrum holes exist between multiple primary user (PU) frequency bands is studied. The cognitive radio user is able to use any portion of the frequency band as long as it does not interfere unduly with the PUs' transmissions. We formulate the resource allocation as a multidimensional knapsack problem and propose a low-complexity, greedy max-min algorithm to solve it. The proposed algorithm is simple to implement and simulation results show that its performance is very close to (within 0.3% of) the optimal solution.