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Cognitive Radios (CRs) are emerging as a promising technology to enhance spectrum utilization through opportunistic on-demand access. Many spectrum access/sharing algorithms for CR Networks (CRNs) have been designed assuming multiple transceivers per CR user. However, in practice, such an assumption may not hold due to hardware cost. In this paper, the authors address the problem of assigning channels to CR transmissions, assuming one transceiver per CR. The primary goal of their design is to maximize the number of simultaneous CR transmissions with respect to both spectrum assignment and transmission power. Energy conservation is also treated, but as a secondary objective.
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