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The authors developed a new resource allocation optimization framework for a single-cell multiuser multicarrier cognitive radio network in the presence of multiple primary networks. The framework aims to minimize the spectral footprint of the CRN through the bandwidth-power product metric. The protection of PU from harmful interference is incorporated in the framework through PU activity index. In addition, several hardware limitations of CR users are considered in the proposed framework. Based on the performance evaluation results presented in this paper, the proposed framework improves the utilization of spectrum by striking an optimum balance between the consumed power and bandwidth.
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