Distributed Resource Allocation for Cognitive Radio Networks With Spectrum-Sharing Constraints

Date Added: Jul 2011
Format: PDF

This paper presents new design formulations that aim at optimizing the performance of an Orthogonal Frequency-Division Multiple-Access (OFDMA) ad hoc cognitive radio network through joint subcarrier assignment and power allocation. Aside from an important constraint on the tolerable interference induced to primary networks, to efficiently implement spectrum-sharing control within the unlicensed network, the optimization problems considered here strictly enforce upper and lower bounds on the total amount of temporarily available bandwidth that is granted to individual secondary users. These new requirements are of particular relevance in cognitive radio settings, where the spectral activities of primary users are highly dynamic, leaving little opportunity for secondary access.