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Cognitive radios have a great potential to improve spectrum utilization by enabling dynamic spectrum access. A key challenge in operating these radios is how to implement an efficient Medium Access Control (MAC) mechanism that adaptively and efficiently allocates transmission powers and spectrum according to the surrounding environment. In this paper, they propose a distributed MAC protocol for operating spectrum-agile radios in a multi-hop ad hoc network. Their protocol is unique in that it exploits the ''Dual-receive'' capability of radios, which is used to overcome channel access problems that are common to multi-channel designs. They conduct theoretical analysis of the protocol and study its performance via simulations.
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