The spectrum scarcity and the corresponding efficient spectrum utilization are one of the major challenges in wireless communications today. Cognitive radios are the devices that will enable spectrum availability detection and efficient opportunistic spectrum sharing. This paper addresses the problems of joint power and channel allocation in a spectrum sharing scenario for WiFi-like secondary users in TV white spaces. Due to the high complexity in obtaining optimal power/channel allocation strategies, the paper proposes a suboptimal algorithm that combines the power/channel allocation methods using Nash Bargaining Solution (NBS) game theoretic approach, while still achieving fair spectrum utilization. In the given scenario the sharing algorithm maximizes the number of supported secondary users while jointly optimizing the power and channel allocation. Numerical results show that the introduction of combined power/channel allocation method for efficient spectrum sharing among secondary users enhances the efficient available spectrum use.

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