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Secondary spectrum access is a promising approach to improve spectrum utilization by enabling new wireless systems to opportunistically use and efficiently share the licensed bands. This paper targets a WiFi-like reuse of available spectrum in the TV bands and proposes a novel cooperative centralized spectrum sharing scheme that enables protection for the primary users and provides efficient usage of the available spectrum for multiple coexisting secondary users. The proposed scheme relies on a Non-Linear Integer Programming (NLIP) optimization method to maximize the average SIR per secondary user. Furthermore, the sharing scheme introduces interference protection zones for primary users' protection from excessive interference.
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