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Spectrum sensing is an important building block to realize the cognitive radio concept. In order to combat fading in the wireless environment, cooperation among the sensing users is usually employed. In this paper, we develop a closed-form optimal local decision threshold for cooperative spectrum sensing in cognitive radio systems via large deviation analysis. The resultant strategy is independent...
Spectrum sensing is one of the most important tasks in cognitive radio system. In order to combat fading, cooperation among different sensing users is usually adopted. In our previous work [1], we quantified the performance gain of cooperative spectrum sensing by the notion of diversity. In addition, we have shown that even with local binary decisions, the cooperative spectrum sensing can achieve...
Spectrum sensing is a critical issue in cognitive radio networks. Cooperation among the secondary users is utilized to improve the performance of spectrum sensing. In this paper, we quantify the gain of cooperation in spectrum sensing by introducing the concept of diversity order. With different system performance metrics, we introduce different diversity quantities. We analyze the single-user sensing...
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