Abstract
In this letter, a novel metric is proposed to evaluate the average sensing energy-efficiency of cognitive radio (CR) networks. A theorem as well as the related closed-form expression for determining the optimum number of cooperative sensing cognitive terminals is provided to optimize the proposed metric. According to the theorem, we propose an efficient terminal-assignment strategy for coordinated spectrum sensing. Simulation results show that the proposed strategy can significantly improve the overall average sensing energy efficiency of the CR system.
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