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In this paper, an aggregator-assisted model for machine-to-machine (M2M) communications is proposed. The data aggregator plays the role of a third party that transmits aggregated M2M data to a cognitive operator, which does not own the radio spectrum but rather leases it from a spectrum owner. In the studied system, the cognitive operators for machine services are considered to dynamically appear...
For energy harvesting cognitive radio (EHCR), secondary user's (SU's) energy harvesting duration and spectrum sensing parameters jointly impact SU's capacity but have not been studied yet. In this paper, we investigate the joint impact. First, we obtain the closed-form expression of SU's capacity considering both limited energy supply and imperfect spectrum sensing. Then, we maximize SU's capacity...
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