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Device-to-Device (D2D) communications have been proposed recently to improve the spectral efficiency. In this paper, we consider physical-layer security in D2D communication as an underlay to cellular networks with an eavesdropper. Benefiting from the underlaid spectrum reuse, D2D users can contribute to the system secrecy capacity, while D2D users may interfere the cellular users and decrease their...
With the rapid growth of sensor technology, smartphone sensing has become an effective approach to help improve the quality of applications in smartphones. However, the quality and quantity of the sensed data uploaded by the users are not always satisfying due to the lack of incentives for users to participate. In this paper, we design an incentive mechanism in which the users can get satisfying rewards...
Device-to-Device (D2D) communications underlying cellular networks have been regarded as a promising way to satisfy the growing requirement for data traffic. However, the D2D pairs may bring significant interference to cellular networks when they share the channel with the cellular user equipments (UEs). In this paper, we consider the scenario in which the D2D pairs share the uplink channel with the...
In this paper, we consider a cognitive relay network, in which multiple pairs of secondary users (SUs) share the unlicensed spectrum by the overlay mode, and for each SU pair, the two ends exchange data via a common relay node that senses the spectrum and allocates the unused bandwidth. Here, we formulate the spectrum allocation problem as a multi-object auction and introduce the mechanisms of sequential...
In this paper, we consider a cognitive radio network in which multiple pairs of secondary users (SUs) exchange their information over two-way relay orthogonal channels with the existence of an eavesdropper. The SU pairs share the same frequency band with a primary user (PU) by satisfying the interference power constraint, and the eavesdropper can listen to all the frequency bands. Our goal is to maximize...
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