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We study secrecy communication for a multi-pair decode-and-forward (DF) relay network (MP-DFRN), where one of the singe-antenna sources is wiretapped by a single-antenna eavesdropper. In particular, we aim to maximize the secrecy rate of the secure source while guaranteeing the quality of service (QoS) at the destinations with a total power constraint. The optimization requires a joint beamforming...
We address a robust beamforming design and power allocation problem for a multi-pair one-way relay network, where the single-antenna users of each pair implement communication via a decode-and-forward multi-antenna relay. In this network, a secure user and other unclassified users coexist with a multi-antenna eavesdropper, and only the imperfect eavesdropper's channel state information (ECSI) is available...
With the ever-increasing demand for data traffic, high dense cellular networks are gaining extensive attention. But at the same time dense deployment of small cells results in high energy consumption and operating cost. Sleep mode for high dense cellular networks is emerging as a promising way to meet green communication. The aim of this paper is to use the two-stage strategy for reducing the energy...
In this paper, we pioneer the study of physical-layer security in heterogeneous networks (HetNets). We investigate secure communications in a two-tier downlink HetNet, which comprises one macrocell and several femtocells. Each cell has multiple users and an eavesdropper attempts to wiretap the intended macrocell user. First, we consider an orthogonal spectrum allocation strategy to eliminate co-channel...
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