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In this paper, we propose a new joint relay and jammer selection (JRJS) scheme to enhance the physical layer security for cooperative wireless networks with multiple intermediate nodes, where the decode-and-forward (DF) protocol is considered. In the proposed JRJS scheme, an ntermediate node is selected as the relay for data transmission, while the others are used to act as friendly jammers for disrupting...
We present a new accurate analysis for the downlink spectral efficiency of linear zero- forcing (ZF) beamforming over multi-user multiple- input multiple-output (MIMO) channels, experiencing composite fading effects in a multi- cell environment. In particular, Rayleigh/log- normal distribution (RLN) is proposed to model the composite fading channel. New exact expressions are derived for the downlink...
We propose a novel model for the NLOS interference power distribution in a cellular system employing MIMO beamforming transmission in mmWave spectrum. The proposed model is a mixture of the Inverse Gaussian and the Inverse Weibull distributions, both are two-parameter medium-to-heavy tail distributions. To estimate the parameters of the mixture model, we design an expectation maximization algorithm...
In this paper, we study wireless power transfer in a multiuser multiple-input single-output (MISO) system, where a base station equipped with N antennas wirelessly transfers power to distributed single-antenna users. To reduce the implementation cost, we propose a constant-envelope analog beamforming scheme to simultaneously transfer power to multiple users which requires only a single radio frequency...
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