Joint beamforming and power allocation for secure communication in cognitive radio networks

Abstract

In this study, secure communication in cognitive radio networks is investigated. A cooperative jammer is utilised to transmit artificial noise for interfering with the eavesdropper. The authors' objective is to maximise the available secrecy rate of the secondary user (SU) under the interference power constraint at the primary user and the global transmit power constraint at the transmitters. In that case, beamforming vectors of the SU transmitter and the cooperative jammer, and power allocation between them need to be optimised. However, the optimisation problem is non-convex and hard to solve. In order to tackle it, two suboptimal algorithms are proposed: complete orthogonal projection and partial orthogonal projection. In these algorithms, the original optimisation problems are first decoupled into two sub-problems, which deal with the transmit beamforming vectors and power allocation, respectively. Then, the optimal solution is obtained by iteration alternately. Finally, simulation results verify the effectiveness of the proposed algorithms.

ELASTIC- Enabling Massive-Antenna for Joint Spectrum Sensing and Sharing: How Many Antennas Do We Need?

“…where ξ, β, and θ are respectively the shape, scale and location parameters of the GEV distribution and are given by: 26) and the mean, the variance and the skewness of X LE are given by Corollary 1.…”

“…In the context of massive antenna deployment (up to few hundred in the literature), it is very likely for CRs to exploit the advantages offered by the multiple-input multiple-output (MIMO) technologies to improve secondary communications [21]- [26]. For instance, massive antenna technology allows the secondary users exploiting the angle-of-arrival dimension in the transmission hyperspace using beamforming [27]- [30].…”

Optimal Power Allocation for a Relaying-Based Cognitive Radio Network in a Smart Grid

“…In the DAU receiver, by introducing the beamforming weights w d [46], the received signal at the DAU receiver is…”

Enhanced physical layer security for cognitive radio systems through joint spectrum access and power allocation

“…The proposed solutions reported in the literature can be mainly classified into different categories, such as (i) beamforming‐based [15–17], (ii) radio resource allocation‐based [17, 18], (iii) relay‐assisted transmission [18–20], (iv) transmit antenna selection [21–24], (v) jamming‐based [11, 16], and (vi) game theoretic‐based [25] techniques and algorithms. For instance, the authors in [17] have investigated the PHY security of joint beamforming and power allocation scheme in a CR network. A scheme for joint jammer selection and beamforming has been proposed in [16] for securing a multiple‐input multiple‐output (MIMO) cooperative CR network.…”