Optimizing a Secure Two-Way Network with Non-Linear SWIPT, Channel Uncertainty, and a Hidden Eavesdropper

Abstract

In this paper, the optimization of downlink beamforming vectors, uplink transmission power, and power-splitting factors is investigated for a secure two-way SWIPT network in the presence of a hidden eavesdropper and non-linear energy harvesting circuits over both perfect and imperfect channels. The eavesdropper is inactive, so its channel information is not available at the base stations (BSs). The purpose of artificial noise is to create downlink interference with the hidden eavesdropper as much as possible, while satisfying the quality of service for two-way communications. For perfect downlink channels, the semidefinite relaxation (SDR) technique is exploited, and the optimal matrices are proven to satisfy rank-1 conditions, thus providing the optimal beamforming vectors. For imperfect downlink channel state information, we propose an iterative algorithm with a penalty function to obtain the approximate rank-1 matrices. On uplink, we attain the optimal transmission power for users receiving maximum ratio transmission beamforming at the BSs. Eventually, the numerical experiments show the superiority of the proposed scheme, compared to a conventional scheme, in terms of signal-to-interference-plus-noise ratio at the eavesdropper.

A Secure-Transmission Maximization Scheme for SWIPT Systems Assisted by an Intelligent Reflecting Surface and Deep Learning

“…So, problem ( 24) is still non-convex. Therefore, we use the penalty method to solve the rank-1 problem, as mentioned in [48], [49]. We know that all eigenvalues of Q are non-negative, since Q is a PSD matrix.…”

“…Regarding non-convex function (−λ max (Q)), we observe that λ max (•) is a convex function [49]. Therefore, we can approximate the λ max (•) function in an iterative manner.…”

Performance Analysis of Multihop Full-Duplex NOMA Systems with Imperfect Interference Cancellation and Near-Field Path-Loss

“…The performance of multihop communications was studied extensively in [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. Alnawafa and other authors in [ 34 ] proposed a novel routing algorithm that dramatically improves the lifespan, stability, and throughput of the networks compared with the state-of-the-art.…”

“…However, they simply considered multihop networks not combining with other advanced techniques such as NOMA and/or full-duplex relaying. Authors in [ 37 ] also investigated the secrecy performance of nonlinear SWIPT systems. They, nonetheless, focus on minimizing the total transmission in downlink and uplink power consumption instead of deriving the OP and system throughput.…”

Performance Evaluation of Short-Packet Communications of Single-Hop System with Presence of Co-Channel Interference

“…• The simulation results are executed to validate the exact of our theory analysis. This simulation method is used effectively and widely in many studies [13]- [19] A. Organization In Section II, a description of the system model is presented.…”