In this paper, we study an intelligent reflecting surface (IRS)-aided wireless secure communication system for physical layer security, where IRS is deployed to adjust its elements guarantee of multiple legitimate users in the presence eavesdroppers. Aiming improve secrecy rate, a design problem jointly optimizing base station (BS)'s beamforming and IRS's formulated given different quality serv...

This letter considers an active intelligent reflecting surface (IRS)-aided wireless powered communication network (WPCN), where devices first harvest energy and then transmit information to a hybrid access point (HAP). Different from the existing works on passive IRS-aided WPCNs, this is work that introduces IRS in WPCNs. To guarantee fairness, problem formulated as amplifying power-limited wei...

This paper proposes an intelligent reflecting surface (IRS) backscatter based uplink coordinated transmission strategy for a radio cellular network, where IRS serves as transmitter enabling from each user to the associated base station (BS). To be specific, considered network is made up of multiple cells, which consists one multi-antenna BS and its served users. While power beacon (PB) deployed...

This letter investigates secure transmission in an intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) network. Consider a practical eavesdropping scenario with imperfect channel state information of the eavesdropper, we propose robust beamforming scheme using artificial noise to guarantee NOMA IRS. A joint transmit and IRS phase shift optimization problem is for...

This work examines the performance gain achieved by deploying an intelligent reflecting surface (IRS) in covert communications. To this end, we formulate joint design of transmit power and IRS reflection coefficients taking into account communication covertness for cases with global channel state information (CSI) without a warden’s instantaneous CSI. For case CSI, first prove that perfect is a...

In intelligent reflecting surface (IRS) aided wireless communication systems, channel state information (CSI) is crucial to achieve its promising passive beamforming gains. However, CSI errors are inevitable in practice and generally correlated over the IRS elements due limited training with discrete phase shifts, which degrade data transmission rate reliability. this paper, we focus on investi...

We propose and analyze secret key generation using intelligent reflecting surface (IRS) assisted wireless communication networks. To this end, we first formulate the minimum achievable capacity for an IRS acting as a passive beamformer in presence of multiple eavesdroppers. Next, develop optimization framework coefficients based on lower bound. derive tractable efficient solution, design semide...

Intelligent reflecting surface (IRS) is a promising technology for achieving spectrum and energy-efficient wireless networks cost-effectively. Most existing works on IRS have focused exploiting to enhance the performance of communication or information transmission (WIT), while its potential boosting efficiency radio frequency (RF) energy (WET) still remains largely open. Although IRS-aided WET...