Intelligent reflecting surface (IRS) is envisioned to change the paradigm of wireless communications from “adapting channels” “changing channels”. However, current IRS configuration schemes, consisting sub-channel estimation and passive beamforming in sequence, conform conventional model-based design philosophies are difficult be realized practically complex radio environment. To create smart e...

Intelligent reflecting surface (IRS) has recently been emerged as an effective way for improving the performance of wireless networks by reconfiguring propagation environment through a large number passive elements. This game-changing technology is especially important stepping into Internet Everything (IoE) era, where high demanded with very limited available resources. In this paper, we study...

As communication systems that employ millimeter wave (mmWave) frequency bands must use large antenna arrays to overcome the severe propagation loss of mmWave signals, hybrid beamforming has been considered as an integral component communications. Recently, intelligent reflecting surface (IRS) proposed innovative technology can significantly improve performance through low-cost passive elements....

In this letter, an intelligent reflecting surface (IRS)-aided secure wireless information and power transfer system is studied. To maximize the harvested of energy harvesting receiver (EHR), we optimize transmit beamforming at access point (AP) phase shifts IRS subject to secrecy rate (SR) constraints. Due non-convexity optimization problem coupled variables, convert into a semidefinite relaxat...

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...