In this paper, an intelligent reflecting surface (IRS) is deployed to assist the terahertz (THz) communications. The sum-rate of user equipments (UEs) maximized while guaranteeing rate requirement each UE. A block coordinate searching (BCS) algorithm proposed jointly optimize IRS’s coordinates, phase shifts, THz sub-bands allocation and power control. Specifically, relaxation with penalt...

In this article, we consider covert beamforming design for intelligent reflecting surface (IRS)-assisted Internet-of-Things (IoT) networks, where Alice utilizes IRS to covertly transmit a message Bob without being recognized by Willie. We investigate the joint beamformer of and maximize rate when knowledge about Willie’s channel state information (WCSI) is perfect imperfect at Alice, res...

A new reflecting surface capable of simulating identical reflecting properties of a metallic plate with rectangular corrugations is reported. The new surface which is fabricated with a low loss dielectric plate of uniform thickness .One surface of the plate is periodically loaded with a grill structure of conducting wires and the other surface is completely metalized with copper. Depending on t...

Low-cost passive intelligent reflecting surfaces (IRSs) have recently been envisioned as a revolutionary technology capable of reconfiguring the wireless propagation environment through carefully tuning reflection elements. This paper proposes deploying an IRS to cover dead zone cellular multiuser full-duplex (FD) two-way communication links while suppressing user-side self-interference (SI) an...

In this letter, we propose a novel encrypted data transmission scheme using an intelligent reflecting surface (IRS) to generate secret keys in wireless communication networks. We show that perfectly secure one-time pad (OTP) communications can be established by simple random phase shifting of the IRS elements. To maximize rate, design optimal time slot allocation algorithm for key generation an...

In this paper, a novel relax-and-retract algorithm is proposed to tackle the nonconvex unit-modulus constraint in joint intelligent reflecting surface (IRS) and multiuser multiple-input multiple-output (MU-MIMO) transceiver design. The conventional method semidefinite relaxation (SDR), its computational complexity large. By using symbol detection mean square error (MSE) as quality of service (Q...

In this letter, we investigate an intelligent reflecting surface (IRS) aided device-to-device (D2D) offloading system, where IRS is employed to assist in computation from a group of users with intensive tasks another idle users. To minimize the system latency while cutting down heavy overhead exchange channel state information (CSI), study joint design beamforming and resource allocation on mix...

Pilot spoofing attack (PSA) is a kind of active eavesdropping, which launches the identical training sequence to manipulate channel estimation outcome during pilot phase. The newly proposed intelligent reflecting surface (IRS) system vulnerable PSA because it relies on pilot-assisted methods obtain statement information (CSI). To combat in IRS-assisted systems, we consider two significant chall...