This letter proposes a deep reinforcement learning (DRL) based relay selection scheme for cooperative networks with the intelligent reflecting surface (IRS). We consider practical phase-dependent amplitude model in which IRS reflection amplitudes vary discrete phase-shifts. Furthermore, we apply to reduce signal loss over distance IRS-assisted networks. To solve complicated problem of joint and...

In this paper, we investigate covert communication in an intelligent reflecting surface (IRS)-assisted non-orthogonal multiple access (NOMA) system, where a legitimate transmitter (Alice) applies NOMA for downlink and uplink transmissions with user (Bob) public (Roy) aided by IRS. Specifically, propose new IRS-assisted schemes to hide the existence of Bob’s transmission from warden (Willie), wh...

Pilot spoofing attack brings new challenges to physical layer secure transmission. However, this method will not work without any knowledge about the pilot sequence and active eavesdropping can be detected by constructing random sequence. Intelligent reflecting surface (IRS), with real-time programmable features for wireless channels, provides possibilities effective spoofing. In paper, IRS is ...

Terahertz (THz) and intelligent reflecting surface (IRS) have been regarded as two promising technologies to improve the capacity coverage for future 6G networks. Generally, IRS is usually equipped with large-scale elements when implemented at THz frequency. In this case, near-field model beam squint should be considered. Therefore, in paper, we investigate far-field problems communications fir...

Intelligent reflecting surface (IRS) is a promising technology to reconfigure wireless channels, which brings new degree of freedom for the design future networks. This article proposes three-dimensional (3D) system architecture enabled by aerial IRS (AIRS). Compared conventional terrestrial IRS, AIRS enjoys more deployment flexibility as well wider-view signal reflection, thanks its high altit...

Unmanned aerial vehicles (UAVs) are envisioned to be extensively employed for assisting wireless communications in the Internet of Things (IoT). On other hand, terahertz (THz)-enabled intelligent reflecting surface (IRS) is expected one core enabling technologies forthcoming beyond-5G (B5G) that promise a broad range data-demand applications. In this article, we propose UAV-mounted IRS (UIRS) c...

The intelligent reflecting surface (IRS) is considered a core technology of next-generation mobile communication. It has significant advantages in enhancing network coverage, spectrum efficiency, energy and deployment cost. Compared with the conventional massive multiple-input-multiple-output (MIMO) system, cell-free MIMO overcomes limitation imposed by inter-cell interference traditional cellu...

This paper proposes an intelligent reflective surface (IRS) design scheme to improve the spectral efficiency (SE) for downlink multi-user (MU) multiple-input-single-output (MISO) system. IRS composed of low-cost reflecting elements is expected be used in various scenarios future wireless communication systems. It can even when direct path blocked by obstacles. Since only adjust phase, matrix ca...