Terahertz (THz) communications have emerged as a promising candidate to support the heavy data traffic and exploding network capacity in future 6G wireless networks. However, THz face many challenges for practical implementation, such propagation loss, signal blockage, hardware cost. In this article, an emerging paradigm of intelligent reflecting surface (IRS)-assisted is analyzed address above...

Free-space optical (FSO) systems are able to offer the high data-rate, secure, and cost-efficient communication links required for applications such as wireless front- backhauling 5G 6G networks. Despite substantial advancement of FSO over past decades, requirement a line-of-sight connection between transmitter receiver remains key limiting factor their deployment. In this article, we discuss p...

In this paper, an intelligent reflecting surface (IRS) assisted spectrum sharing underlay cognitive radio (CR) wiretap channel (WTC) is studied, and we aim at enhancing the secrecy rate of secondary user in subject to total power constraint transmitter (ST), interference (IPC) primary receiver (PR) as well unit modulus IRS. Due extra IPC eavesdropper (Eve) are considered, all existing solutions...

Intelligent reflecting surface (IRS) is an enabling technology to engineer the radio signal propagation in wireless networks. By smartly tuning reflection via a large number of low-cost passive elements, IRS capable dynamically altering channels enhance communication performance. It thus expected that new IRS-aided hybrid network comprising both active and components will be highly promising ac...

Future generation communication systems are aiming to provide a tremendous high data rate with low-latency reliable and three-dimensional coverage. To achieve such challenging goal, it is required have very precise location information related the mobile terminal. The advancement of signal processing techniques technologies enables path for improving localization performance. Recently, intellig...

Half-power beamwidth (HPBW) is a key parameter to measure the performance of antenna array and newly proposed intelligent reflecting surface (IRS) systems. In this letter, we first establish system model for IRS in uniform linear (ULA) rectangular (URA) configurations, then HPBW both cases are derived under far-field condition without considering channel path-loss fading. We find that ULA URA e...

This paper investigates the security enhancement of an intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) network, where a base station (BS) serves users securely with assistance distributed IRSs. Considering that eavesdropper’s instantaneous channel state information (CSI) is challenging to acquire in practice, we utilize secrecy outage probability (SOP) as met...