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...

Intelligent reflecting surface (IRS) enhanced multi-unmanned aerial vehicle (UAV) non-orthogonal multiple access (NOMA) networks are investigated. A new transmission framework is proposed, where UAV-mounted base stations employ NOMA to serve groups of ground users with the aid an IRS. The three-dimensional (3D) placement and transmit power UAVs, reflection matrix IRS, decoding orders among join...

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...

Reconfigurable intelligentsurface (RIS) has emerged as a cost- and energy-efficient solution to enhance the wireless communications capacity. However, recent studies show that very large surface is required for RIS-assisted system; otherwise, they may be outperformed by conventional relay. Furthermore, performance gain of RIS can considerably degraded hardware impairments such limited-resolutio...

In this letter, the use of intelligent reflecting surface (IRS) to enhance physical layer security downlink wireless communication is investigated. Assuming a single-antenna legitimate user and multi-antenna eavesdropper, we propose an effective algorithm jointly optimize active passive beamforming. proposed algorithm, optimal transmit beamforming vector at BS under fixed IRS phase shifts deriv...

This paper investigates a symbiotic unmanned aerial vehicle (UAV)-assisted intelligent reflecting surface (IRS) radio system, where the UAV is leveraged to help IRS reflect its own signals base station, and meanwhile enhance transmission by passive beamforming at IRS. First, we consider weighted sum bit error rate (BER) minimization problem among all IRSs jointly optimizing trajectory, phase sh...