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...

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...

Industry 5.0 envisions close cooperation between humans and machines requiring ultra-reliable low-latency communications (URLLC). The intelligent reflecting surface (IRS) has the potential to play a crucial role in realizing wireless URLLC for 5.0. IRS is forecast be key enabler of 6G communication networks as it can significantly improve network performance by creating controllable radio envir...

<span>Terahertz (THz)-band communications can be considered as the new frontline for future-generation wireless communication systems it has a wider bandwidth in comparison to microwave and mmwave communications. It also promises integrate wide range of diverse applications. Because high path loss narrow spreading THz waves, transmission is extremely sensitive signal coverage critical pro...

This work proposes linear time strategies to optimally configure the phase shifts for reflective elements of an intelligent reflecting surface (IRS). Specifically, we show that binary beamforming can be solved in maximize received signal-to-noise ratio (SNR). For general K-ary beamforming, develop a approximation algorithm guarantees performance within constant fraction (1+\cos(\pi/K))/2 global...