Intelligent Reflecting Surfaces (IRSs) have recently emerged as a promising solution for realizing the smart radio environment concept by leveraging characteristics of metamaterials and large antenna arrays. However, existing works on IRS do not account transceiver impairments while analyzing performance assisted wireless systems. This paper investigates impact hardware imperfections IRS-assist...

This paper proposes a novel transmission policy for wireless powered sensor network (WPSN) assisted by an intelligent reflecting surface (IRS) to enhance the performance of energy transfer (WET) and information (WIT) with certain phase shifts. To achieve its self-sustainability, IRS collects from station support own control circuit operation. Our proposed considered WPSN is called harvest-then-...

This paper investigates a novel intelligent reflecting surface (IRS)-based symbiotic radio (SR) system architecture consisting of transmitter, an IRS, and information receiver (IR). The primary transmitter communicates with the IR at same time assists IRS in forwarding to IR. Based on IRS’s symbol period, we distinguish two scenarios, namely, commensal SR (CSR) parasitic (PSR), where different ...

In this paper, an indoor robot navigation system is investigated, where intelligent reflecting surface (IRS) employed to enhance the connectivity between access point (AP) and robotic users. Both single-user multiple-user scenarios are considered. scenario, one mobile user (MRU) communicates with AP. AP serves MRU static (SRU) employing either non-orthogonal multiple (NOMA) or orthogonal (OMA) ...

This work investigates the effect of double intelligent reflecting surface (IRS) in improving spectrum efficient multi-user multiple-input multiple-output (MIMO) network operating millimeter wave (mmWave) band. Specifically, we aim to solve a weighted sum rate maximization problem by jointly optimizing digital precoding at transmitter and analog phase shifters IRS, subject minimum achievable co...

Intelligent reflecting surface (IRS) is an emerging technology for future wireless communications including 5G and especially 6G. It consists of a large 2D array (semi-)passive scattering elements that control the electromagnetic properties radio-frequency waves so reflected signals add coherently at intended receiver or destructively to reduce co-channel interference. The promised gains IRS-as...

In this letter, the achievable rate maximization problem is considered for intelligent reflecting surface (IRS) assisted multiple-input multiple-output (MIMO) systems in an underlay spectrum sharing scenario, subject to interference power constraints at primary users. The formulated non-convex optimization challenging solve due its non-convexity as well coupling design variables constraints. Di...