The adoption of a Reconfigurable Intelligent Surface (RIS) for downlink multi-user communication from multi-antenna base station is investigated in this paper. We develop energy-efficient designs both the transmit power allocation and phase shifts surface reflecting elements, subject to individual link budget guarantees mobile users. This leads non-convex design optimization problems which tackle we propose two computationally affordable approaches, capitalizing on alternating maximization,...

Future wireless networks are expected to constitute a distributed intelligent communications, sensing, and computing platform, which will have the challenging requirement of interconnecting physical digital worlds in seamless sustainable manner. Currently, two main factors prevent network operators from building such networks: (1) lack control environment, whose impact on radio waves cannot be customized, (2) current operation radios, consume lot power because new signals generated whenever...

Future wireless networks are expected to evolve towards an intelligent and software reconfigurable paradigm enabling ubiquitous communications between humans mobile devices. They will be also capable of sensing, controlling, optimizing the environment fulfill visions low-power, high-throughput, massively-connected, low-latency communications. A key conceptual enabler that is recently gaining increasing popularity Holographic Multiple Input Output Surface (HMIMOS) refers a low-cost...

Reconfigurable Intelligent Surfaces (RISs) have been recently considered as an energy-efficient solution for future wireless networks due to their fast and low-power configuration, which has increased potential in enabling massive connectivity low-latency communications. Accurate low-overhead channel estimation RIS-based systems is one of the most critical challenges usually large number RIS unit elements distinctive hardware constraints. In this paper, we focus on uplink a RIS-empowered...

We consider a multi-user Multiple-Input Single-Output (MISO) communication system comprising of multiantenna base station communicating in the downlink simultaneously with multiple single-antenna mobile users. This is assumed to be assisted by Large Intelligent Surface (LIS) that consists many nearly passive antenna elements, whose parameters can tuned according desired objectives. The latest design advances on these surfaces suggest cheap elements effectively acting as low resolution (even...

Wireless communication in the TeraHertz band (0.1--10 THz) is envisioned as one of key enabling technologies for future sixth generation (6G) wireless systems scaled up beyond massive multiple input output (Massive-MIMO) technology. However, very high propagation attenuations and molecular absorptions THz frequencies often limit signal transmission distance coverage range. Benefited from recent breakthrough on reconfigurable intelligent surfaces (RIS) realizing smart radio environment, we...

Reconfigurable Intelligent Surfaces (RISs) comprised of tunable unit elements have been recently considered in indoor communication environments for focusing signal reflections to intended user locations. However, the current proofs concept require complex operations RIS configuration, which are mainly realized via wired control connections. In this paper, we present a deep learning method efficient online wireless configuration RISs when deployed environments. According proposed method,...

Next generation wireless base stations and access points will transmit receive using an extremely massive numbers of antennas. A promising technology for realizing such arrays in a dynamically controllable scalable manner with reduced cost power consumption utilizes surfaces radiating metamaterial elements, known as metasurfaces. To date, metasurfaces are mainly considered the context communications passive reflecting devices, aiding conventional transceivers shaping propagation environment....

Intelligent surfaces comprising of cost effective, nearly passive, and reconfigurable unit elements are lately gaining increasing interest due to their potential in enabling fully programmable wireless environments. They envisioned offer environmental intelligence for diverse communication objectives, when coated on various objects the deployment area interest. To achieve this overarching goal, channels where Reconfigurable Surfaces (RISs) involved need be principle estimated. However, is a...

The demanding objectives for the future sixth generation (6G) of wireless communication networks have spurred recent research efforts on novel materials and radio-frequency front-end architectures connectivity, as well revolutionary computing paradigms. Among pioneering candidate technologies 6G belong reconfigurable intelligent surfaces (RISs), which are artificial planar structures with integrated electronic circuits that can be programmed to manipulate incoming electromagnetic field in a...

Various visions of the forthcoming sixth generation (6G) networks point toward flexible connect-and-compute technologies to support future innovative services and corresponding use cases. 6G should be able accommodate ever evolving heterogeneous applications, regulations, diverse user-, service-, location-based requirements. A key element building smart energy sustainable wireless systems beyond 5G is reconfigurable intelligent surface (RIS), which offers programmable control shaping...

Recent research on reconfigurable intelligent surfaces (RISs) suggests that RISs can perform passive beamforming and information transfer (PBIT) simultaneously via smart reflections. In this paper, we propose an RIS-enhanced multiple-input single-output system with reflection pattern modulation (RPM) to achieve PBIT, where the joint active is carefully designed by taking into account communication outage probability. We formulate optimization problem maximize average received signal power...

Reconfigurable intelligent surfaces (RISs) have recently emerged as an innovative technology for improving the coverage, throughput, and energy/spectrum efficiency of future wireless communications. In this paper, we propose a new transmission protocol wideband RIS-assisted single-input multiple-output (SIMO) orthogonal frequency division multiplexing (OFDM) communication systems, where each frame is divided into multiple sub-frames to execute channel estimation simultaneously with passive...

Recent advances in the fabrication and experimentation of Reconfigurable Intelligent Surfaces (RISs) have motivated concept smart radio environment, according to which propagation information-bearing waveforms wireless medium is amenable programmability. Although vast majority recent experimental research on RIS-empowered communications gravitates around narrowband beamforming quasi-free space, RISs are foreseen revolutionize wideband connectivity dense urban as well indoor scenarios,...

The design of 6th Generation (6G) wireless networks points towards flexible connect-and-compute technologies capable to support innovative services and use cases. Targeting the 2030 horizon, 6G are poised pave way for sustainable human-centered smart societies vertical industries, such that will be transformed into a distributed connectivity infrastructure, where new terminal types embedded in daily environment. In this context, RISE-6G project aims at investigating solutions capitalize on...

Exploiting wavefront curvature enables localization with limited infrastructure and hardware complexity. With the introduction of reconfigurable intelligent surfaces (RISs), new opportunities arise, in particular when RIS is functioning as a lens receiver. We investigate transmitter using RIS-based close proximity to single receive antenna element attached reception radio frequency chain. perform Fisher information analysis, evaluate impact different configurations, propose two-stage...

The multi-user Holographic Multiple-Input and Multiple-Output Surface (MU-HMIMOS) paradigm, which is capable of realizing large continuous apertures with minimal power consumption, has been recently considered as an energyefficient solution for future wireless networks, offering increased flexibility in impacting electromagnetic (EM) wave propagation according to the desired communication, localization, sensing objectives. tractable channel modeling MU-HMIMOS systems one most critical...

Reconfigurable intelligent surfaces (RISs) have been recently considered as a promising candidate for energy-efficient solutions in future wireless networks. Their dynamic and low-power configuration enables coverage extension, massive connectivity, low-latency communications. Due to large number of unknown variables referring the RIS unit elements transmitted signals, channel estimation signal recovery RIS-based systems are ones most critical technical challenges. To address this problem,...

Extracting roads from high-resolution remote sensing images (HRSIs) is vital in a wide variety of applications, such as autonomous driving, path planning, and road navigation. Due to the long thin shape well shades induced by vegetation buildings, small-sized are more difficult discern. In order improve reliability accuracy extraction when multiple sizes coexist an HRSI, enhanced deep neural network model termed Dual-Decoder-U-Net (DDU-Net) proposed this paper. Motivated U-Net model, small...

A revolutionary technology relying on Stacked Intelligent Metasurfaces (SIM) is capable of carrying out advanced signal processing directly in the native electromagnetic (EM) wave regime. An SIM fabricated by a sophisticated amalgam multiple stacked metasurface layers, which may outperform its single-layer counterparts, such as reconfigurable intelligent surfaces (RIS) and lenses. We harness this new for implementing holographic multiple-input multiple-output (HMIMO) communications without...

Future wireless systems are envisioned to create an endogenously holography-capable, intelligent, and programmable radio propagation environment, that will offer unprecedented capabilities for high spectral energy efficiency, low latency, massive connectivity. A potential promising technology supporting the expected extreme requirements of sixth-generation (6G) communication is concept holographic multiple-input multiple-output (HMIMO), which actualize radios with reasonable power...

The use of in-band full-duplex (FD) enables nodes to simultaneously transmit and receive on the same frequency band, which challenges traditional assumption in wireless network design. capability enhances spectral efficiency decreases latency, are two key drivers pushing performance expectations next-generation mobile networks. In less than ten years, FD has advanced from being demonstrated research labs implemented standards, presenting new opportunities utilize its foundational concepts....

The latest discussions on upcoming 6G wireless communications are envisioning future networks as a unified communications, sensing, and computing platform. recently conceived concept of the smart radio environment, enabled by reconfigurable intelligent surfaces (RISs), contributes toward this vision, offering programmable propagation information-bearing signals. Typical RIS implementations include metasurfaces with almost passive unit elements capable reflecting their incident waves in...

Integrated sensing and communications (ISAC) are envisioned to be an integral part of future wireless networks, especially when operating at the millimeter-wave (mm-wave) terahertz (THz) frequency bands. However, establishing connections these high frequencies is quite challenging, mainly due penetrating path loss that prevents reliable communication sensing. Another emerging technology for next-generation systems reconfigurable intelligent surface (RIS), which refers hardware-efficient...