Sensing and Reconfigurable Reflection of Electromagnetic Waves From a Metasurface With Sparse Sensing Elements

Alamzadeh, Idban; Imani, Mohammadreza F.

doi:10.1109/access.2022.3206831

Cited by 14 publications

(4 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Huygens-Fresnel principle states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. In [113] physicsbased end-to-end model of RIS-parametrized wireless channels with adjustable fading is presented. That was conceived from the first principles of coupled-dipole formalism.…”

Section: Operating Principle Of Rismentioning

confidence: 99%

Review Paper on Hardware of Reconfigurable Intelligent Surfaces

2023

View full text Add to dashboard Cite

Recently reconfigurable intelligent surface (RIS) has attracted great attention because it can create a smart wireless environment. Hence it can enhance the capacity and coverage of the wireless network significantly. A thorough review of RISs has been presented in this paper focusing on the hardware aspect of the RIS. Beyond-5G/6G communication will have a smart propagation environment, where RIS can be used for such communications. RIS consists of various small unit cells. The unit cells should have some tunning mechanism so that the incoming waves can be reflected or transmitted in the desired direction. It is possible to tune the impedance of the unit cells using PIN diodes, varactor didoes, microelectromechanical (MEMS), thermal, and other ways. In this paper, initially, the background of RIS has been discussed where RIS is going to play a significant role in beyond-5G/6G communications. We have also added the theoretical background of RIS and motivations to writing this paper. After that several published papers in the literature have been presented so that the readers can get an overall idea about the RIS and its hardware. Hence, this paper will be very useful for practitioner engineers and researchers. RISs have been presented in various tables and various parameters have been presented. We have discussed challenges and solutions for the hardware of the RIS design. We have also discussed potential research and research gap that can be explored in the future. Lastly, we have added a conclusion for this review paper.INDEX TERMS Reconfigurable intelligent surface (RIS), beyond-5G/6G communication, reflectarray, PIN diode, varactor diode.

show abstract

Section: Operating Principle Of Rismentioning

confidence: 99%

Review Paper on Hardware of Reconfigurable Intelligent Surfaces

2023

View full text Add to dashboard Cite

show abstract

“…In a conventional RIS design, the phase of the reflection coefficient of each element is controlled in order to enable modification of the propagated waves [13]. More recently, RIS designs have been proposed that enable control of both the phase and the attenuation of each element, providing additional degrees of freedom for shaping the resulting wave field [18], [21]. RIS technology has been proposed for many different types of wireless communication scenarios, including NOMA [8], [13].…”

Section: Overview Of Noma and Rismentioning

confidence: 99%

RIS-Assisted Interference Mitigation for Uplink NOMA

Tabeshnezhad¹,

Swindlehurst²,

Svensson³

2023

Preprint

View full text Add to dashboard Cite

Non-orthogonal multiple access (NOMA) has become a promising technology for next-generation wireless communications systems due to its capability to provide access for multiple users on the same resource. In this paper, we consider an uplink power-domain NOMA system aided by a reconfigurable intelligent surface (RIS) in the presence of a jammer that aims to maximize its interference on the base station (BS) uplink receiver. We consider two kinds of RISs, a regular RIS whose elements can only change the phase of the incoming wave, and an RIS whose elements can also attenuate the incoming wave. Our aim is to minimize the total power transmitted by the user terminals under quality-of-service constraints by controlling both the propagation from the users and the jammer to the BS with help of the RIS. The resulting objective function and constraints are both non-linear and non-convex, so we address this problem using numerical optimization. Our numerical results show that the RIS can help to dramatically reduce the per user required transmit power in an interference-limited scenario.

show abstract

“…The technique of reducing the number of required sensors was also demonstrated in that paper by using the tunable multiplexing capabilities of the metasurface. In [30], the authors proposed a metasurface made of two types of elements, conventional and hybrid. The hybrid element was designed to pass some of the incident signals into the sensing layer.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Unit Cells of a Reconfigurable Intelligence Surface Integrated with Sensing Capability at the mmWave Frequency Band

Rana,

Cho,

Hong

2024

Electronics

View full text Add to dashboard Cite

Integrated sensing and communication (ISAC) is emerging as a main feature for 5G/6G communications. To enhance spectral and energy efficiencies in wireless environments, reconfigurable intelligent surfaces (RISs) will play a significant role in beyond-5G/6G communications. Multi-functional RISs, capable of not only reflecting or transmitting the beam in desired directions but also sensing the signal, wirelessly transferring power to nearby devices, harvesting energy, etc., will be highly beneficial for beyond-5G/6G applications. In this paper, we propose a nearly 2-bit unit cell of RISs integrated with sensing capabilities in the millimeter wave (mmWave) frequency band. To collect a very small fraction of the impinging signals through vias, we employed substrate integrated waveguide (SIW) technology at the bottom of the unit cell and a via. This enabled the sensing of incoming signals, requiring only a small amount of the impinging signal to be collected through SIW. Initially, we utilized Floquet ports and boundary conditions to obtain various parameters of the unit cells. Subsequently, we examined 1 × 3-unit cells, placing them on the waveguide model to obtain the required parameters of the unit cell. By using the waveguide and 1 × 3-unit cell arrays, the sensing amount was also determined.

show abstract

Sensing and Reconfigurable Reflection of Electromagnetic Waves From a Metasurface With Sparse Sensing Elements

Cited by 14 publications

References 79 publications

Review Paper on Hardware of Reconfigurable Intelligent Surfaces

Review Paper on Hardware of Reconfigurable Intelligent Surfaces

RIS-Assisted Interference Mitigation for Uplink NOMA

Characterization of Unit Cells of a Reconfigurable Intelligence Surface Integrated with Sensing Capability at the mmWave Frequency Band

Contact Info

Product

Resources

About