Reconfigurable Holographic Surfaces for Future Wireless Communications

Deng, Ruoqi; Di, Boya; Zhang, Hongliang; Niyato, Dusit; Han, Zhu; Poor, H. Vincent; Song, Lingyang

doi:10.1109/mwc.001.2100204

Cited by 60 publications

(48 citation statements)

References 11 publications

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“…In the literature, there exists another type of antenna technique which is typically referred to as holographic MIMO [53]. In holographic MIMO, an infinite number of antenna elements are expected to be placed in a compact space, forming a continuous aperture [54], [55]. As a result, an extremely high spatial resolution can be achieved.…”

Section: A Basic Concept Of Rissmentioning

confidence: 99%

Intelligent Omni-Surfaces: Simultaneous Refraction and Reflection for Full-Dimensional Wireless Communications

Zhang

2022

IEEE Commun. Surv. Tutorials

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The development of metasurfaces has unlocked various use cases in wireless communication networks to improve performance by manipulating the propagation environment. Intelligent omni-surface (IOS), an innovative technique in this category, is proposed for coverage extension. In contrast to the widely studied reflective metasurfaces, i.e., intelligent reflecting surfaces (IRSs), which can only serve receivers located on the same side of the transmitter, the IOS can achieve full-dimensional wireless communications by enabling the simultaneous reflection and refraction of the surface, and thus users on both sides can be served. In this paper, we provide a comprehensive overview of the state-of-the-art in IOS from the perspective of wireless communications, with the emphasis on their design principles, channel modeling, beamforming design, experimental implementation and measurements, as well as possible applications in future cellular networks. We first describe the basic concepts of metasurfaces, and introduce the corresponding design principles for different types of metasurfaces. Moreover, we elaborate on the reflective-refractive model for each IOS element and the channel model for IOS-aided wireless communication systems. Furthermore, we show how to achieve full-dimensional wireless communications with the IOS for three different scenarios.In particular, we present the implementation of an IOS-aided wireless communication prototype and report its experimental measurement results. Finally, we outline some potential future directions and challenges in this area.

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Section: A Basic Concept Of Rissmentioning

confidence: 99%

Intelligent Omni-Surfaces: Simultaneous Refraction and Reflection for Full-Dimensional Wireless Communications

Zhang

2022

IEEE Commun. Surv. Tutorials

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“…In this paper, our aim is to optimize the sensing performance 4 given the constraints of communication qualities 5 . The sensing performance is promoted by minimizing the beampttern mismatch error, i.e., the difference between the transmit beampattern and a desired pattern, where the desired pattern has peaks in the target directions (as in [13]).…”

Section: Holographic Beamformer Optimizationmentioning

confidence: 99%

“…According to the vision of holographic radio, the antenna array in wireless systems is composed of a tremendous number of inexpensive antenna elements with low power consumption, tiny size, and ultra-close element spacing. Thus, by exploiting the high spatial diversity provided by numerous elements, high directive gain can be achieved for ISAC with an acceptable power consumption [4].…”

Section: Introductionmentioning

confidence: 99%

Holographic Integrated Sensing and Communications: Principles, Technology, and Implementation

Zhang¹,

Zhang²,

Di³

et al. 2022

Preprint

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Integrated sensing and communication (ISAC) has attracted much attention as a promising approach to alleviate spectrum congestion. However, traditional ISAC systems rely on phased arrays to provide high spatial diversity, where enormous power-consuming components such as phase shifters are used, leading to the high power consumption of the system. In this article, we introduce holographic ISAC, a new paradigm to enable high spatial diversity with low power consumption by using reconfigurable holographic surfaces (RHSs), which is an innovative type of planar antenna with densely deployed metamaterial elements. We first introduce the hardware structure and working principle of the RHS and then propose a novel holographic beamforming scheme for ISAC. Moreover, we build an RHS-enabled hardware prototype for ISAC and evaluate the system performance in the built prototype. Simulation and experimental results verify the feasibility of holographic ISAC and reveal the great potential of the RHS for reducing power consumption. Furthermore, future research directions and key challenges related to holographic ISAC are discussed.

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“…Recently, metamaterial antennas have been developed as a promising solution to lift the half-wavelength restrictions [19]. Due to the unique structure of the radiation elements in the metamaterial antenna, the size of the radiation elements and the spacing between nearby radiation elements can be much smaller than half of the wavelength, leading to superior beam-steering capabilities [20], [21]. One typical metamaterial antenna that enables ultra-thin and integrated transmitter/receiver design is the reconfigurable holographic surface (RHS) 1 .…”

Section: Introductionmentioning

confidence: 99%

Holographic Integrated Sensing and Communication

Zhang

et al. 2022

IEEE J. Select. Areas Commun.

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To overcome spectrum congestion, a promising approach is to integrate sensing and communication (ISAC) functions in one hardware platform. Recently, metamaterial antennas, whose tunable radiation elements are arranged more densely than those of traditional multiple-input-multiple-output (MIMO) arrays, have been developed to enhance the sensing and communication performance by offering a finer controllability of the antenna beampattern. In this paper, we propose a holographic beamforming scheme, which is enabled by metamaterial antennas with tunable radiated amplitudes, that jointly performs sensing and communication. However, it is challenging to design the beamformer for ISAC functions by taking into account the unique amplitude-controlled structure of holographic beamforming. To address this challenge, we formulate an integrated sensing and communication problem to optimize the beamformer, and design a holographic beamforming optimization algorithm to efficiently solve the formulated problem. A lower bound for the maximum beampattern gain is provided through theoretical analysis, which reveals the potential performance enhancement gain that is obtained by densely deploying several elements in a metamaterial antenna. Simulation results substantiate the theoretical analysis and show that the maximum beamforming gain of a metamaterial antenna that utilizes the proposed holographic beamforming scheme can be increased by at least 50% compared with that of a traditional MIMO array of the same size. In addition, the cost of the proposed scheme is lower than that of a traditional MIMO scheme while providing the same ISAC performance.

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Reconfigurable Holographic Surfaces for Future Wireless Communications

Cited by 60 publications

References 11 publications

Intelligent Omni-Surfaces: Simultaneous Refraction and Reflection for Full-Dimensional Wireless Communications

Intelligent Omni-Surfaces: Simultaneous Refraction and Reflection for Full-Dimensional Wireless Communications

Holographic Integrated Sensing and Communications: Principles, Technology, and Implementation

Holographic Integrated Sensing and Communication

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