Near- and Far-Field Communications with Large Intelligent Surfaces

Torres, Andrea de Jesus; Sanguinetti, Luca; Björnson, Emil

doi:10.1109/ieeeconf51394.2020.9443437

Cited by 26 publications

(6 citation statements)

References 7 publications

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“…It was shown that ZF and MRT perform equally well when the umber of antennas reaches it's asymptotic limit, while MRT is sub-optimal for practical LIS sizes. Following [285], reference [230] showed that when the distance between UE and LIS is comparable to the size of LIS, the near-field assumption holds. Both MRC and MMSE combining schemes were considered to study the uplink spectrum efficiency of two UEs communicating with an LIS with varying antenna spacing, effective antenna areas and loss from polarization mismatch.…”

Section: Circuit Theory Model Linear Mmse Methodsmentioning

confidence: 99%

“…In [230], the authors assessed the uplink spectral efficiency of an LIS communicating with two single-antenna UEs, with an emphasis on the near-field communication. They validated the uplink spectral efficiency using MRC and minimum mean squared error (MMSE) combining schemes, and showed that MMSE combining is superior to MR combining in achieving high spectral efficiency by mitigating the interference.…”

Section: B Hmimo Performance Analysis 1) Dofmentioning

confidence: 99%

“…Examine received power by a circuital description of the system, and evaluate sumrate with respect to antenna spacing, ohmic losses, and inter-UE mutual coupling. [230] Uplink two UEs BS: LIS, UE: Single-antenna UPA LOS (Near-/far-field) Assess uplink spectral efficiency using MRC and MMSE combing schemes in the near-field region. Compare LOS holographic-input holographic-output system with conventional LOS MIMO systems in terms of capacity and power gain.…”

Section: B Hmimo Performance Analysis 1) Dofmentioning

confidence: 99%

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Holographic MIMO Communications: Theoretical Foundations, Enabling Technologies, and Future Directions

Gong¹,

Gavriilidis²,

Ji³

et al. 2023

Preprint

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<p>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 and energy efficiency, low latency, and massive connectivity. A potential and promising technology for supporting the expected extreme requirements of the sixth-generation (6G) communication systems is the concept of the holographic multiple-input multiple-output (HMIMO), which will actualize holographic radios with reasonable power consumption and fabrication cost. The HMIMO is facilitated by ultra-thin, extremely large, and nearly continuous surfaces that incorporate reconfigurable and sub-wavelength-spaced antennas and/or metamaterials. Such surfaces comprising dense electromagnetic (EM) excited elements are capable of recording and manipulating impinging fields with utmost flexibility and precision, as well as with reduced cost and power consumption, thereby shaping arbitrary-intended EM waves with high energy efficiency. The powerful EM processing capability of HMIMO opens up the possibility of wireless communications of holographic imaging level, paving the way for signal processing techniques realized in the EM-domain, possibly in conjunction with their digital-domain counterparts. However, in spite of the significant potential, the studies on HMIMO communications are still at an initial stage, its fundamental limits remain to be unveiled, and a certain number of critical technical challenges need to be addressed. In this survey, we present a comprehensive overview of the latest advances in the HMIMO communications paradigm, with a special focus on their physical aspects, their theoretical foundations, as well as the enabling technologies for HMIMO systems. We also compare the HMIMO with existing multi-antenna technologies, especially the massive MIMO, present various promising synergies of HMIMO with current and future candidate technologies, and provide an extensive list of research challenges and open directions for future HMIMO-empowered wireless applications.</p>

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Section: Circuit Theory Model Linear Mmse Methodsmentioning

confidence: 99%

Section: B Hmimo Performance Analysis 1) Dofmentioning

confidence: 99%

Section: B Hmimo Performance Analysis 1) Dofmentioning

confidence: 99%

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Holographic MIMO Communications: Theoretical Foundations, Enabling Technologies, and Future Directions

Gong¹,

Gavriilidis²,

Ji³

et al. 2023

Preprint

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show abstract

“…This property is exploited by the authors in [10], to facilitate multi-user downlink multipleinput multiple-output systems, while exploring various antenna architectures. Near-field communications are also investigated in [11], where the authors consider a large intelligent surface and study the uplink spectral efficiency achieved by two singleantenna users. The authors in [7], propose a phase-delay focusing in order to mitigate the near-field beam-split effect, which occurs from the extremely large bandwidth and array aperture.…”

Section: Introductionmentioning

confidence: 99%

Energy Focusing for Wireless Power Transfer in the Near-Field Region

Demarchou

Psomas

Krikidis

2022

GLOBECOM 2022 - 2022 IEEE Global Communications Conference

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The future sixth generation (6G) wireless communications are envisioned to bring forth the era of the Internet of Everything (IoE). This work investigates wireless power transfer (WPT) in the radiating near-field region, as a medium for charging the low-powered IoE devices. Specifically, we exploit the near-field channel model in order to create power beamfocusing at a predefined focal point. We consider a uniform planar array employing beamfocusing, and provide analytical expressions for the harvested power at the receiver located at (i) a fixed and (ii) a random location in the network. We present numerical results which validate our analysis and draw an insight overview for the near-field WPT under various design parameters while demonstrating the gains brought against far-field WPT.

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“…• Patch antenna with a particular size: One wellinvestigated antenna type is the patch antenna with a certain size [49], [53], [92]- [95]. Thousands of square patch antennas are incorporated to construct a plane and each element size is A × A with A being the side length of each patch antenna element.…”

Section: B Uniform Planar Array (Upa)-based Xl-mimomentioning

confidence: 99%

Very large scale integration architectures of discrete transforms for digital signal processing applications

Wang¹

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Luo Jianwen, Associate Professor Jong Ching Chuen, and Associate Professor Chang Chip Hong, for their friendship, help, discussions, suggestions and encouragement.I do also appreciate the support and help from my colleagues in the FTD Solutions Pte Ltd and in the Centre for Signal Processing, NTD. Especially, I would like to thank Qian Yue, Lu Dawei, Yang Fan, and Dr. Yu Zhuliang for their valuable comments, suggestions and criticisms.I have enjoyed the company and friendship of all of my friends in Singapore. I would like to thank them for making the past five years an unforgettable and invaluable experience in my life.Last, I wish to express my deepest gratitude to my dear parents, my dear brother, and my lovely four year old nephew. It is indeed their deep love and consistent encouragement that has kept me focused, determined, cheered up, and never to say give up.

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Near- and Far-Field Communications with Large Intelligent Surfaces

Cited by 26 publications

References 7 publications

Holographic MIMO Communications: Theoretical Foundations, Enabling Technologies, and Future Directions

Holographic MIMO Communications: Theoretical Foundations, Enabling Technologies, and Future Directions

Energy Focusing for Wireless Power Transfer in the Near-Field Region

Very large scale integration architectures of discrete transforms for digital signal processing applications

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