Dynamic Metasurface Antennas Based Downlink Massive MIMO Systems

Wang, Hanqing; Shlezinger, Nir; Jin, Shi; Eldar, Yonina C.; Yoo, Insang; Imani, Mohammadreza F.; Smith, David R.

doi:10.1109/spawc.2019.8815427

Cited by 29 publications

(20 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resulting non-zero weights are given byq i,l = j+e jψ * i,l 2 [18], and thusq i,l ∈ Q. The resultingQ is used as an approximate solution to the original optimization problem (12). Our numerical evaluations in the Section IV verify that deriving weights inQ followed by their projection onto Q yields accurate focused beams.…”

Section: Problem Formulationmentioning

confidence: 74%

“…2). Thus, the phase and amplitude of qi,l are coupled, which makes it challenging to solve (12). To tackle this problem, we employ the constant amplitude approach proposed in [18] to relax the Lorentzian constraint to the phase-only weights constraint with constant amplitude and arbitrary phase, given by…”

Section: Problem Formulationmentioning

confidence: 99%

“…2). We next focus on problem (12) with Q replaced byQ, and use the solution to tune the Lorentzian-constrained weights via projection (see Fig. 2).…”

Section: Problem Formulationmentioning

confidence: 99%

See 2 more Smart Citations

Beam Focusing for Multi-User MIMO Communications with Dynamic Metasurface Antennas

Zhang

Shlezinger

Guidi

et al. 2021

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Self Cite

View full text Add to dashboard Cite

Recently, dynamic metasurface antennas (DMAs) have emerged as a promising technology for realizing massive multipleinput multiple-output (MIMO) wireless systems. The usage of large arrays, jointly with higher transmitted frequencies, often results in the communicating devices operating in the near-field (Fresnel) region, thus requiring different considerations compared to traditional systems, assumed to operate in the far-field regime. In this paper, we study the potential of beam focusing, feasible in near-field operation, for multiuser MIMO systems, where the base station is equipped with a DMA. We introduce a mathematical model for DMA-based near-field MIMO communications. Then, we characterize the sum-rate maximization problem of the considered system, and propose an efficient solution to jointly design the DMA weights and digital precoding vector. Simulation results show that our design generates focused beams such that users residing at the same angular direction can communicate reliably without interfering, which is not achievable using conventional far-field beam steering.Index terms-Beam focusing, dynamic metasurface antennas.

show abstract

Section: Problem Formulationmentioning

confidence: 74%

Section: Problem Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Beam Focusing for Multi-User MIMO Communications with Dynamic Metasurface Antennas

Zhang

Shlezinger

Guidi

et al. 2021

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The frequency response of each element is independently adjustable by varying its local dielectric properties [16]. For DMA-based transmitters, each microstrip is fed by an RF chain, and the input signal is radiated by all the elements within the same microstrip [17].…”

Section: A Dynamic Metasurface Antennasmentioning

confidence: 99%

Near-Field Wireless Power Transfer with Dynamic Metasurface Antennas

Zhang¹,

Shlezinger²,

Guidi³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Radio frequency wireless power transfer (WPT) enables charging low-power mobile devices without relying on wired infrastructure. Current existing WPT systems are typically designed assuming far-field propagation, where the radiated energy is steered in given angles, resulting in limited efficiency and possible radiation in undesired locations. When large arrays at high frequencies, such as dynamic metasurface antenna (DMA), are employed, WPT might take place in the radiating near-field (Fresnel) region where spherical wave propagation holds, rather than plane wave propagation as in the far-field.In this paper, we study WPT systems charging multiple devices in the Fresnel region, where the energy transmitter is equipped with an emerging DMA, exploring how the antenna configuration can exploit the spherical wavefront to generate focused energy beams. In particular, after presenting a mathematical model for DMA-based radiating nearfield WPT systems, we characterize the weighted sum-harvested energy maximization problem of the considered system, and we propose an efficient solution to jointly design the DMA weights and digital precoding vector. Simulation results show that our design generates focused energy beams that are capable of improving energy transfer efficiency in the radiating near-field with minimal energy pollution.Index terms-Radiating near-field, wireless power transfer, beam focusing, dynamic metasurface antennas.

show abstract

“…Besides, a large number of tunable radiating elements can be packed in a small physical area for a wide range of operating frequencies. In [9], practical mMIMO systems with RIS antenna is proofed to be comparable to that with ideal antenna arrays. By far, RIS antenna has not been discussed in physical layer security.…”

mentioning

confidence: 98%