Research Associates

Dr.-Ing. Krishan Kumar Tiwari

Doctoral thesis

Pragmatic array-fed RIS hybrid multiuser MIMO: modeling, analysis, and precoding design

2026 · Doctoral thesis, TU Berlin

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Publications

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Artificial Magnetic Conductor Frame to Improve Impedance Matching and Radiation Symmetry in 2$\times$2 Array for 6G Applications
Edoardo Giusti, Krishan Kumar Tiwari, C. J. Reddy, Danilo Brizi, Agostino Monorchio, Giuseppe Caire
arXiv (Cornell University) · 2026
arxiv.org BibTeX
An Efficient, Modular, and Pragmatic Array-Fed RIS Architecture for Multiuser MIMO
Krishan Kumar Tiwari, Giuseppe Caire
IEEE Trans. Wirel. Commun. · 2026
IEEE Xplore BibTeX
Codebook Design and Baseband Precoding for Pragmatic Array-Fed RIS Hybrid Multiuser MIMO
Krishan Kumar Tiwari, Giuseppe Caire
arXiv (Cornell University) · 2026
arxiv.org arxiv.org BibTeX
Artificial Magnetic Conductor Frame to Improve Impedance Matching and Radiation Symmetry in 2\unicode107612 Array for 6G Applications
Edoardo Giusti, Krishan Kumar Tiwari, C. J. Reddy, Danilo Brizi, Agostino Monorchio, Giuseppe Caire
CoRR · 2026
arxiv.org BibTeX
Flat-Top Beamforming with Efficient Array-Fed RIS
Krishan Kumar Tiwari, Giuseppe Caire
arXiv (Cornell University) · 2025
arxiv.org BibTeX
Array-Fed RIS: Validation of Friis-Based Modeling Using Full-Wave Simulations
Krishan Kumar Tiwari, Thomas Flisgen, W. Heinrich, G. Caire
arXiv (Cornell University) · 2025
arxiv.org DOI BibTeX
A Modular Pragmatic Architecture for Multiuser MIMO with Array-Fed RIS
Krishan Kumar Tiwari, Giuseppe Caire
arXiv (Cornell University) · 2024
arxiv.org BibTeX
Power Transfer between Two Antenna Arrays in the Near Field
Krishan Kumar Tiwari, G. Caire
99th IEEE Vehicular Technology Conference, VTC Spring 2024, Singapore, June 24-27, 2024 · 2024· 4 citations
IEEE Xplore BibTeX
RIS-Based Steerable Beamforming Antenna with Near-Field Eigenmode Feeder
Krishan Kumar Tiwari, Giuseppe Caire
2023
IEEE Xplore BibTeX
A New Old Idea: Beam-Steering Reflectarrays for Efficient Sub-THz Multiuser MIMO
Krishan Kumar Tiwari, Giuseppe Caire
CoRR · 2023
arxiv.org TechRxiv BibTeX
Power Transfer between Two Antenna Arrays in the Near Field
Krishan Kumar Tiwari, Giuseppe Caire
IEEE Vehicular Technology Conference · 2023
arxiv.org arxiv.org BibTeX
On the Behavior of the Near-Field Propagation Matrix between two Antenna Arrays, with Applications to RIS-Based Over-the-Air Beamforming
Krishan Kumar Tiwari, Giuseppe Caire
2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring) · 2022· 6 citations
IEEE Xplore BibTeX
Rate Loss due to Beam Cusping in Grid of Beams
Krishan Kumar Tiwari, Giuseppe Caire
2022 IEEE 96th Vehicular Technology Conference (VTC2022-Fall) · 2022· 6 citations
PDF IEEE Xplore BibTeX
RIS-Based Steerable Beamforming Antenna with Near-Field Eigenmode Feeder
Krishan Kumar Tiwari, Giuseppe Caire
arXiv (Cornell University) · 2022
arxiv.org arxiv.org BibTeX