3 citations · 14 across the 8 of their papers we have counts for
11 papers
Codebook Design and Baseband Precoding for Pragmatic Array-Fed RIS Hybrid Multiuser MIMO
Krishan Kumar Tiwari, Giuseppe Caire
In our previous work [2], we introduced a hardware- and power-efficient architecture for hybrid digital-analog (HDA) multiuser MIMO (MU-MIMO) based on stacking identical basic modu…
Artificial Magnetic Conductor Frame to Improve Impedance Matching and Radiation Symmetry in 22 Array for 6G Applications
Edoardo Giusti, Krishan Kumar Tiwari, C. J. Reddy +3
An Artificial Magnetic Conductor (AMC) frame capable of improving the impedance matching of a 22 array for 6G applications without degrading isolation performance is presen…
Array-Fed RIS: Validation of Friis-Based Modeling Using Full-Wave Simulations
Krishan Kumar Tiwari, Thomas Flisgen, Wolfgang Heinrich +1
Space-fed large antenna arrays offer superior efficiency, simplicity, and reductions in size, weight, power, and cost (SWaP-C) compared to constrained-feed systems. Historically, h…
Flat-Top Beamforming with Efficient Array-Fed RIS
Krishan Kumar Tiwari, Giuseppe Caire
Flat-top beam designs are essential for uniform power distribution over a wide angular sector for applications such as 5G/6G networks, beaconing, satellite communications, radar sy…
A Modular Pragmatic Architecture for Multiuser MIMO with Array-Fed RIS
Krishan Kumar Tiwari, Giuseppe Caire
We propose a power- and hardware-efficient, pragmatic, modular, multiuser/multibeam array-fed RIS architecture particularly suited to operate in very high frequency bands (high mmW…
A New Old Idea: Beam-Steering Reflectarrays for Efficient Sub-THz Multiuser MIMO
Krishan Kumar Tiwari, Giuseppe Caire
We present a novel, power- & hardware-efficient, multiuser, multibeam RIS (Reflective Intelligent Surface) architecture for multiuser MIMO, especially for very high frequency bands…
Power Transfer between Two Antenna Arrays in the Near Field
Krishan Kumar Tiwari, Giuseppe Caire
We present numerical results with a focus on power transfer between two standard linear antenna arrays placed in the near field, where a much smaller active multi-antenna feeder (A…
RIS-Based Steerable Beamforming Antenna with Near-Field Eigenmode Feeder
Krishan K. Tiwari, Giuseppe Caire
We present a novel, power and hardware efficient, antenna system leveraging the eigenmodes of the over-the-air propagation matrix from an active multi-antenna feeder (AMAF) to a la…
Beam Entropy of 5G Cellular Millimetre-Wave Channels
Krishan Kumar Tiwari, Eckhard Grass, John S. Thompson +1
In this paper, we obtain and study typical beam entropy values for millimetre wave (mm-wave) channel models using the NYUSIM simulator for frequencies up to 100 GHz for fifth gener…
Memory-assisted Statistically-ranked RF Beam Training Algorithm for Sparse MIMO
Krishan K. Tiwari, Eckhard Grass, John S. Thompson +1
This paper presents a novel radio frequency (RF) beam training algorithm for sparse multiple input multiple output (MIMO) channels using unitary RF beamforming codebooks at transmi…
Monopulse-based THz Beam Tracking for Indoor Virtual Reality Applications
Krishan Kumar Tiwari, Vladica Sark, Eckhard Grass +1
Terahertz spectrum is being researched upon to provide ultra-high throughput radio links for indoor applications, e.g., virtual reality (VR), etc. as well as outdoor applications,…