102 citations · 165 across the 12 of their papers we have counts for
13 papers
Knowledge Graph-Based approach for Sustainable 6G End-to-End System Design
Akshay Jain, Sylvaine Kerboeuf, Sokratis Barmpounakis +17
Previous generations of cellular communication, such as 5G, have been designed with the objective of improving key performance indicators (KPIs) such as throughput, latency, etc. H…
Downlink Power Control based UE-Sided Initial Access for Tactical 5G NR
Akshay Jain, Karthik Upadhya, Mikko A. Uusitalo +1
Communication technologies play a crucial role in battlefields. They are an inalienable part of any tactical response, whether at the battlefront or inland. Such scenarios require…
LPD-Aware Uplink CSI-based 5G NR Downlink Synchronization for Tactical Networks
Karthik Upadhya, Akshay Jain, Mikko A. Uusitalo +1
5G NR is touted to be an attractive candidate for tactical networks owing to its versatility, scalability, and low cost. However, tactical networks need to be stealthy, where an ad…
Heterogeneous Rank Beamforming for Industrial Communications
Andrea Bedin, Akshay Jain, Andrea Zanella +1
This paper proposes a novel hardware beamforming architecture, which is capable of utilizing a different number of Radio Frequency (RF) chains in different parts of the bandwidth.…
28 GHz NLOS Channel Measurements Revealing Low Path Loss and High Angular Spread in Container Ports
Andrea Bedin, Dmitry Chizhik, Jinfeng Du +4
This paper presents results from a comprehensive measurement campaign conducted at 28 GHz inside a container canyon within a commercial port environment. The measurements are perfo…
Digital Twins for Industry 4.0 in the 6G Era
Bin Han, Mohammad Asif Habibi, Bjoern Richerzhagen +10
Having the Fifth Generation (5G) mobile communication system recently rolled out in many countries, the wireless community is now setting its eyes on the next era of Sixth Generati…
Jamming Resilient Indoor Factory Deployments: Design and Performance Evaluation
Leonardo Chiarello, Paolo Baracca, Karthik Upadhya +3
In the framework of 5G-and-beyond Industry 4.0, jamming attacks for denial of service are a rising threat which can severely compromise the system performance. Therefore, in this p…
Jamming Detection With Subcarrier Blanking for 5G and Beyond in Industry 4.0 Scenarios
Leonardo Chiarello, Paolo Baracca, Karthik Upadhya +2
Security attacks at the physical layer, in the form of radio jamming for denial of service, are an increasing threat in the Industry 4.0 scenarios. In this paper, we consider the p…
On the Spectral Efficiency for Massive MIMO Systems With Imperfect Spacial Covariance Information
A. K. Kocharlakota, K. Upadhya, S. A. Vorobyov
This paper studies the impact of imperfect channel covariance information on the uplink (UL) and downlink (DL) spectral efficiencies (SEs) of a time-division duplexed (TDD) massive…
Covariance Matrix Estimation for Massive MIMO
Karthik Upadhya, Sergiy A. Vorobyov
We propose a novel pilot structure for covariance matrix estimation in massive multiple-input multiple-output (MIMO) systems in which each user transmits two pilot sequences, with…
Downlink Performance of Superimposed Pilots in Massive MIMO systems
Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera
In this paper, we investigate the downlink throughput performance of a massive multiple-input multiple-output (MIMO) system that employs superimposed pilots for channel estimation.…
Superimposed Pilots are Superior for Mitigating Pilot Contamination in Massive MIMO
Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera
In this paper, superimposed pilots are introduced as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple…
A Risk Minimization Framework for Channel Estimation in OFDM Systems
Karthik Upadhya, Chandra Sekhar Seelamantula, K. V. S. Hari
We address the problem of channel estimation for cyclic-prefix (CP) Orthogonal Frequency Division Multiplexing (OFDM) systems. We model the channel as a vector of unknown determini…