4 papers
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…