48 citations · 296 across the 40 of their papers we have counts for
7 papers · 1 filter
Feedback Does Not Increase the Capacity of Compound Channels with Additive Noise
Sergey Loyka, Charalambos D. Charalambous
A discrete compound channel with memory is considered, where no stationarity, ergodicity or information stability is required, and where the uncertainty set can be arbitrary. When…
The Capacity of Gaussian MIMO Channels Under Total and Per-Antenna Power Constraints
S. Loyka
The capacity of a fixed Gaussian multiple-input multiple-output (MIMO) channel and the optimal transmission strategy under the total power (TP) constraint and full channel state in…
Optimal Signaling for Secure Communications over Gaussian MIMO Wiretap Channels
Sergey Loyka, Charalambos D. Charalambous
Optimal signalling over the Gaussian MIMO wire-tap channel is studied under the total transmit power constraint. A closed-form solution for an optimal transmit covariance matrix is…
Rank-Deficient Solutions for Optimal Signaling over Wiretap MIMO Channels
Sergey Loyka, Charalambos D. Charalambous
Capacity-achieving signaling strategies for the Gaussian wiretap MIMO channel are investigated without the degradedness assumption. In addition to known solutions, a number of new…
A General Formula for Compound Channel Capacity
Sergey Loyka, Charalambos D. Charalambous
A general formula for the capacity of arbitrary compound channels with the receiver channel state information is obtained using the information density approach. No assumptions of…
Capacity Achieving Distributions & Information Lossless Randomized Strategies for Feedback Channels with Memory: The LQG Theory of Directed Information-Part II
Charalambos D. Charalambous, Christos K. Kourtellaris, Sergey Loyka
A methodology is developed to realized optimal channel input conditional distributions, which maximize the finite-time horizon directed information, for channels with memory and fe…
Optimal Estimation via Nonanticipative Rate Distortion Function and Applications to Time-Varying Gauss-Markov Processes
Photios A. Stavrou, Themistoklis Charalambous, Charalambos D. Charalambous +1
In this paper, we develop {finite-time horizon} causal filters using the nonanticipative rate distortion theory. We apply the {developed} theory to {design optimal filters for} tim…