68 citations · 372 across the 44 of their papers we have counts for
7 papers · 1 filter
The fixed point iteration of positive concave mappings converges geometrically if a fixed point exists: implications to wireless systems
Tomasz Piotrowski, Renato L. G. Cavalcante
We prove that the fixed point iteration of arbitrary positive concave mappings with nonempty fixed point set converges geometrically for any starting point. We also show that posit…
Deep Learning Beam Optimization in Millimeter-Wave Communication Systems
Rafail Ismayilov, Renato L. G. Cavalcante, Sławomir Stańczak
We propose a method that combines fixed point algorithms with a neural network to optimize jointly discrete and continuous variables in millimeter-wave communication systems, so th…
Deep Learning Based Hybrid Precoding in Dual-Band Communication Systems
Rafail Ismayilov, Renato L. G. Cavalcante, Sławomir Stańczak
We propose a deep learning-based method that uses spatial and temporal information extracted from the sub-6GHz band to predict/track beams in the millimeter-wave (mmWave) band. In…
Fixed points of nonnegative neural networks
Tomasz J. Piotrowski, Renato L. G. Cavalcante, Mateusz Gabor
We use fixed point theory to analyze nonnegative neural networks, which we define as neural networks that map nonnegative vectors to nonnegative vectors. We first show that nonnega…
Robust Cell-Load Learning with a Small Sample Set
Daniyal Amir Awan, Renato L. G. Cavalcante, Slawomir Stanczak
Learning of the cell-load in radio access networks (RANs) has to be performed within a short time period. Therefore, we propose a learning framework that is robust against uncertai…
Set-Theoretic Learning for Detection in Cell-Less C-RAN Systems
Daniyal Amir Awan, Renato L. G. Cavalcante, Zoran Utkovski +1
Cloud-radio access network (C-RAN) can enable cell-less operation by connecting distributed remote radio heads (RRHs) via fronthaul links to a powerful central unit. In conventiona…
Multi-Group Multicast Beamforming by Superiorized Projections onto Convex Sets
Jochen Fink, Renato L. G. Cavalcante, Slawomir Stanczak
In this paper, we propose an iterative algorithm to address the nonconvex multi-group multicast beamforming problem with quality-of-service constraints and per-antenna power constr…