15 citations · 51 across the 10 of their papers we have counts for
4 papers · 1 filter
ToFFi -- Toolbox for Frequency-based Fingerprinting of Brain Signals
Michał K. Komorowski, Krzysztof Rykaczewski, Tomasz Piotrowski +5
Spectral fingerprints (SFs) are unique power spectra signatures of human brain regions of interest (ROIs, Keitel & Gross, 2016). SFs allow for accurate ROI identification and can s…
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…
Relaxed Zero-Forcing Beamformer under Temporally-Correlated Interference
Takehiro Kono, Masahiro Yukawa, Tomasz Piotrowski
The relaxed zero-forcing (RZF) beamformer is a quadratically-and-linearly constrained minimum variance beamformer. The central question addressed in this paper is whether RZF perfo…
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…