no code implementations • 18 Apr 2023 • Emadaldin Mozafari-Majd, Visa Koivunen
We carry out extensive simulations and observe that the class of $\tau$-Lasso estimators exhibits robustness and reliable performance in both contaminated and uncontaminated data settings.
no code implementations • 10 Mar 2023 • Mert Kayaalp, Yunus Inan, Visa Koivunen, Emre Telatar, Ali H. Sayed
We consider the problem of information aggregation in federated decision making, where a group of agents collaborate to infer the underlying state of nature without sharing their private data with the central processor or each other.
no code implementations • 24 Nov 2022 • Musa Furkan Keskin, Carina Marcus, Olof Eriksson, Henk Wymeersch, Visa Koivunen
Phase noise (PN) can become a major bottleneck for integrated sensing and communications (ISAC) systems towards 6G wireless networks.
no code implementations • 17 Aug 2022 • Emadaldin Mozafari-Majd, Visa Koivunen
The proposed two-stage robust and distributed inference procedures demonstrate reliable performance and robustness in variable selection, finding confidence intervals and bootstrap approximations of standard deviations even when data is high-dimensional and contaminated by outliers.
no code implementations • 9 Jun 2022 • Yuanhao Cui, Xiaojun Jing, Visa Koivunen
Radar and modern communication systems are both evaluating towards higher frequency bands and massive antenna arrays, thus increasing their similarities in terms of hardware structure, channel characteristics, and signal processing pipelines.
no code implementations • 17 May 2022 • Musa Furkan Keskin, Henk Wymeersch, Visa Koivunen
We consider the problem of monostatic radar sensing with orthogonal frequency-division multiplexing (OFDM) joint radar-communications (JRC) systems in the presence of phase noise (PN) caused by oscillator imperfections.
1 code implementation • 27 Aug 2021 • Martin Gölz, Abdelhak M. Zoubir, Visa Koivunen
The benefits of our method are illustrated by applications to spatially propagating radio waves.
1 code implementation • 22 Jun 2021 • Philippe Mary, Visa Koivunen, Christophe Moy
In this chapter, we will give comprehensive examples of applying RL in optimizing the physical layer of wireless communications by defining different class of problems and the possible solutions to handle them.
no code implementations • 29 Mar 2021 • Musa Furkan Keskin, Henk Wymeersch, Visa Koivunen
For each estimated angle, we next formulate the radar delay-Doppler estimation as a joint carrier frequency offset (CFO) and channel estimation problem via an APES (amplitude and phase estimation) spatial filtering approach by transforming the delay-Doppler parameterized radar channel into an unstructured form.
no code implementations • 12 Feb 2021 • Musa Furkan Keskin, Henk Wymeersch, Visa Koivunen
We propose a novel three-stage delay-Doppler-angle estimation algorithm for a MIMO-OFDM radar in the presence of inter-carrier interference (ICI).
no code implementations • 18 Oct 2020 • Robin Rajamäki, Visa Koivunen
The two array structures also achieve low redundancy, and a contiguous sum and difference co-array, which allows resolving vastly more scatterers or sources than sensors
no code implementations • 2 Dec 2019 • Robin Rajamäki, Sundeep Prabhakar Chepuri, Visa Koivunen
Simulations demonstrate that a hybrid sparse array with very few elements, and even fewer front ends, can achieve the resolution of a fully digital uniform array at the expense of a longer image acquisition time.
no code implementations • 6 Apr 2017 • Hassan Naseri, Visa Koivunen
In this paper, the novel Message Passing Hybrid Localization (MPHL) algorithm is proposed to solve the problem of cooperative distributed localization using distance and direction estimates.
no code implementations • 9 Apr 2015 • Shahab Basiri, Esa Ollila, Visa Koivunen
In this paper we address the problem of performing statistical inference for large scale data sets i. e., Big Data.