Search Results for author: Visa Koivunen

Found 14 papers, 2 papers with code

The Adaptive $τ$-Lasso: Robustness and Oracle Properties

no code implementations18 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.

regression Variable Selection

On the Fusion Strategies for Federated Decision Making

no code implementations10 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.

Decision Making

On the Impact of Phase Noise on Monostatic Sensing in OFDM ISAC Systems

no code implementations24 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.

Two-Stage Robust and Sparse Distributed Statistical Inference for Large-Scale Data

no code implementations17 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.

Model Selection Variable Selection

Precoder and Decoder Co-Designs for Radar and Communication Spectrum Sharing

no code implementations9 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.

Philosophy

Monostatic Sensing with OFDM under Phase Noise: From Mitigation to Exploitation

no code implementations17 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.

Multiple Hypothesis Testing Framework for Spatial Signals

1 code implementation27 Aug 2021 Martin Gölz, Abdelhak M. Zoubir, Visa Koivunen

The benefits of our method are illustrated by applications to spatially propagating radio waves.

Reinforcement Learning for Physical Layer Communications

1 code implementation22 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.

Multi-Armed Bandits Q-Learning +2

MIMO-OFDM Joint Radar-Communications: Is ICI Friend or Foe?

no code implementations29 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.

ICI-Aware Parameter Estimation for MIMO-OFDM Radar via APES Spatial Filtering

no code implementations12 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).

Sparse Symmetric Linear Arrays with Low Redundancy and a Contiguous Sum Co-Array

no code implementations18 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

Hybrid Beamforming for Active Sensing using Sparse Arrays

no code implementations2 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.

A Bayesian algorithm for distributed network localization using distance and direction data

no code implementations6 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.

Robust, scalable and fast bootstrap method for analyzing large scale data

no code implementations9 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.

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