Search Results for author: Klaus Witrisal

Found 21 papers, 2 papers with code

MIMO Multipath-based SLAM for Non-Ideal Reflective Surfaces

no code implementations22 Apr 2024 Lukas Wielandner, Alexander Venus, Thomas Wilding, Klaus Witrisal, Erik Leitinger

Multipath-based simultaneous localization and mapping (MP-SLAM) is a well established approach to obtain position information of transmitters and receivers as well as information regarding the propagation environments in future multiple input multiple output (MIMO) communication systems.

Simultaneous Localization and Mapping

Fusion of Active and Passive Measurements for Robust and Scalable Positioning

no code implementations24 Mar 2024 Hong Zhu, Alexander Venus, Erik Leitinger, Stefan Tertinek, Klaus Witrisal

Then, a joint tracking algorithm that utilizes both active and passive measurements is developed for the extended object.

Object

"UWBCarGraz" Dataset for Car Occupancy Detection using Ultra-Wideband Radar

no code implementations17 Nov 2023 Jakob Möderl, Stefan Posch, Franz Pernkopf, Klaus Witrisal

Our presented ResNet architecture is able to outperform the VMP algorithm in terms of the area under the receiver operating curve (AUC) at low signal-to-noise ratios (SNRs) for all three activity levels of the target.

Graph-based Simultaneous Localization and Bias Tracking

no code implementations4 Oct 2023 Alexander Venus, Erik Leitinger, Stefan Tertinek, Florian Meyer, Klaus Witrisal

We demonstrate that the position-related information enables the algorithm to provide high-accuracy position estimates even in fully obstructed line-of-sight (OLOS) situations.

Position

A Neural-enhanced Factor Graph-based Algorithm for Robust Positioning in Obstructed LOS Situations

no code implementations30 Aug 2023 Alexander Venus, Erik Leitinger, Stefan Tertinek, Klaus Witrisal

This paper presents a neural-enhanced probabilistic model and corresponding factor graph-based sum-product algorithm for robust localization and tracking in multipath-prone environments.

Position

Super-Resolution Estimation of UWB Channels including the Diffuse Component -- An SBL-Inspired Approach

no code implementations3 Aug 2023 Stefan Grebien, Erik Leitinger, Klaus Witrisal, Bernard H. Fleury

Specifically, the algorithm super-resolves the specular components in the delay-angle-of-arrival domain and estimates the parameters of a parametric model of the delay-angle power spectrum characterizing the diffuse component.

Super-Resolution

Fast Variational Block-Sparse Bayesian Learning

1 code implementation1 Jun 2023 Jakob Möderl, Franz Pernkopf, Klaus Witrisal, Erik Leitinger

We present a fast update rule for variational block-sparse Bayesian learning (SBL) methods.

Bistatic MIMO Radar Sensing of Specularly Reflecting Surfaces for Wireless Power Transfer

1 code implementation8 May 2023 Benjamin J. B. Deutschmann, Maximilian Graber, Thomas Wilding, Klaus Witrisal

Geometric environment information aids future distributed radio infrastructures in providing services, such as ultra-reliable communication, positioning, and wireless power transfer (WPT).

Variational Inference of Structured Line Spectra Exploiting Group-Sparsity

no code implementations6 Mar 2023 Jakob Möderl, Franz Pernkopf, Klaus Witrisal, Erik Leitinger

The spectral lines in each group are associated with a group parameter common to all spectral lines within the group.

Variational Inference

XL-MIMO Channel Modeling and Prediction for Wireless Power Transfer

no code implementations23 Feb 2023 Benjamin J. B. Deutschmann, Thomas Wilding, Maximilian Graber, Klaus Witrisal

Massive antenna arrays form physically large apertures with a beam-focusing capability, leading to outstanding wireless power transfer (WPT) efficiency paired with low radiation levels outside the focusing region.

Message Passing-Based 9-D Cooperative Localization and Navigation with Embedded Particle Flow

no code implementations3 Jan 2023 Lukas Wielandner, Erik Leitinger, Florian Meyer, Klaus Witrisal

However, particle-based BP algorithms are known to suffer from particle degeneracy in large and dense networks of mobile agents with high-dimensional states.

Variational Message Passing-Based Respiratory Motion Estimation and Detection Using Radar Signals

no code implementations14 Oct 2022 Jakob Möderl, Erik Leitinger, Franz Pernkopf, Klaus Witrisal

We present a variational message passing (VMP) approach to detect the presence of a person based on their respiratory chest motion using multistatic ultra-wideband (UWB) radar.

Motion Estimation

A Graph-based Algorithm for Robust Sequential Localization Exploiting Multipath for Obstructed-LOS-Bias Mitigation

no code implementations18 Jul 2022 Alexander Venus, Erik Leitinger, Stefan Tertinek, Klaus Witrisal

This paper presents a factor graph formulation and particle-based sum-product algorithm (SPA) for robust sequential localization in multipath-prone environments.

Position Single Particle Analysis

Statistical Modeling of the Human Body as an Extended Antenna

no code implementations25 Mar 2021 Thomas Wilding, Erik Leitinger, Ulrich Muehlmann, Klaus Witrisal

By comparing measurements of the antenna attached directly to the user with measurements for the antenna without the user nearby, we show the shadowing and scattering effects of the human body and the antenna.

Position

RSS-based Cooperative Localization and Orientation Estimation Exploiting Directive Antenna Patterns

no code implementations24 Mar 2021 Lukas Wielandner, Erik Leitinger, Klaus Witrisal

In this paper, we propose a factor-graph-based cooperative positioning algorithm that uses RSS radio measurements and accounts for the directivity of the antennas.

Position

Multipath-based SLAM using Belief Propagation with Interacting Multiple Dynamic Models

no code implementations23 Mar 2021 Erik Leitinger, Stefan Grebien, Klaus Witrisal

In this paper, we present a Bayesian multipath-based simultaneous localization and mapping (SLAM) algorithm that continuously adapts interacting multiple models (IMM) parameters to describe the mobile agent state dynamics.

Simultaneous Localization and Mapping

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