Reiner S. Thomä

Technische Universität Ilmenau

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Christian Schneider

Technische Universität Ilmenau

114

Giovanni Del Galdo

Technische Universität Ilmenau

Diego Dupleich

Technische Universität Ilmenau

Gerd Sommerkorn

Technische Universität Ilmenau

Robert Müller

Technische Universität Ilmenau

Rudolf Zetík

Fraunhofer Institute for Integrated Circuits

Matthias Hein

Technische Universität Ilmenau

Martin Käske

Technische Universität Ilmenau

Stephan Häfner

Heidelberg University

Jian Luo

Huawei Technologies (Germany)

Cooperative Institutions

Technische Universität Ilmenau

167

Oldenburger Institut für Informatik

Fraunhofer Institute for Integrated Circuits

RWTH Aachen University

Friedrich-Alexander-Universität Erlangen-Nürnberg

Karlsruhe Institute of Technology

University of Duisburg-Essen

Huawei Technologies (Germany)

University of Oulu

Fraunhofer Society

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Identification of time-variant directional mobile radio channels

IEEE Transactions on Instrumentation and Measurement (2000)

Reiner S. Thomä D. Hampicke Andreas Richter Gerd Sommerkorn Axel Schneider

For the identification of the time-variant, directional structure of the mobile radio channel impulse response (CIR), a broadband vector channel sounder is described. The measurement procedure relies on periodic multifrequency excitation signals, correlation processing, and joint delay-azimuth super-resolution based on the two-dimensional (2-D) unitary ESPRIT algorithm. Problems of imperfect receiver and antenna performance as well as antenna array calibration methods are discussed. Correlation analysis of the directional impulse response records is performed in the time-frequency-spatial domain and the corresponding Doppler-delay-angular domain. Results from measurements in the 5.2 GHz frequency range in an industrial environment are presented.

Impulse response

10.1109/19.843078

Cite

Citations (233)

Channel Correlation Diversity in MU-MIMO Systems – Analysis and Measurements

Harsh Tataria Seun Sangodoyin Andreas F. Molisch Peter J. Smith Michail Matthaiou

In multiuser multiple-input multiple-output (MU-MIMO) systems, channel correlation is detrimental to system performance. We demonstrate that widely used, yet overly simplified, correlation models that generate identical correlation profiles for each terminal tend to severely underestimate the system performance. In sharp contrast, more physically motivated models that capture variations in the power angular spectra across multiple terminals, generate diverse correlation patterns. This has a significant impact on the system performance. Assuming correlated Rayleigh fading and downlink zero-forcing precoding, tight closed-form approximations for the average signal- to-noise-ratio, and ergodic sum spectral efficiency are derived. Our expressions provide clear insights into the impact of diverse correlation patterns on the above performance metrics. Unlike previous works, the correlation models are parameterized with measured data from a recent 2.53 GHz urban macrocellular campaign in Cologne, Germany. Overall, results from this paper can be treated as a timely re-calibration of performance expectations from practical MU-MIMO systems.

Spectral Efficiency

Spatial correlation

10.1109/pimrc.2019.8904875

Cite

Citations (6)

Measurement and identification of mobile radio propagation channels

Reiner S. Thomä D. Hampicke Andreas Richter Gerd Sommerkorn

MIMO vector radio channel sounding devices allow multidimensional analysis of wave propagation in mobile radio channels. 6-dimensions represent Doppler, TDOA, 2D DOD and 2D DOA. Antenna array architectures, calibration and K-D unitary ESPRIT parameter estimation are discussed. Parametric channel models can be derived from the estimated data.

Channel sounding

Parametric model

10.1109/imtc.2001.928261

Cite

Citations (6)

Enhanced Vehicle Localization in Urban NLoS Using Multipath Ray Tracing Fingerprints

2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall) (2018)

Marcelo N. de Sousa Reiner S. Thomä

Identifying the precise location of a vehicular mobile is a challenging task because satellite navigation system standalone is unable to give the expected performance in an Urban propagation scenario. This paper proposes a novel technique which integrates ray-tracing simulation tool and Channel Impulse Response (CIR) estimation and improves the vehicular location even in a Dense Multipath (DM) scenario. In this paper, we try to overcome these limitations and propose a novel technique of using the Ray-tracing simulation tool to build a radio frequency map of CIE of every point in the simulation domain. Finally, we match the multipath components drawn estimated to a defined location. The proposed scheme is comparatively much accurate to other state-of-art techniques for position estimation.

Non-line-of-sight propagation

Impulse response

Tracing

Position (finance)

10.1109/vtcfall.2018.8690642

Cite

Citations (1)

Using Quaternion-Valued Linear Algebra

arXiv (Cornell University) (2013)

Dominik Schulz Reiner S. Thomä

Linear algebra is usually defined over a field such as the reals or complex numbers. It is possible to extend this to skew fields such as the quaternions. However, to the authors' knowledge there is no commonly accepted notation of linear algebra over skew fields. To this end, we discuss ways of notation that account for the non-commutativity of the quaternion multiplication.

Quaternion algebra

Linear algebra

10.48550/arxiv.1311.7488

Cite

Citations (3)

Statistics of Vehicular Detectability for Cooperative Passive Coherent Location at Urban Crossroad

2022 IEEE Radar Conference (RadarConf22) (2021)

Saw James Myint Steffen Schieler Christian Schneider Wim Kotterman Giovanni Del Galdo

The statistical study of target detectability is crucial in radar system design. In this regard, signal-to-noise ratio (SNR) of the received signal at the radar's receiver is a key parameter and therefore every influence on SNR should be taken into account. One of the main influences is the fluctuation of the target scattering/reflectivity to the incident electromagnetic wave. Consequently, the target fluctuation models and their accuracy become important. For monostatic radar system, various models can be found in the literature. In contrast, this paper studies a case of vehicular sensing scenario with multistatic configuration for an urban crossroad and proposes a modelling method of the target fluctuation by taking into account the target information, such as size, shape and composed materials, and the wave information, such as polarizations and aspect angles. Furthermore, the derived target fluctuation models are then applied directly to the formulation of the probability of detection for multistatic radar system. These probabilities of detection are also compared to that of monostatic radar system.

Multistatic radar

Passive Radar

SIGNAL (programming language)

Radar detection

10.1109/radarconf2147009.2021.9454971

Cite

Citations (2)

Double-directional and dual-polarimetric indoor measurements at 70 GHz

Diego Dupleich Stephan Häfner Christian Schneider Robert Müller Reiner S. Thomä

Double-directional, ultra wideband dual-polarized channel measurements at 70 GHz have been carried out in a small-office environment. The aim of these measurements is to study the temporal, directional, and polarization properties of the channel for modelling purposes of the future wireless communication systems at mm-waves. A highly deterministic behaviour of the channel and the environment has been identified, as well as the limitations of only parameterizing channel models as WINNER for the new mm-wave channel models.

Wideband

Dual-polarization interferometry

10.1109/pimrc.2015.7343669

Cite

Citations (15)

Robust likelihood function for blind mobile terminal localization

GI Jahrestagung (2) (2010)

Vadim Algeier Reiner S. Thomä Wolfgang Koch

Source

Cite

Citations (1)

Excitation Signal Design for THz Channel Sounding and Propagation Parameter Estimation

Jonas Gedschold Sebastian Semper Michael Döbereiner Reiner S. Thomä

In this publication, we analyze how the performance of propagation parameter estimation for THz channel sounding can be improved by the power spectrum design of a multicarrier waveform. To this end, we discuss the Fisher information of the propagation parameters and the corresponding deterministic Cramèr-Rao lower bound (CRB) as well as their relation to the carrier powers of the excitation signal. We use these quantities to design waveforms that improve range estimation. In practice, optimizing the power spectrum requires prior knowledge of the propagation scenario which is usually not available. Hence, we propose two solutions which we compare numerically to the classical approach of equal power distribution. The numerical evaluation shows that an optimized power distribution can improve the CRB comparable up to a 4 dB gain in SNR depending on whether knowledge about the scenario can be acquired in advance with an additional measurement. © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Status: Accepted for presentation at the EuCAP conference 2024 https://www.eucap2024.org/ .

Channel sounding

10.36227/techrxiv.170327781.12377648/v1

Cite

Citations (0)

Indirect Localization and Imaging of Objects in an UWB Sensor Network

IEEE Transactions on Instrumentation and Measurement (2010)

Ole Hirsch Malgorzata Janson W. Wiesbeck Reiner S. Thomä

A method for the localization and the rough 2-D microwave imaging of objects is described. It detects and utilizes line-of-sight (LOS) paths between a mobile node and several fixed nodes of a distributed ultrawideband (UWB) sensor network. Objects are imaged in an indirect way, i.e., by a combination of maps, which show the distribution of LOS paths of individual network nodes. The method is demonstrated by means of ray-tracing simulations and measurements in a realistic environment. Performance limitation by diffraction and the question of temporal network node synchronization are discussed.

Microwave Imaging

Visual sensor network

Line-of-sight

10.1109/tim.2010.2046359

Cite

Citations (12)