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Bachelor- und Master-Arbeiten

Update Stand 05/2020

Alle im Folgenden aufgelisteten Arbeiten können in Deutscher oder Englischer Sprache betreut werden.

All topics listed below can be supervised in German or English language


 

1. Antenna design and measurement

Active research staff: M.Sc. Jasmeet Singh, M.Sc. Ehtisham Asghar, M.Sc. Philipp Berlt, M.Sc. Syed Naser Hasnain

This research field deals with a variety of hot topics on antennas, arrays and system applications. The focus is on the design of novel antennas with enhanced functional performance for applications like automated and connected driving, robust satellite navigation, and advanced antenna measurement and data processing techniques. Our partners come from automotive industry (e.g., Mercedes-Benz), tier-1 automotive suppliers (e.g., Continental), local antenna industry (e.g., Funkwerk, Antennentechnik Bad Blankenburg, Wiegand), as well as signal-processing and software houses (e.g., Microwave Vision Group, dSPACE, IPG). 

Topic 1.1Compact distributed antenna systems for robust satellite navigation receivers
ObjectivesDesign and testing of compact distributed arrangements of 3-element sub-arrays for robust satellite navigation in road traffic applications, identification and feeding of eigenmodes, investigation of the impact on orthogonality on the ambiguity of direction-of-arrival estimation
MethodsNumerical simulation, fabrication of sub-arrays using off-the-shelf antennas, measurements in VISTA, analysis of measured data and comparison with analytical and simulated data


Topic 1.2Design and characterisation of 4G/5G antennas embedded in the scaled model of a locomotive roof mock-up
ObjectivesIdentification and design of suitable antennas, determination of suitable mounting positions with respect to frequency of operation, simulation for original and scaled geometries across relevant frequency ranges, measurements of scaled antennas and geometries in VISTA, performance analysis of scaling and impact of mounting positions
MethodsDesign, full-wave simulations, measurements, data post-processing and analysis


Topic 1.3Characterisation of antennas measured in VISTA under different boundary conditions
ObjectivesMeasurements of antennas under free-space conditions and over a metallic ground plane, investigation of measurement accuracy due to truncation effects (size of ground plane, elevation angle), antenna data post processing, comparison of measurement and simulations
MethodsNumerical full-wave simulations, exemplary measurements in VISTA, application of suitable post-processing tools, theoretical or numerical comparison, concepts for optimization


Topic 1.4RF-less radiation pattern measurements of antennas 
ObjectivesNovel approaches based on previous findings, for measurement of antenna patterns without access to the RF antenna feed ports, e.g., based on LTE-parameters or other, suitable, digital signals
MethodsResearch and identification of suitable measurement approaches, feasibility study in VISTA, implementation, measurements and comparison with conventional approaches


Topic 1.5Comparison of patch- and di-patch antenna arrays for automotive 5G and satellite communications in Ka-band
ObjectivesDesign of di-patch array for Ka-band including plastic embedding, manufacturing and measurement, sensitivity analysis and comparison between simulation and measurement, comparison between di-patch array and patch array results from previous work, conclusions for the suitability of di-patch arrays for the intended applications
MethodsStudy of literature available (preceding Master projects) to understand array design specifications and principles, numerical full-wave simulations in CST Microwave Studio, working with Altium designer for PCB data extraction, measurements of radiation patterns in anechoic chamber, data post-processing and analysis


2. Emulation and characterisation of the wireless propagation channels for mobile communications and automotive radar in virtual electromagnetic environment


Active research staff: M.Sc. Berk Altinel, M.Sc. Philipp Berlt, M.Sc. Sreehari Buddappagari, M.Sc. Andreas Schwind

In view of the extremely high relevance of functional safety and system validation of mobile communications and automotive radar, antenna and microwave technologies merge with driver assistance systems and virtual test environments. Our unique research facility is the “virtual road – simulation and test area” (VISTA), aiming at a complete coverage of radio propagation and connectivity issues related to wireless applications in road and rail traffic over a wide frequency range. Beside research partners like those listed for the topical area 2, the topics benefit from potential connections to the DLR Institute of Transportation Systems and world-level industrial associations like the Car-2-Car Communication Consortium or the 5G Automotive Association, as well high-level industrial partners from Japan.

Vehicle-to-everything communications

Topic 2.1Emulation of statistical channel models for V2X virtual drive tests
ObjectivesTesting of V2X communications in view of SAE levels 4 and 5 of automated and connected driving, with a focus on physical layer, identification of a suitable statistical channel model, implementation and emulation and virtual drive testing in VISTA
MethodsStudy of basic wireless mobile communication channel parameters (e.g., taps, delays), configuration and emulation of V2X relevant channel models with our multi-channel channel emulator and relevant software tools for scenario generation (e.g., SUMO, IPG carmaker), data post-pocessing and analysis

 

4G/5G mobile communications

Topic 2.2Over-the-air testing of LTE-based automotive communications in critical link scenarios
ObjectivesImplementation and testing of spatially distributed transmitter and receiver antenna panels, in order to create a dedicated radio environment in time, frequency and spatial domain, based on distributed software-defined radio (SDR) modules. Emulation and evaluation of over-the-air measurements in VISTA. Identification of “worst case” test scenarios for automotive LTE communication links.
MethodsApplication and implementation of Universal Software Radio Peripherals (USRP) with PCIE switch, control of USRP with LabVIEW as developed in previous projects, implementation of a deterministic N-path propagation scenario and a disturbed communication scenario (e.g., blocking or interference)


Topic 2.3Automotive LTE antenna performance study based on link level simulation
ObjectivesNumeric simulation of a point-to-point LTE downlink (SISO, 2x2 MIMO). Identification and categorisation of key parameters influencing the achievable downlink data throughput; differentiation between multipath propagation effects, antennas, and system implementation/scheduling. Comparison of simulated results with measured data derived from over-the-air tests in VISTA (already available).
MethodsStudy of LTE downlink signal structure and relevant performance parameters. MATLAB simulation with the LTE link level simulator provided by TU Vienna (open source). Study of properly designed parameter variations, including antenna, frontend (e.g., SNR, bandwidth), channel matrix, and transmission scheme.

 

Radar cross-section, and radar system and scenario emulation

Topic 2.4Modelling of bi-static radar cross-sections of bicyclists and pedestrians
ObjectivesElectromagnetic simulations of bi-static RCS of traffic objects employing suitable simulation techniques (hybrid solver, ray tracing), derivation of angle-dependent RCS models
MethodsStudy of existing bi-static RCS models, numerical simulations of selected traffic objects, analysis of different modelling approaches using MATLAB or Pytho


Topic 2.5Virtual verification and validation of automotive radar system using over-the-air/vehicle-in-the-loop testing in VISTA
ObjectivesImplement advanced real-world scenarios in the virtual environment and perform measurements in the radar test system in VISTA. Analyze, identify, and evaluate the performance in terms of key figures-of-merit, comparison with real-world measurementsrepresentations.
MethodsSoftware tools in dSPACE HiL-simulator, OTA/ViL radar test system in VISTA, MATLAB modelling and analysis based on existing scripts and infrastructure.


Topic 2.6Polarimetric wideband RCS measurements and characterisation of traffic infrastructure objects at automotive radar frequencies
ObjectivesTo measure absolute RCS of traffic infrastructure signs, guard rails, barricades and characterize the radar visibility in aspect angle, polarization, frequency, and statistical domains. Comparison with electromagnetic full-wave simulations
MethodsRCS measurements in VISTA using vector network analyzer and mm-wave extension modules, MATLAB analysis, Simulation in CST/HFSS

 

3. Electromagnetic compatibility

Active research staff: Dr.-Ing. Christian Bornkessel, M.Sc. Willi Hofmann, M.Sc. Lisa-Marie Schilling

Electromagnetic compatibility (EMC) characterises how well a device or system is suited to operate in an environ-ment without introducing electromagnetic disturbances that interfer with the operation of other electrical products in the environment. The human exposure to electric, magnetic, or electromagnetic fields and possible adverse health effects is a sub-category of EMC, the electromagnetic environmental compatibility.

The following projects reflect hot topics in the wider EMC field and offer the potential to cooperate with other global players in academia and industry.

Topic 3.1Exposure assessment around massive-MIMO antennas
ObjectivesFor 5G, massive MIMO antennas with traffic scenario dependent beam pattern will replace current radio base station antennas with static beams. This demands for new concepts concerning exposure assessment for the maximum possible exposure situation around the station, both by numerical and by measurement means.
MethodsLiterature study (3GPP documents LTE release 15+) concerning beam forming algorithms, development of concepts, validation at 4G and 5G test installations of different mobile phone operators in Germany.


Topic 3.2Range resolution in scattering measurements using combined frequency bands
ObjectivesApply post-processing algorithms such as time domain gating to separate the radar target signal from clutter. Investigate possible ways of combining different frequency bands, in order to increase the total bandwidth and thus the achievable time resolution.
MethodsLiterature study, theoretical studies of signals and systems, signal post-processing in MATLAB, exemplary measurements for verification


Topic 3.3Exposure measurements of C-V2X equipment for connected and automated driving
ObjectivesBesides ITS-G5, the cellular C-V2X standard with on-board and road-side units will change the electromagnetic environment for vehicle passengers and other road users. Accordingly, the electromagnetic exposure to C-V2X equipment must be assessed and evaluated.
MethodsLiterature study, identification and evaluation of test scenarios inside and outside a vehicle, implementing C-V2X units (under the reservation of availability), development and optimization of measurement methods for exposure assessment of V2X


Topic 3.4Numerical simulation of V2X-technologies for connected and automated driving
ObjectivesWireless standards like ITS-G5 and C-V2X are key to connected and automated driving. The detection of electromagnetic emissions is essential to avoid achieve and maintain electromagnetic (environmental) compatibility. Numerical simulations shall be applied to determine the electromagnetic field distribution inside and outside vehicles.
MethodsLiterature studies on V2X-technologies, identification and implementation of  suitable simulation methods for electromagnetic field analysis, implementation of vehicle models, verification tests of exposure to V2X and other radio technologies installed in vehicles.


4. Microwave and millimeter wave systems for modern satellite technologies

Active research staff: Dipl.-Ing. Uwe Stehr, Dipl.-Ing. Steffen Spira

Robust and accurate satellite navigation positioning is a key enabler for many fields of applications. In the research project ROSANNA, we investigate novel receiver systems for automotive and unmanned aerial applications. The new concept is based on distributed phase-synchronized sub-arrays, with a number of exciting challenges related to system design, receiver synchronization, and multi-standard antenna arrays. Our research partners are  DLR Institute for Communication and Navigation, RWTH Aachen, Antennentechnik Bad Blankenburg GmbH, and IMMS GmbH (subcontractor).


A second focus area addresses future trends on satellite communications, i.e., millimeter wave circuit design for various applications, including quantum key-based communications. Our main research partner is the Fraunhofer IOF in Jena under the roof of the Thuringian Center of Innovation Inquosens.

Topic 4.1Lumped-element LC-based bandpass filters for RF/ IF signal filtering of down-converted satellite signals
ObjectivesDesign, fabrication, and measurement of different bandpass filter topologies for given operational center frequency and bandwidth, optimization of key parameters (insertion loss, stopband attenuation, group delay)v
MethodsBandpass filter design according to a given specification, substrate layout using circuit design software (ADS), S-parameter simulations and measurements of fabricated samples, comparative analysis, circuit optimization


Topic 4.2Diplexing preamplifier-bandpass filter-module on FR4-substrate
ObjectivesDesign of a bandpass filter circuit for a multiband GNSS to separate the L1-band (1575 MHz) and E5a-band (1176 MHz), combination of an integrated low-noise pre-amplifier with two SAW bandpass filters. Optimization of key parameters (forward gain, input and output matching as well as noise figure)
MethodsMarket research of available LNA ICs; circuit design, simulation and optimization using Keysight ADS software; fabrication of sample circuits, coaxial S-parameter and noise figure measurements


Topic 4.3Discrete dual-band RF frontend module from COTS components
ObjectivesDesign of an analogue receiver and downconverter circuit for the GNNS L1- (1575.4 MHz) and E5a bands (1176 MHz) according to given specification using COTS components. Subsequent fabrication and verification by measurements.
MethodsDesign and layout with Keysight ADS software, S-parameter and noise figure measurements


Topic 4.4Microwave circuit design
ObjectivesDesign, simulation, processing and experimental characterisation of multi-functional microwave and millimetre-wave modules for satellite communications in LTCC technology
MethodsDesign compatible with technological constraints defined by LTCC technology, device including analogue parts and digital control interface, numerical circuit and full-wave simulations (e.g., ADS, HFSS), proof-of-principle through vector network analysis, S-parameter measurements, and comparison between simulated and measured data


Topic 4.5Versatile millimeter-wave frontends for 5G mobile communication systems
ObjectivesThermal analysis and optimization of a cooling-system for a hybrid-integrated mm-wave front-end for 5G communications in LTCC-technology
MethodsThermal FE modeling and simulation (ANSYS), experimental setup, measurements (e.g., infrared imaging), comparison between simulated and measured data