Open Theses
You may also contact one of our doctoral candidates directly, if you are interested in a Bachelor or Master thesis, a student job, an "Ingenieurspraxis" or a "Forschungspraxis". It often happens, that topics are being prepared which are not adverdised yet. It may also be possible to find a topic matching your specific interests.
Please include a curriculum vitae together with a list of attended courses when applying for a thesis.
If your "Ingenieurspraxis" is selected to be supervised by one of our professors, please hand in the documents to Doris Dorn (Room N2401).
Master/Diploma Theses
A Deterministic Approach to the Gaussian MultipleInput MultipleOutput (MIMO) Broadcast Channel  
Multiuser communication systems (such as wireless systems) are different than point to point channels in two key aspects; namely, the broadcast nature of transmissions (e.g., wireless transmissions can be picked up by any receiver in the vicinity of the transmitter) and the superposition (e.g., a wireless receiver picks up a linear combination of transmissions from all transmitters in its vicinity). Recently a deterministic approach to multiuser information theory has proved promising by achieving progress in some of the longstanding open problems by finding approximate solutions. The idea behind a deterministic approach, on a high level, is to focus on the interaction of signals rather than the background noise, through a simpler appropriate model; find exact solutions for the simpler model; and then translate the intuitions and techniques to new techniques and/or approximate solutions on noisy models. The goal of thesis is to undertake a deterministic approach to Gaussian MIMO broadcast channels. Prerequisite: Linear Algebra, Information Theory 

Supervisor: Shirin Saeedi 
Role of Feedback in Broadcasting  
This project intends to investigate the role of feedback in broadcast channels. More information available upon request.
Prerequisite (at least one of the following): Basic knowledge of Network Coding (see [2]) Basic knowledge of Algorithms Basic knowledge of Information Theory 

Supervisor: Shirin Saeedi 
Analysis of Backhauling Techniques for FullDuplex Communication Networks  
The thesis will investigate the backhauling techniques for a fullduplex communication network involving an LTE base station that connects the users to the backhaul through a satellite. For example, consider a set of users in a coach of a train that are connected to a basestation (LTE) located on the coach which has a link to the satellite. Such scenarios are of interest in providing data and voice communication in various transport systems and also to certain cases of disaster hit regions. The network can be modelled as a type of relay channel which admits a broadcast and multiaccess (MAC) components. The thesis involves modelling the informationtheoretic framework for the rate region of the network, a comparison with traditional halfduplex methods, and an extension to Gaussian and Ricean fading satellite channels. You should have a strong interest in information theory and digital communications, and you should be comfortable with MATLAB. Knowledge in satellite communications will be of benefit. The thesis is cosupervised by the DLR. 

Supervisor: Georg Böcherer, Dr. Mohit Thakur, DLR 
Powerline Communication for industrial application  
Powerline Communication (PLC) is a well established technology for inbuilding data transmission. The HomePlug standard provides an easy to use interface. PLC is charackterized by modulation and coding schemes which ensure robustness against impuslsive noise and disruptions by the power transmission and transformation. Hence, the PLc becomes an interesting approach for industrial applications such as power charging stations for electrical cars or in the field of smart grid. This Master thesis shoudl analyze the PLC technology on the basis of the HomePlug Greenphy standard and its realization in todays chipsets. In particular, the optimization of the given PLC realizations for industrial use will be the focus of this work. This MAster thesis will be done in cooperation with Siemens AG Corporate Technology.  
Supervisor: Elisabeth Oberleithner 
Open Student Jobs
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Theses in Progress
Bachelor Theses
Alexis GonzalezArgüello: Development of a Computer Implementation of Computational Methods for Timeharmonic Electromagnetic Field Modeling  
Supervisor: Gerhard Kramer, StellenboschUniversity, South Africa, Prof. M. Botha 
Ekin Alican Igdir: Cooperative Communication using Software Defined Radio  
Topic:
By using softwaredefined radio (SDR) equipments, the development of communication systems can be done totally in software. This allows quick prototyping of communication systems and testing them on real scenarios under real channel conditions. In our institute, we have SDR equipments that can be used for this purpose. The aim of this work is to build a communication systems to test and evaluate the performance of different relaying techniques. The tasks of the student can be listed as follows:


Supervisor: Onurcan İşcan 
Mahmoud Maryam ? Helmy: Erstellung einer App für Smartphones der BITS mobile ERP Linie auf Basis von IOS Plattformen  
Supervisor: Gerhard Kramer, BITS better it solutions GmbH, Wallenmahd 47, A6850 Dornbirn 
Firat Beytemür: Implementation of a ADSB Receiver  
Automatic dependent surveillancebroadcast (ADSB) is a technology in which an aircraft determines its position via satellite navigation and periodically broadcasts it, enabling it to be tracked. In this work, the student should understand the basics of this technology and implements a receiver to decode ADSB signals. ADSB signals are transmitted over a carrier at 1090MHz with a bandwith of about 50kHz. These signals can be easily received with the softwaredefined radio (SDR) equipment we have at our institute and can be processed with standard computer equipment. The tasks for this work can be summarized as follows:


Supervisor: Onurcan İşcan 
Alexander Jesipow: Durchführung von manuellen und automatisierten Testprozeduren mit ALEXA und AMIRA Filmkameras  
Supervisor: Fa. ARRI,München, Hr. O. Gonschorekt 
Arda Can Özensoy: How many cars can YOU park?  
Alfred Renyi wrote a curious paper in the late 1950s: He assumed an infinitely parking lane and placed cars, all equally long, randomly on this lane. He found out that you cannot even use 75% of the available parking space [1]! But I bet you can do better by a more realistic model: Assume cars are between 3 and 6 meters long, and assume that if a car arrives at the parking lane, it will take the first free parking slot (into which it fits). Cars arrive and leave randomly and independently. The first part of the Bachelor's project is to write a Matlab simulation and determine the efficiency of this parking scheme. Besides some knowledge in Matlab, for this task you should know a little bit about stochastic processes and random variables. The second part involves a literature survey, where you shall find out how this parking/packing problem connects with communications engineering (e.g., code design, communication networks, etc.). [1]: Renyi's Parking Constant on Wolfram Mathworld (with illustration) 

Supervisor: Bernhard Geiger 
Hiba Arnout: Implementation of an Efficient Lumping Algorithm  
In 2003, Derisavi, Hermanns, and Sanders proposed an efficient algorithm to detect the coarsest partition of the state space, w.r.t. which a given Markov chain is lumpable. The algorithm is based on splitting a set of states which violates the conditions for lumpability into sets which satisfy them; it is shown to have a computational complexity of O(m log n), where n is the number of states of the Markov chain and m the number of transitions (i.e., the number of nonzero entries of its transition probabilities matrix). The task of the project is to implement this algorithm in a modular way, such that the condition for lumpability can be exchanged by either informationtheoretic criteria or by criteria for quasilumpability. Finally, a series of experiments should verify the functionality of the algorithm and assess whether a this splitting method can effectively detect a quasilumpable partition. 

Supervisor: Bernhard Geiger 
Master/Diploma Theses
Martinez Laura Pastor: SDR based experimental setup for evaluating system performance with QAM and differential PSK  
The purpose of this thesis is the application of Software Defined Radio (SDR) as an experimental environment for investigating the performance of various modulation schmemes. Besides, this work should provide an insight into the possibilities SDR offers and its application, not only in an educational but also in the research context.  
Supervisor: Elisabeth Oberleithner 
Tobias Fülle: Preamble Recognition on NCOFDM for Dynamic Synchronization  
Within a public subsidized research project called COUWBAT, the student will develop a combined ultrawide band and cognitive radio HWTransceiver to increase the spectrum efficiency and data rates through the utilization of the socalled white spaces for secondary users. Therefore, the NCOFDM method will be applied to switch certain subcarriers on and off. Later on, evaluation of FilterBank Multicarrier (FBMC) is aimed to take place.  
Supervisor: Onur Günlü, M. Sc. Manuel Sáez Rodríguez (AED Engineering) 
Jonas Eichler: Device To Device Communication in LTE Mobilfunksystemen  
Device to Device (D2D) Kommunikation wird momentan in der Version 12 (Release 12) von LTE spezifiziert. Im Rahmen Ihrer Abschlussarbeit fertigen Sie Studien über die Standardisierung von D2D an und erarbeiten ein Modell des Physical Layers. Besonderer Augenmerk soll hierbei auf die Aspekte der Discovery Prozedur sowie auf die D2D Datenkommunikation gelegt werden. Ihre Studien und Implementationen, welche hauptsächlich in MATLAB erfolgen, werden dann zur Implementation und Verifikation unseres User Equipment Testsystems genutzt. Sie arbeiten während Ihrer Arbeit innerhalb des bestehenden Projektteams für die LTE Implementierung mit. Eine gute und verständliche Implementation der Modelle ist deswegen ebenso erforderlich wie eine einwandfreie Dokumentation.  
Supervisor: Stefan Dierks, Dr. Moritz Harteneck (Rohde & Schwarz) 
Zhaoqi Zhu: Preamblebased Channel Estimation in Coherent Spatial Division Multiplexing OFDM Transmission System  
The robustness of the channel estimation is a key for coherent spatial division multiplexing OFDM transmission system. Timemultiplex(TM) preamble structure has been widely adopted in the polarisation division multiplexing OFDM transmission and in the scenario of spatial division multiplexing OFDM transmission supporting 3 spatial modes. When scaling to higher number of spatial modes, the TM based channel estimation introduces huge overhead and is sensitive to laser phase noise. Therefore, subcarrierorthogonal(SO) preamble structure is a potential candidate for channel estimation. In this work, the TM and SO preamblebased channel estimation will be investigated under the influence of laser phase noise, modedependent loss and strong/weak coupling regime of the few mode fiber.  
Supervisor: Yingkan Chen 
Stefan Thiel: Analysis of AM Demodulation in Speechbased Airborne Communications Under Multipath Propagation  
This master thesis is in cooperation with the radio communications department at Rohde&Schwarz. Airborne radio communication is based on Amplitude Modulation (AM). To use them with existing lowdirectivity antennas in airplanes, the effects of multipath propagation have to be considered. The student will investigate the channel effects on airborne communications (GroundAir, AirAir) and compare possible receiver designs. For this aim, realistic multipathpropagation scenarios will be defined for airborne communications. The models and the suggested designs will be tested with Matlab/Simulink. The student will evaluate the results and compare multiple techniques to improve communication quality.  
Supervisor: Onur Günlü, Dipl.Ing. Ludger Korsmeier and Dipl.Ing. Michael Gerth (Rohde&Schwarz) 
Li Chen: Aggregation Methods for Markov Chains  
The purpose of this thesis is to investigate state space aggregation methods using informationtheoretic cost function. The main cost functions investigated shall be the I(Y_1;Y_2) and H(Y_2Y_1)  H(Y_2X_1). The former, which should be maximized, is related to informationtheoretic clustering and to near complete decomposability of Markov chains. The latter, which should be minimized, is related to lumpability, the phenomenon of a function of a Markov chain being Markov. Both cost functions should be optimized over all possible partitions of the state space, which is a combinatorial problem. In order to reduce the computational complexity of the search, suboptimal aggregation methods shall be adopted from the literature: Agglomerative, sequential, or splitting methods shall be investigated. Furthermore, it is interesting to see if a relaxation of the cost functions admits the application of established algorithms, like the information bottleneck method. The aggregation methods shall be evaluated at the hand of a few examples, e.g., quasilumpable and nearly completely decomposable Markov chains, examples from natural language processing or synthetic biology, and the Ehrenfest diffusion model. 

Supervisor: Bernhard Geiger 
QIPING SHAO: OFDM and FBMC  
Supervisor: Patrick Schulte 
Ingenieurspraxis
Robert Fellendorf: Untersuchung der HFParameter für die Eignung zum Einsatz in IMMessgeräten  
Supervisor: Gerhard Kramer, Fa. Rosenberger, Hochfrequenztechnik GmbH & Co. KG, 83413 Fridolfing 
Dominik Fienko: Integration BS2000 SE Serie in Enterprise System Management  
Supervisor: Gerhard Kramer, Fa. Fujitsu Technology Solutions, PDG ES S SWE 057, München 
Daniel Klimsa: Integrated Spare Part Identification and Ordering  
Supervisor: Norbert Hanik, Siemens AG, Dr. Blume 
Ömer Tan: Zusammenstellen einer Messtechnikapplikation aus Standard HW/SWKomponenten  
Supervisor: Gerhard Kramer, BMW Group München, Hr. E. Zerlach 
Martina Kiechle: Entwicklung eines Kapazitätsplanungstools und Erstellung einer SharePoint 2013 ShowCase Plattform  
Supervisor: Gerhard Kramer, Siemens AG, München, Hr. C. Riedelbauch 
Tamara Fiedler: Planung und Umsetzung von innovativen ARApps für alle BSHMarken  
Supervisor: Gerhard Kramer, Fa. BSH Bosch u. Siemens Hausgeräte GmbH, München, Hr. Clemens 
Michael Koller: Integration von Referenzkurven in eine Messung eines Broadcast Signal Analyzers  
Supervisor: Gerhard Kramer, Fa. Rohde & Schwarz GmbH & Co. KG, München 
Mohamed Salah Ben Slimen : SDR  Digital Modulation Real Time Receiver in Simulink  
Software Defined Radio is a relatively new concept in thinking and designing communications systems. What defines it is that almost all parts of a transciever (transmitter/receiver) are implemented as software modules on a general purpose computer, rather than on dedicated hardware. The radio frequency part of the receiver is thus also reconfigurable through software and will represent just an interface. Simulink is a graphical programming tool from Mathworks and is especially good for fast prototyping and simulating of complex systems. It provides many custom made software modules and light and easy way to set up graphical user interfaces. The purpose of this project is that following the principles of SDR radio and the facilities offered by Matlab/Simulink you could build a realtime receiver for DAB. DAB (Digital Audio Broadcasting) is a digital radio communication standard for broadcasting radio stations intended to replace the old fashioned AM and FM radio systems. Links:http://en.wikipedia.org/wiki/Softwaredefined_radio http://en.wikipedia.org/wiki/Digital_Audio_Broadcasting http://de.mathworks.com/products/simulink/ 

Supervisor: Andrei Nedelcu 
Nawel Attia: Nonlinear Error Correction Codes for Erasure Channels: Sudoku  
Supervisor: Patrick Schulte, Bernhard Geiger 
Forschungspraxis (12 ECTS)
Tobias Schneider: Distributed ReedSolomon and Gabidulin Codes  
Supervisor: Hannes Bartz 
Andreas Lang: Implementing the SplitStep Fourier Method  
The Nonlinear Schrödinger Equation (NLSE) is a nonlinear partial differential equation that describes the propagation of light in a nonlinear optical fiber. Since there is no closedform solution to the NLSE, numerical methods are used to approximately solve it. The most popular among these methods is the splitstep Fourier method (SSFM). The student’s task in this Forschungspraxis/Ingenieurspraxis is to implement the SSFM in MatlabEnabled C (mex) with CUDA support.  
Supervisor: Tobias Fehenberger 
Yuchen Wu: Using Information Theory to Quantify Sudoku Difficulty  
Sudoku games come in many difficulties; those with many clues are in general easier to solve than those with few clues. But is this a rule without exception? Or are there Sudokus with, say, 40 clues which are more complicated to solve than some Sudokus with 35 clues? If this is true, the number of clues is not a good measure of difficulty. Many other difficulty metrics depend on the runtime of a given solver, and hence depend on the implementation or the solving algorithm. In this Forschungspraxis, the following assumption is made: Sudokus are easy to solve if the clues are highly redundant. And redundancy can be measured (or estimated) using information theory (see [1] and the references therein). There are already first attempts at informationtheoretic difficulty ratings [2], and recently Sudoku puzzles have been considered as a method of coding for erasure channels [3]. The goal of this Forschungspraxis is to survey the existing literature, implement an informationtheoretic difficulty rating and compare it to other, existing algorithmbased difficulty ratings. In the ideal case you will even find a new method to rate Sudokus, or you might discover a strong connection between difficulty ratings and parameters of Sudoku codes. In any case, this is a Forschungspraxis you can talk about at a student's party! [1]: Griffith and Ho, "Quantifying Redundant Information in Predicting a Target Random Variable" [2]: When Sudoku come across Information Theory [3]: Atkins and Sayir, "Density Evolution for SUDOKU codes on the Erasure Channel" 

Supervisor: Bernhard Geiger, Ali Amjad 
Mustafa Cemil Coşkun: Staircase Codes for Optical Communications  
Staircase codes are a relatively new class of algebraic channel codes for highspeed optical communications. Their large coding gains and reasonable decoding complexity have made them a promising option for data rates of 100 Gbit/s and more. The student's task of this Forschungspraxis is to understand the concept of staircase codes and implement them in Matlab or C.  
Supervisor: Tobias Fehenberger, Georg Böcherer 
MSCE Internships
Mu He: Link Adaptation Improvement for B4G  
As an advanced version of LTE, B4G provides several new features. One of them is link adaptation based on measured instantaneous SINR which is used for selecting MCS and rank of transmission to generate the best throughput. In addition, depending on the scheduler, SINR may be used to determined which users are scheduled for a certain transmission time interval and on which frequency resources. The measured SINR can be inaccurate due to measurement errors, rounding errors due to quantization of the SINR values, and delay from time of measurement until the actual data transmissions. To compensate for SINR inaccuracies, the SINR can be adjusted by a certain offset before being used for link adaptation and scheduling. This offset value, in our implementation, is adaptively adjusted for each user based on an algorithm via a feedback loop, referred to as Outer Link Loop Adaptation (OLLA). My work is trying to raise the system performance of the simulation for B4G downlink and uplink by improving the adaptation behavior. 

Supervisor: Gerhard Kramer, Dr. Volker Pauli, NOMOR Research 