Persönlicher Status und Werkzeuge

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).

Bachelor Theses


Implementation of a General Purpose LDPC Encoder
In the beginning of the thesis, the student will perform a literature research on existing general purpose LDPC encoding strategies and find out which variants are used in practical implementations in standards (Wifi, CCSDS, etc.). Next, the student will focus on the implementation of a scheme as described by the authors of [1]. As a programming language, we will target both C and Matlab. [1] T. J. Richardson and R. L. Urbanke, “Efficient encoding of low-density parity-check codes,” IEEE Trans. Inf. Theory, vol. 47, no. 2, pp. 638–656, Feb. 2001.
Supervisor: Fabian Steiner

Development and Implementation of an Algorithm for a Bandwidth-Optimized Transmission of "Start-Over" media via Satellites.
Supervisor: Fabian Steiner, Firma SES/MX1

LDPC Decoder implementation on FPGA
Feasible decoding complexity is a major criteria for any decoding algorithm. LDPC Codes have linear decoding complexity, which makes them interesting for various applications. The aim of this bachelor thesis is to implement one specific LDPC Code on hardware starting from a software implementation.
Week 1: get familiar with LDPC Codes
Week 2: implement LDPC decoder in software
Week 3-8: implement LDPC decoder on FPGA
Week 8-9: write your thesis

Requirements: some experience with FPGAs
Supervisor: Peihong Yuan, Patrick Schulte, Georg Böcherer

Master Theses


A Deterministic Approach to the Gaussian Multiple-Input Multiple-Output (MIMO) Broadcast Channel
Multi-user 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 multi-user information theory has proved promising by achieving progress in some of the long-standing 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. Pre-requisite (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

Code and Algorithm Design for Physical-layer Security

We are looking for motivated students to work on algorithm and code design for privacy and security applications. For realistic channel models, we want to implement a set of codes and algorithms to analyse their complexity, reliability, privacy, and secrecy performance.

Pre-requisites: Information theory, one of the Channel Coding lectures given by LNT

Supervisor: Onur Günlü

Error Correcting Codes for Insertion/Deletion Errors
The discussion of synchronization errors, like insertions and deletions of symbols into codewords goes back to the early 1960's. Still, little is known about these kinds of errors and basic questions, like the capacity of the binary deletion channel remain unsolved. This stems from the fact that errors in the insertion/deletion metric are fundamentally different from the well-researched substitution errors and conventional error correcting codes cannot be applied on these kinds of errors. Current research, and the topic of this Master thesis, is directed towards finding the minimum redundancy of such codes and developing constructions that can correct insertion and deletion errors.

Prerequisites: You should have good knowledge in linear Algebra and interest in channel coding.
Supervisor: Andreas Lenz

FPGA Simulation of Improved Staircase Codes

Staircase codes, as introduced in 2011 by Smith et. al. [1], are a hardware friendly code design for error correction in optical communication systems. However, the choices of parameters such as block size and code rate are limited by the performance of the decoder. A new and improved decoder has been devised [tbp], allowing for staircase codes with a scope of new parameters to be considered for optical communication. While estimations show the significant improvements, the high throughput required to simulate the error floor did not allow for simulations to be conducted in software. The goal of the thesis is the implementation and simulation of the new decoder on a FPGA in order to provide further evidence for the estimated performance.

Prerequisites: interest in channel coding, knowledge in VHDL

[1] https://arxiv.org/abs/1201.4106

Supervisor: Lukas Holzbaur

Application of Machine Learning in Wireless Communications
See here thesis_TUM_ML.pdf.
Supervisor: Georg Böcherer, Prof. David Gesbert, Paul de Kerret

Fundamental Outerbounds of Wireless Communications with Imperfect Channel State Information at the Transmitter
See here thesis_TUM_IT.pdf.
Supervisor: Georg Böcherer, Prof. David Gesbert, Paul de Kerret

Designing codes for secret key generation and extracting the secret bits in left over hash lemma
The source model of secret key generation deals with the idea of Alice and Bob generating a key in a distributed manner from correlated observations. This key must be kept secret from an evesdropper. In this internship/thesis the student will start by looking at a simpler model which corresponds to the left over hash lemma. The student will build on some preliminary work done by me to design codes for the extraction of left over hash in a simple setting. After this the student will extend the work to design codes for distributed secret key generation for the source model.
Supervisor: Rana Ali Amjad

MIMO Multiport Communications
The topic of the thesis is to develop a simulator for MIMO communications including the transmit and receive RF frontends of a single user link. The simulator should be able to support different types of antenna elements and array configurations as well as matching circuits and amplifier models. In addition it should be able to estimate rates of communication over deterministic and stochastic channels.
Supervisor: Andrei Nedelcu

Rate-Distortion Theory for Sparse Sources
Rate-Distortion Theory for Sparse Sources This project investigates information theory limits for the lossy compression of sparse sources. Motivated by the recent mathematical theory Compressed Sensing that deals with the efficient acquisition and reconstruction of sparse signals, we try to determine the fundamental limits of digitally storing data created by such sources. A sparse source emits a string of symbols of which - loosely speaking - only a few contain information. There are different ways to model these sources. An example is the Gaussian spike source which emits a Gaussian symbol with probability p and a zero with probability 1-p.

Possible directions of a project are:
- Investigating different source models
- (Numerically) determining the rate distortion function of a sparse source
- Computing finite length performance bounds for sparse sources

Prerequisites:
- Information Theory (must)
- Pleasure with mathematics (must)
- Multiuser information theory (beneficial)
Supervisor: Lars Palzer

Forschungspraxis or MSCE Internships


Code design for Physical Layer Security
Wiretap channel represents the basic setup for physical layer security. It has been extensively studied in the last four decades and the fundamental limits of communication for this channel are known in a wide variety of scenarios. Nevertheless the only explicit code construction that can achieve wiretap secrecy capacity uses Polar codes. Designing codes for secrecy involve the combined design of codes for reliability and channel resolvability. In 2015 a new coding scheme for channel resolvability was introduced by Amjad and Kramer. The aim of this internship is to combine this channel resolvability code with existing channel codes in order to design wiretap code.
Supervisor: Rana Ali Amjad

Vector Network Coding Based on Rank-Metric Codes
Supervisor: Antonia Wachter-Zeh

Characterization of the effect of filtering on Four Wave Mixing
The nonlinearity of the fiber optic channel produces several frequency mixing effects, namely Cross Phase Modulation (XPM) and Four Wave Mixing (FWM). The repeated use of filters along the fiber reduces these effects, and improves channel isolation. In this thesis, we aim to find a way to characterize the FWM interference, and to find out how much of it is removed by the filters.
Supervisor: Francisco Javier Garcia Gomez

Code Design for Secret Key Generation/ Left over Hash Lemma
The source model of secret key generation deals with the idea of Alice and Bob generating a key in a distributed manner from correlated observations. This key must be kept secret from an evesdropper. In this internship/thesis the student will start by looking at a simpler model which corresponds to the left over hash lemma. The student will build on some preliminary work done by me to design codes for the extraction of left over hash in a simple setting. After this the student will (if time permits) extend the work to design codes for simple cases of distributed secret key generation for the source model.
Supervisor: Rana Ali Amjad

Open Student Jobs

no news in this list.


Theses in Progress

Bachelor Theses


Mohamed Ben Chikha: Lossy Source Coding Performance of Low-Complexity Compressive Sensing
The subject of this Bachelor’s thesis is the performance analysis of recent one-bit com- pressive sensing (CS) algorithms in a lossy source coding framework. Based on the seminal works of Donoho as well as Cand ́es and Tao that deal with the efficient linear encoding of a sparse real-valued vector into a real-valued vector of smaller dimension, Boufounos and Baraniuk [1] proposed a one-bit CS algorithm where each linear measurement is quantized to +1 or -1. From these binary measurements, the original signal can then be approximated using various optimization techniques. A major drawback of simple sign measurements is that the quantization error decreases only inversely proportional to the number of bits, as opposed to an exponential decay with optimal vector quantization.
To overcome this limitation, Boufounos proposed the usage of discontiguous scalar quantization regions while still keeping a single bit per measurement. In [2], it is shown that the quantization error can indeed decrease exponentially in the number of mea- surements. A possible decoding structure for this method is Generalized Approximate Message Passing, which is used in [3] and indicates that good performance is achievable in practice.
In lossy compression, the performance of a quantization code is usually measured with respect to its average distortion (the average quantization error) or excess distortion, that is, the probability of exceeding a given quantization error. Recently, there has been significant progress in finding the fundamental limits for the excess-distortion performance of fixed length vector quantizers, see [4, 5] and the references. These results can be seen as benchmarks for the performance of practical algorithms.
The aim of this thesis is thus to implement one-bit CS algorithms based on discontiguous scalar quantization and investigate their lossy source coding performance.

[1] P. T. Boufounos and R. G. Baraniuk, “1-bit compressive sensing,” in 42nd Annual Conference on Information Sciences and Systems (CISS), pp. 16–21, March 2008.
[2] P. T. Boufounos, “Universal rate-efficient scalar quantization,” IEEE Trans. Inf. Theory, vol. 58, pp. 1861 – 1872, Mar 2012.
[3] U. S. Kamilov, V. K. Goyal, and S. Rangan, “Message-passing de-quantization with applications to compressed sensing,” IEEE Trans. Sig. Proc., vol. 60, pp. 6270 – 6281, Dec 2012.
[4] V. Kostina and S. Verdu ́, “Fixed-length lossy compression in the finite blocklength regime,” IEEE Trans. Inf. Theory, vol. 58, pp. 3309 – 3338, June 2012.
[5] L. Palzer, R. Timo, and G. Kramer, “Compression for letter-based fidelity measures,” preprint, Jan 2016.
[6] http://dsp.rice.edu/1bitCS/.
Supervisor: Lars Palzer

Alberto Diago Gallardo : Atmospheric Influence on Free Space Optical Communications
The work is based on Free Space Optical (FSO) communications and will include the following parts: • Case Study: Ground-to-Ground laser Links: o Link budget calculations; (Done) o Tracking Power budget calculations; o Scintillation analysis (optional: atmospheric simulations and fade statistics); (Ongoing) o Atmospheric Attenuation: Link availability calculations. (Ongoing) • Support the design, integration of testing of the “Frame-Steering Concept” as a demonstrator terminal for static links. (Ongoing) • Outdoor link demonstration and measurement campaign. • Analysis and evaluation of the measurement data.
Supervisor: Norbert Hanik, Luis Martin Navajas

Mohamed Selmane: Schedule Analysis for LDPC Codes
The Student should compare different scheduling Strategies for LDPC codes. This includes comparing the number of iterations needed to decode and the possibility to build efficient designs in hardware.
Supervisor: Patrick Schulte

Alyssa Akremi: Reduced complex precoding for CoMP massive MIMO sparse Channels
In this thesis, we investigate the low complex algorithms applicable to Zero-Forcing process of Coordinated Multi Point (CoMP) sparse channel matrices
Supervisor: Amir Ahmadian

Houssem Amami: Inter-channel interference in optical narrow-band multi-channel systems with distributed filters
The nonlinear nature of the fiber optic channel produces frequency mixing and the appearance of spurious frequencies. Careful design of the fiber can mitigate this effect by removing the spurious components, but there is still residual interference between channels in multi-channel systems. In this thesis, narrow-band channels are considered, and the nature of the residual interference is explored.
Supervisor: Francisco Javier Garcia Gomez

Sirine Ammar: Community Detection in Dramatic Plays
We are given the scene configuration of a dramatic play in the form of a matrix that links characters to scenes. A matrix entry is 1 if the corresponding character is present in the corresponding scene and 0 otherwise. Based on this matrix and on the generalized formulation of information-theoretic co-clustering by Clemens Blöchl, we want to cluster characters into meaningful groups and compare the results with those obtained from text analysis.
Supervisor: Bernhard Geiger, Rana Ali Amjad

Rouven Fischer: Investigation into control concepts of modern industrial automation
Supervisor: Norbert Hanik

Wael Touzri: Energy conservation in periodically filtered fiber optic channels
The nonlinearity of the fiber optic channel causes spectral broadening, which results in loss of energy in the band of interest. This degrades the communication even in single-channel systems.. In this thesis, we consider a fiber optic channel with bandpass filters every few kilometers, and try to characterize the loss of energy as a function of the filter spacing.
Supervisor: Francisco Javier Garcia Gomez

Fares Charfi: Transform Selection for Secret-key Storage with Physical Identifiers

Binding secret keys to physical identifiers (e.g., physical unclonable functions) is a secure and cheap alternative to storing a key in a non-volatile memory to provide security to Internet of Things (IoT) applications. Key-binding schemes require an information reconciliation step due to the noisy nature of physical outputs.

The student will start with a literature review about the computational and hardware complexity of standard transforms. Later, the results of the first part will be used to improve the transform-coding algorithm that binds secret keys to physical identifiers, proposed by Günlü et al., so that one can use simpler low-complexity channel codes for error correction. Student will also implement the complete key-binding algorithm by using the improved transform-coding steps.

Supervisor: Onur Günlü, Karl-Tasnad Kernetzky

Mohamed Ibn Haj Hmida: Transform Optimization for Secret-key Generation from Correlated Physical Outputs

The main aim of the thesis is to find useful methods available in the literature to solve an optimization problem that gives the optimal transform for our security and privacy algorithm.

In the first part of the thesis, the student should get familiar with the basics of physical unclonable functions (PUFs) and the transform-coding algorithm proposed by us. With this background, the optimization problem to be solved for our specific security application will be accurately defined by the student with some guidance.

The student will later study different methods in the literature used for solving a certain class of optimization problems and if possible decide which methods are the best for us. The student will also attempt to (partially) solve the problem. Final part of the thesis will include MATLAB simulations with different transform and mapping options for comparison.

Supervisor: Onur Günlü, Bernhard Geiger

Master Theses


Mustafa Cemil Coskun: Successive Cancellation Decoding of Product Codes
Product codes were introduced by Peter Elias in 1954. He showed that the bit error probability can be made arbitrarily small by constructing a multidimensional product code with a positive code rate although it was far below the capacity limit. After almost half a decade, Erdal Arıkan has come with a channel code, which is provably capacity-achieving under successive cancellation decoding as block length tends to infinity.
The construction of both codes shows many similarities, which can be exploited. The thesis will investigate these similarities between two classes of codes and, in particular, it will borrow some tools from polar code setting and apply to product codes, e.g. successive cancellation decoder. After finding some theoretical results, the work will be concluded by implementing a simulator for product codes to show whether the findings are accurate or not.
Supervisor: Dr. Gianluigi Liva (DLR)

Dhanush Krishna: Development of a variable data rate transceiver for real-time operation in Free-Space Optical communications systems
RF-based technologies are extensively used for wireless communication systems because of its multiple advantages such as the absence of wiring infrastructure and there inherent flexibility to integrate Ad-hoc networks. However, the free radio-electric spectrum for communications is decreasing due to the constant increase of bandwidth demand and services. In order to solve this problem aerospace industry is assessing the possibility of using Free-Space Optical (FSO) communications as an alternative solution. The main advantages of such systems are potential higher data rates (several Gigabits per second), small communication devices, tap-proofness and license free spectrum bands. Unfortunately, FSO systems are sensible to atmospheric perturbations, i.e. fog, clouds, rain, that attenuate the signal and thus lead to fades at the receiver. Additionally, mobile applications suffer from fades caused by atmosphere and imperfect pointing and tracking systems. For all the above mentioned reasons, Deutsches Zentrum für Luft- und Raumfahrt (DLR) Institute of Communications and Navigation is designing and developing a FSO communication transceiver for aeronautical applications using commercial FPGAs. This transceiver, Laser Ethernet transceiver (LET), acts as a media converter between Ethernet frames and proprietary LET frames for FSO. It features novel fading-robust communication protocols combined with error correction schemes to allow error free transmission through the atmosphere. High rate codes and long interleavers can be used to cope against such fades and thus the system has to be designed for bad channel condition. However, it is waste of resources when the channel is good. Therefore, an intelligent way to optimize resources is to vary the data rate of the system according to the channel condition. As part of this initiative, the main objectives of this Master’s Thesis are first to study and analyze the different methodologies to perform variations in the line data rate. Second, to develop, test and verify the necessary RTL structures in VHDL for implementing a reliable, automatic system capable of switching between different data rates up to 10Gbps. This RTL structures will be integrated into an existing LET system thus it will have to communicate with existing parts of the design which constitutes the starting point of this Master’s Thesis. As secondary objectives, a minimization of third party development resources is desirable and will be carried out in close collaboration with hardware designers. In addition, all the work development shall be oriented to fulfil the requirements for the qualification process. This implies that both internal and external documentation of the project shall be provided. Block Diagram and how VarDR relates Channel Estimation: The earlier topic which was the real-time channel estimator, we needed to evaluate the different channel conditions taking into consideration system loss, geometric loss, misalignment loss, atmospheric loss, atmospheric turbulence induced fading, and ambient noise. By taking into account each of the losses that are present in a real-time channel, we needed to evaluate what kind off loss reduction mechanism could be employed. Since we need to even take care that the design components shouldn’t be redundant as there could be cases wherein all the loss prevention mechanisms won’t be applied at the same time. Whereas the main objective of the former topic was to analyze and to estimate the current conditions of an optical link, this new thesis focuses into the understanding and development of techniques which allow the system to adapt itself to the changing channel situation. As seen from the diagram, we see that the Variable Data-Rate transceiver Block is included. We also observe that Channel Estimation Block runs in parallel with the Variable Data-Rate Transceiver. Now the question would be the use of this variable data transceiver. It is not always feasible to transmit the data at the same rate for all the atmospheric conditions. For Ex: In case of Foggy climate it is feasible to transmit the data at lower rate whereas in case of the clear sky, higher rates can be used. Taking into account the output from the Channel Estimator, different data rates can be used to transmit the data and this variable data rate is adapted across all the components in the design. In general, the real time channel state information (CSI) is considered and the data rate across the transceivers are modified. After analyzing, the implementation is carried out on the FPGA providing the control signals for different channel conditions which then determines the data rate.
Supervisor: Norbert Hanik, Jorge Pacheco (DLR, Oberpfaffenhofen)

Keykavoos Afghahi: Methods for Adaptive Channel Allocation in a Multi-cell System
Supervisor: Markus Staudacher, Neda Petreska (Frauenhofer ESK)

Daniel Sander: Development of a measurement device for characterization of the signal quality in optical satellite-to-ground communications
The Institute of Communications and Navigation develops new systems and algorithms for optical communications with satellites and aircraft. The atmosphere significantly degrades signal quality, which can be seen in phase and intensity distortions as well as signal blockage by clouds. The institute operates an optical ground station to characterize these distortions and conducts measurement campaigns with satellites and aircraft. The new measurement device shall be designed to be directly attached aside the main receiver reflector of a ground station. The measurement device shall be independent from the receiver reflector e.g. the optical telescope but shall use the same tracking mount. The prime application will be the characterization of channel impairments at existing ground station sites worldwide, either of optical or RF type. This drives the requirement that the measurement device must be weatherproof taking into account typical climate conditions at ground station sites and it shall be of a small form factor (2” system). To ensure simple and continuous operations it must be able to be operated autonomously. In this work, this measurement device for signal quality shall be designed, assembled and tested. The design shall consider boundary conditions given by possible installations on an optical or RF receive antenna system as well as availability of possible signals sources in space. This includes analysis of characteristics of different antenna types (optical/RF), recommendations given by standardization activities regarding the space-to-ground link and expected dynamics and signal levels from potential test sources.
Supervisor: Norbert Hanik, Dirk Giggenbach / Florian Moll / Hennes Henniger

Kairen Liu: Information Theoretic Analysis of Neural Networks
Various types of neural networks have gained a lot of attention in recent years and have found numerous practical applications with impressive results. Albeit their success, their behaviour is not very well understood mathematically. The aim of this thesis is to approach the topic from an information theoretic perspective and see if one can use insight from information and coding theory to analyze/design neural networks for specific applications.
Supervisor: Rana Ali Amjad, Bernhard Geiger

Zafzouf Ghassen: Investigation into signal wave-forms for 5G & information theoretic analysis of MIMO OFDM systems
5G communication systems aim to put a large range of devices onto a network, ranging from high bandwidth systems which can transfer video and large files to small devices which only sporadically send data. Similarly the devices may be battery powered or not. The problem that can exist is that many modern communication systems are based on OFDM modulation which when used by multiple users simultaneously can have problems with synchronization, bit resolution, and the need to achieve good channel estimation. Our goal will be to characterize the fundamental information theoretic limits of such communication systems,as well as to design practical communication schemes that can approach these limits. This project will look into MIMO OFDM systems with a view to improve them towards being suitable for 5G communication systems.
Supervisor: Markus Staudacher

Qionghui Cao: Partial Parallel LDPC Decoder implementation on FPGA
Supervisor: Peihong Yuan

Jianwei Zhang: Probabilistic Signal Shaping for Short-Reach Optical Fiber Systems
Optical fiber systems form the backbone of the internet. Despite their large usable bandwidth, they are going to running out of capacity due to an increasing demand for services such as high-definition video streaming. In order to obtain the largest possible transmission rates for a fixed link, a shaped input should replace the common uniform input. In particular, non-iid inputs lead to less fiber nonlinearities, which improves the system performance. This Master thesis investigates such temporally correlated fiber inputs.
Supervisor: Tobias Fehenberger

Niklas Jünger: Error Correction for Data Storage in DNA
Supervisor: Andreas Lenz

David Ginthör: Development of a packet level encoding scheme and network protocol for a Hybrid-FSO/RF-Link
The Institute of Communication and Navigation of DLR developed a high rate Free Space Optical (FSO) downlink from an airborne to a ground station. However, it suffers from limited availability, as weather and atmospheric conditions significantly influence the signal link. Furthermore, the optical link is unidirectional and thus does not allow any flow-control. For operational purposes, the system also includes a bidirectional RF link. The objective of the Master’s Thesis is to develop a hybrid system that utilizes both transmission technologies – FSO and RF – to exploit the advantages of each. We will study how to increase performance of the unidirectional optical link by utilizing the bidirectional RF link to establish flow-control. Additionally, a switching algorithm shall be developed, which ensures uninterrupted data transmission in cases where only individual links are usable in order to maximize link availability and thus throughput of the system. This involves designing a protocol, which allows transmission over both links depending on the state of the channel. Information of the optical channel is acquired by analyzing statistics of the connection derived from the received data at the optical terminal. The software development includes analyzing and finding suitable transport protocols and focuses on efficient low-level programming in order to achieve high data rates of up to 10Gbit/s. Further, we will investigate a data-encoding scheme on the application layer to find possible solutions to increase reliability of packet integrity and hence robustness to packet losses over the optical link. The main challenge will be handling high data rates without the possibility to employ any sort of acknowledgment due to the lack of an uplink in the FSO.
Supervisor: Norbert Hanik, Dr. Julio Ramirez, DLR

Michael Reinsch: Messung und Validierung von Latenzzeiten von sicherheitsrelevanten Funktionen im Realfahrzeug und am Pruefstand.
In dieser Masterarbeit werden Latenzzeitmessungen sicherheitsrelevanter Funktionen der Längsdynamik „Abstandsregeltempomat“ und „Notbremsassistent“, sowie der aktiven Sicherheit „Auffahrwarnung“, von Kraftfahrzeugen durchgeführt. Zu Beginn werden die für die Funktionen relevanten Anforderungen und Wirkketten analysiert. Eine Wirkkette ist aus Steuergeräten, Sensoren, Aktoren und Datenbussen zusammengesetzt. Das Architekturmodell wird um Latenzzeitanforderungen ergänzt, sodass ein Sollmodell der Funktionen hinsichtlich Latenzen entsteht. Anschließend wird ein Konzept eines Messaufbaus erstellt, in dem die in der Architektur relevanten Meßpunkte definiert werden. Die benötigte und zur Verfügung stehende Messtechnik wird analysiert. Daraufhin werden Messungen am Hardware-in-the-Loop-Prüfstand sowie am Realfahrzeug durchgeführt. Die Meßergebnisse werden mit dem Sollmodell evaluiert.
Supervisor: Norbert Hanik, Sebastian Vöst, M.Sc., BMW Group

Ingenieurspraxis


Mahmoud Marcam 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, A-6850 Dornbirn

Lukas Püttner: Evaluierung verschiedener Tools zur Extraktion und Auswertung von Metadaten aus IP-Verkehrsdaten
Supervisor: Norbert Hanik, ESG Elektroniksystem- und Logistik GmbH, 82256 Fürstenfeldbruck

Francesco Montanari: Dynamic Dead Pixel Correction
Supervisor: Norbert Hanik, Fa. ARRI, Arnold & Richter Cine Technik GmbH & Co KG, München, Fr. E. Kögel

Barbara Lenz: Durchführung/Auswertung von RCS-Messungen
Supervisor: Gerhard Kramer, MBDA Deutschland GmbH, Schrobenhausen

Abidi Helmi : Programmierung einer C-basierten Ansteuerung für ein 1HE-Rack kompatibles TFT Display samt Touchpad
Supervisor: Gerhard Kramer, Attocube Systems AG, 80539 München

Ahmed Khalil Ben Mohamed: Porting Quiz Exercises and Flash animations of the lntWWW to Modern Formats
The LNTwww is based on a custom content management system. Some learning examples are provided as Flash animations which are not supported on many current platforms, e.g. iOS, and will likely not be supported in the future at all. The task is to port the Flash animations to modern a format to make the content accessible for as many students and platforms as possible. Therefore, the student will have to find and evaluate alternatives like e.g. HTML5. The student should also be able to have a good understanding of technologies used for web sites. Moreover, the student's task is also porting Quiz exercises into the new wiki system.
Supervisor: Karl-Tasnad Kernetzky

Forschungspraxis (12 ECTS)


Afghahi Keikavoos: Development of adaptive radio systems for industrial applications
Wireless real-time communication plays an increasingly pivotal role in industrial automation. Next generation high performance wireless technologies have to meet highest demands regarding latency, efficiency and reliability. Further, they have to be smart and adapt to an ever changing radio environment. In this internship you will participate in the research and development of adaptive wireless communication systems for application in the novel field of Industry 4.0. Using a Software Defined Radio (SDR) system you will develop a spectrum sensing procedure, which enables higher efficiency and reliability of wireless communication technologies for industrial applications. This internship will consist of the following tasks: · Getting familiar with the SDR development using USRP (Universal Software Radio Peripheral) and GNU Radio · Development of a spectrum sensing algorithm using the USRP hardware platform · Software development for interferer detection and smart adaptive channel allocation · Creation of a wireless network prototype, which dynamically adapts to a changing radio environment in an industrial scenario
Supervisor: Ginni Khanna, Neda Petreska

Muhammad Firas Hammosh: Is Online PCA Information-Preserving?
In this research internship, and overview over existing online (i.e., iterative, recursive, etc.) algorithms for Prinicipal Components Analysis (PCA) should be given. We try to find our which (if any) of these algorithms is invertible in the sense that one can reconstruct the original data from only looking at the rotated data. For those algorithms for which this is not possible, the (relative) information loss should be computed.
This work thus builds the bridge between PCA given knowledge of the covariance matrix (given-statistics) and PCA given only the sample covariance matrix (given-data). While no information is lost in the former, the information loss in the latter was shown to be substantial. We believe that the information loss of online PCA lies somewhere in between.
Supervisor: Bernhard Geiger

Ralf Peteranderl: Gaussian Noise Models for Optical Fiber Systems
The propagation of a signal through an optical fiber is typically modelled by a nonlinear partial differential equation known as the Nonlinear Schrödinger Equation (NLSE). Unfortunately, there exists no analytical solution to this equation and numerical approximations are computationally expensive. Approximate closed-form equations have been introduced that model the impact of fiber nonlinearities as additive white Gaussian noise. Recently, these Gaussian noise (GN) Models have been extended to take into account the dependence of fiber nonlinearities on the modulation format. The student’s task is to give an overview of the classical GN models and their recent extensions. A focus shall be made on the key steps of the derivation and the underlying approximations.
Supervisor: Tobias Fehenberger

Thomas Wiegart: Evaluation of Non-Binary LDPC codes for Coded Modulation
In this Forschungspraxis, the student reviews the principles of non-binary LDPC codes and will apply it to a coded modulation scenario. In particular, the internship will deal with the efficient implementation of a non-binary LDPC decoder and the evaluation of different codes presented in literature for higher-order modulation. As the Forschungspraxis progresses, it should also focus on the combination with probabilistic amplitude shaping.
Supervisor: Fabian Steiner

Maximilian Schädler: Monte Carlo Integration for Optical Communication Systems
Modern optical communication sytems suffer from nonlinear fiber effects that are the main limiting factor to increased spectral efficiencies. The split-step Fourier method, which is used to simulate the propagation of an optical signal through fiber, is computationally highly complex, which makes a detailed analysis of the impact of various system parameters on the fiber nonlinearities practically impossible. In this project, Monte Carlo methods are studied in general and applied to optical communication systems. The aim is to find approximate solutions for non-closed-form expressions that describe the impact of the fiber nonlinearities on the signal.
Supervisor: Tobias Fehenberger

Emna Ben Yacoub: M-Type Approximation of Hidden Markov Models
In this research project, we replace transition and observation probability matrices of hidden Markov models (HMMs) by matrices where each entry is an integer multiple of integer M (i.e., is "M-type"). The problem is an immediate extension of approximating finite-length probability vectors by M-type vectors.

The Viterbi algorithm can be used to infer the state sequence from the observation sequence, given that the algorithm has knowledge of the transition and observation matrices. If, instead of the true matrices, the algorithm has knowledge only of their M-type approximations, this will lead to an increase in error probability. We try to find a connection between a probabilistic divergence measure between the true and the M-type model (e.g., Kullback-Leibler divergence rate, matrix norms, etc.) and this increase in error probability.
Supervisor: Bernhard Geiger, Rana Ali Amjad

Venkatesh Satagopan: Error-Correction for Partially Stuck Memory Cells
Supervisor: Antonia Wachter-Zeh

Anubhab Banerjee: Analysis of Some Code-Based Cryptosystems
Supervisor: Antonia Wachter-Zeh

Sayantini Majumdar: Sequence Reconstruction for Insertion and Deletion Errors
Supervisor: Andreas Lenz

Tobias Popetz: Analysis of mobile device communication sequences observed in public networks for reproduction in a simulated network
The communication of a mobile device in a public network is affected by various impairments on the radio channels (e.g. attenuation, multipath reception, Doppler shift). This elicits a specific communication behavior which is recorded in a device log. In this Forschungspraxis the device log is analyzed to identify relevant information for subsequent reproduction of the observed communication behavior under laboratory conditions using simulators for network components and radio channel impairments.
Supervisor: Tobias Prinz, Fa. Rohde & Schwarz GmbH & Co. KG, 81671 München

Forschungspraxis (6 ECTS)


Joachim Neu: Evaluation of Spatially Coupled LDPC Codes
The student will review the basics of LDPC convolutional codes and implement a window decoder. Using regular LDPC code ensembles, the student will investigate their performance on the biAWGN channel. If time permits, the work will also consider coded modulation setups involving higher order modulations with probabilistic shaping.
Supervisor: Fabian Steiner