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


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

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.

The thesis basically consists of
1) Algorithm optimization and code design for security primitives with given range of channel parameters, desired block lengths and BERs.
2) Quantizer design for higher reliability with transform-coding for Gaussian sources through AWGN channels.
3) Information theoretic analysis of designed signal processing steps for real source statistics.

Pre-requisites: Information theory, Channel Coding

Supervisor: Onur Günlü

Efficient Algebraic Decoding of Subspace Codes for Network Coding
Subspace codes were proposed by Kötter and Kschischang in 2008 for error control in random linear network coding (RLNC). The main idea is to encode information by the choice of a subspace rather than a choice of a vector. A basis for the selected subspace is then transmitted over a channel. The decoder returns the subspace that is closest to the received subspace according to some metric.
I offer topics on efficient (list and unique) decoding algorithms for subspace and rank-metric codes that allow to correct errors beyond the unique decoding radius.

Prerequisites:
You should be interested in Channel Coding and should have good knowledge in (linear) Algebra.
Supervisor: Hannes Bartz

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: 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

Ingenieurspraxis


A mediawiki for LNTwww
The LNTwww is based on a custom content management system and needs to be migrated to a mediawiki installation. Although basic features are already implemented, the project is huge. Furthermore, it is currently self-hosted and should be hosted by the faculty in the future. The task of the student is to migrate content and to evaluate if a hosting by the faculty is feasible and possible. The student should also be able to have a good understanding of technologies used for web sites.
Supervisor: Markus Stinner

Community Detection in Dramatic Plays
In einer vorangegangenen Bachelorarbeit wurden Methoden untersucht, mit denen stark interagierende Personengruppen innerhalb eines Dramas detektiert werden koennen ("community detection"). Diese Methoden sollen jetzt in das bestehende Projekt "dlina" eingebaut werden.

Konkret sollen in einem ersten Schritt ein Teil der bestehenden Datensaetze mit Informationen ueber die Personengruppen ergaenzt werden. In einem weiteren Schritt sollten die Methoden in den bestehenden Workflow integriert werden, sodass auch die Personengruppen neu hinzugefuegter Dramen automatisch verfuegbar sind.

Erforderliche Grundkenntnisse: Matlab bzw. Python; Erfahrung mit D3.js, Visualisierung und Datenbanksystemen ist sicher hilfreich.
Supervisor: Bernhard Geiger

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: Ali Amjad

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: Ali Amjad

External Master Theses


Fundamental limits of cooperation with imperfectly shared state information

POSITION: EXTERNAL MASTER THESIS[PDF]

OPEN POSITIONS (FUNDED FROM ERC ADVANCED PROJECT "PERFUME")

Technical Context: The “PERFUME” project benefits from an “ERC Advanced” (European flagship) funding to investigate the so-called Smart Device Communications within the future Mobile Internet. Despite successes with past and current (5G) research, new paradigms leading to greater spectral efficiencies and intelligent network organizations will be in great demand to absorb the continuous growth in mobile data. Classical wireless design places the radio device under the tight control of the network. Pure network-centric designs, such as optical cloud- supported ones raise cost and security concerns and do not fit all deployment scenarios. More importantly these conventional approaches under-utilize growing local memory and computing capabilities at the device side (tablets, sensors, robotic objects such as wirelessly connected aerial drones etc.).

Our project envisions a radically new approach to designing the mobile Internet, which taps into radio devices’ new capabilities. Our approach recasts devices as distributed computational nodes solving together multi-agent problems, allowing to maximize the network performance by exploiting local measurement and information exchange capabilities. The projects sets novel objectives such as understanding new information theory limits for systems with decentralized information, the development of novel device communication methods, jointly with so-called team decisional statistical signal processing algorithms. The project will demonstrate the gains associated with exploiting the devices’ collective, network friendly, intelligence in pushing the frontiers of mobile Internet performance. Please visit http://www.eurecom.fr/cm/gesbert/erc for more details on the project.

Expertise and skills: Several master thesis are proposed for talented students with an excellent academic track . The project is at the frontiers of signal processing, communication theory, network information theory, game and optimization theory, artificial intelligence, as well as real-time implementation and experimentation, such that the subjects can be adapted to the desire and the skills of the students.

Practical Conditions: This position is located at EURECOM, in the French Riviera, near Antibes and Nice. The position being offered as part of the ERC project, the student will have a team of phd students and researchers providing interactions and a motivating work atmosphere. The starting date is flexible and can be discussed.

The student would be paid around 900 euros after taxes. Conditioned on the quality of the work realized, travels to international conferences could be funded. Ideally, this thesis would be the starting point of a doctorate at EURECOM.

For more information on any of the previous points, please do not hesitate to write to paul.dekerret@eurecom.fr or david.gesbert@eurecom.fr

Supervisor: David Gesbert and Paul de Kerret

Supervisor: Georg Böcherer, Prof. David Gesbert (EURECOM), Paul de Kerret (EURECOM)

Open Student Jobs

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Theses in Progress

Bachelor Theses


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

Anas Azouni: Error Detection Outer Codes for Polar Codes
Polar codes are capacity achieving codes that have rather bad performance for short and medium length codes. Its performance can be improved using list decoding and outer error detection codes, like CRC codes. The goal of this Bachelor's thesis is to investigate different outer codes that work for error detection.
Supervisor: Tobias Prinz

Safwen Dridi: Replacing Flash for the LNTwww
The LNTwww is based on a custom content management system. Many learning examples are provided in Flash. However, Flash is not supported on many platforms, e.g. iOS, and will likely not be supported in the future at all. The task is to evaluate possible alternatives for Flash multimedia content and to implement a preview of possible new alternatives to make the content accessible for as many students and platforms as possible. The student should also be able to have a good understanding of technologies used for web sites.
Supervisor: Markus Stinner

Master Theses


Clemens Bloechl: Aggregation of Hidden Markov Models - Theory and Applications
The topic of the thesis is to develop and analyze information-theoretic aggregation methods to reduce the state space and/or the observation space of hidden Markov models. Using the Kullback-Leibler divergence rate as cost function, we expect connections with the information bottleneck method, lumpability, and spectral aggregation techniques.

In the second part of the thesis, the developed methods shall be applied to practical examples, such as speech recognition systems. As a further example, the techniques shall be used to collapse output states of a discrete memoryless channel, without affecting the error probability of a Viterbi algorithm decoding a convolutional code.
Supervisor: Bernhard Geiger, Ali Amjad

Marcel Grec: Fountain Codes under inactivation decoding
Fountain codes are a class of erasure correcting codes which can potentially generate an unbounded number of encoded symbols. Due to their flexibility they are a very efficient solution for the reliable multicasting setting, where a transmitter wants to deliver the same object (data file, video streaming etc.) to a number of receivers that have independent channels. In fact, fountain codes have been adopted in a number of standards, among others in:
  • UMTS Multimedia Broadcast Service (MBMS)
  • LTE evolved Multimedia Broadcast Service (eMBMS)
  • IETF RFC 6330, RaptorQ Forward Error Correction Scheme for Object Delivery
  • ITU-T H.701, IPTV multimedia services and applications for IPTV
The potential impact of fountain codes is especially high in the case of LTE, where an explosive growth of the number of services and users employing eMBMS is expected in the next years. The most preeminent services that will profit from eMBMS are:
  • Live event broadcasting to handhelds
  • Content delivery to automobiles
  • Software and firmware updates for connected devices
  • Emergency alerts
And at the core of all this services lie fountain codes. Despite the fact that fountain codes can be found in standards since a few years, the understanding of some of their aspects are not yet well understood. In particular, most of the works on fountain codes assume suboptimal iterative (belief propagation) decoding and asymptotically large information blocks. However, in practice, short information blocks are used and a different decoding algorithm employed, inactivation decoding. The goal of this Master Thesis is investigating several fountain codes under inactivation decoding. Concretely, the focus of this thesis is on analyzing the complexity of inactivation decoding. Inactivation decoding can be split into 4 different phases:
  • Triangulation
  • Zero-matrix procedure
  • Gaussian Elimination
  • Back substitution
The first phase of the algorithm, the “triangulation” phase can be carried using different techniques. Although inactivation decoding is widely used in practice, there is still no deep understanding of its many variants. The goal of the thesis is evaluating the algorithmic complexity of the different triangulation techniques. The tasks to be carried out are the following
  1. Perform a Literature survey on inactivation decoding for fountain codes
  2. Analyze the algorithmic complexity of different triangulation techniques.
    • Maximum component inactivation
    • Maximum weight inactivation
    • Permanent inactivation
    • Random Inactivation
  3. Develop a realistic simulator for the different inactivation strategies.
  4. Compare the different inactivation techniques in a realistic setting.
Supervisor: Patrick Schulte, Francisco Lazaro-Blasco

Xianhe Yangzhang: Capacity Estimation using Nonlinear Frequency-Division Multiplexing for Optical SMF Channel
The capacity of the single-mode fiber (SMF) at high-SNR region is a critical topic for researchers in optical and information theory society. Due to the application of linear methods such as Nyquist-pulse shaping, OFDM, WDM, SDM, etc. in optical SMF transmission, the fiber Kerr-effect induced nonlinearity causes significant intra-/inter-channel interference which might lead to an underestimation of the capacity limit for SMF channel. Nonlinear frequency-division multiplexing (NFDM) based on the nonlinear Fourier Transform (NFT) is a promising approach to overcome the bottleneck of the data rate at high-SNR region. It treats fiber nonlinearity and chromatic dispersion as essential parts of the transmission such that the channels don't interfere with each other in nonlinear frequency domain. In this master thesis, an NFDM system at the defocusing case using forward and backward NFT will be developed and evaluated , aiming at giving a better lower bound of the capacity for optical SMF channel.
Supervisor: Yingkan Chen, Prof. Mansoor I. Yousefi

Julian Renner: Multidimensional Probabilistic Shaping for the Nonlinear Fiber Channel
Probabilistic shaping has shown to give large sensitivity gains for the additive white Gaussian noise (AWGN) channel and also for the nonlinear fiber channel. For a fiber-optic communication system, the optimal input distribution is unknown, and typically, heuristics are used to realize shaping. In this thesis, an approximate model of the fiber channel is used to numerically find and evaluate optimized input distributions, while exploiting the multi-dimensional nature of the considered channel.
Supervisor: Tobias Fehenberger

Delcho Donev: Channel Coding for Pulse Position Modulation
Supervisor: Georg Böcherer, Gianluigi Liva (DLR)

Berkay Köprü: Coding Schemes for Multiple Access Communications
Multiple access channel (MAC) can be seen as the model where two or more transmitters send information to a common receiver. For instance, multiple mobile phones communicating to a base station can be modeled as a MAC. The main challenge in MAC is that the receivers may share the transmission channel in an uncoordinated way, such that their transmissions can interfere. This problem is solved in many modern communication systems by allocating orthogonal resources (like time slots or frequency bands) to the transmitters such that the interference is avoided. However, although it is a practical solution, orthogonalization is not the optimal solution if considered from an information theoretic point of view. According to the theory, non-orthogonal transmission in MAC can be beneficial in many scenarios, however for these scenarios the coding schemes should be designed carefully to benefit from the non-orthogonal communication. Next generation cellular systems will support a multitude of services where multiple nodes are involved in the communications simultaneously, including vehicle-to-vehicle communications and massive machine communications. For these highly challenging communication scenarios, the design of the multiple access schemes will be of practical importance. In this thesis, practical coding schemes for MAC should be investigated, implemented and compared to the theory and to the existing solutions. Task Description: The tasks of the student can be summarized as follows: Studying the multiple access related scenarios for the next generation communication systems. Determining the correct channel models for the related scenarios. Basic theoretical evaluation of the scenarios according to the given models and comparison to the performance of the orthogonal schemes. Studying the already proposed solutions like IDMA and SCMA. Understanding the basic tools for channel code design, like EXIT analysis. Development and implementation of practical coding schemes for the selected multiple access scenarios. Simulations and comparisons to the state-of-the-art solutions and to the theory The actual tasks will be defined jointly with the candidate according to his background and the achievements. The focus can be put either on the theoretical analysis of multiple access schemes for different scenarios, or the more practical design and evaluation of coding schemes and receiver algorithms.
Supervisor: Patrick Schulte, Dr. Onurcan Iscan (HUAWEI), Dr. Ronald Boehnke (HUAWEI)

Lukas Holzbaur: Decoding Schemes for Staircase Codes
Supervisor: Hannes Bartz, Antonia Wachter-Zeh

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)

Julian Leyh: Evaluation of Transmission Parameters of a Digitally Modulated TV Signal

During modulation and transmission of OFDM signals there are various disturbance effects taking place, which can influence the quality of the signal at the receiver and therefore also the system performance. The commonly used metric 'Modulation Error Rate', which represents the magnitude of all transmitter impairments, is not sufficient to adequately track errors in the development and operation of modern digital broadcasting systems.

This thesis aims at developing, assessing, simulating, and implementing new algorithms that can provide continuous estimation of a number of transmission parameters for a real world digital television broadcasting standard for which existing methods do not give satisfactory results, which is due to the used frame structure.

Supervisor: Onur Günlü, Dipl.-Ing. Medientechnologie (TU) Hardi Klenner (Rohde&Schwarz)

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

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

Thomas Wengerter: wird nachgetragen!
Supervisor: Gerhard Kramer, Fa. Rohde & Schwarz GmbH & Co. KG, 81671 München

Safwen Dridi: Replacing Flash for the LNTwww
Supervisor: Gerhard Kramer, Lst. f. Nachrichtentechnik (LNT)/TUM

Forschungspraxis (12 ECTS)


Liu Xiaotong: Simulator in Matlab for MIMO Multiport Communications
The purpose is to build a Matlab simulator that can incorporate both circuit and channel models for MIMO communications in order to evaluate the achievable rates with different RF front-end designs in various propagation scenarios.
Supervisor: Andrei Nedelcu

Edward Wall: Finite-Precision Gaussian Mixture Models
In practical systems, Gaussian mixture models can only be presented with finite-precision. The first goal of this research internship is to survey the literature about how this problem is usually dealt with: Can we trade parameter precision for the number of mixture components? Can we restrict the covariance matrix to be diagonal? To be an identity matrix? What kind of cost functions are used to characterize these trade-offs? As a second goal, relative entropy shall be used as a cost function. For a simple multivariate Gaussian distribution and a given finite precision, the Gaussian distribution with quantized parameters minimizing relative entropy shall be computed.
Supervisor: Bernhard Geiger

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

Niklas Jünger: Energy-Efficiency of Massive MIMO and Network MIMO in a Local Area Acenario

Multiple-input multiple-output (MIMO) methods increase spectral efficiency. These methods can also be used to decrease energy consumption. Using many more antennas at the base station then served users is called massive MIMO. With each added antenna at the base station spectral efficiency is increased. It is however not obvious if the energy efficiency is decreased with every added antenna.

The student should review how much energy is consumed and review existing precoding and power allocation strategies for energy efficient transmission. The most well suited strategies should be adopted to the local area scenario deployments. Simulations should be run in the 3GPP two stripe building.

Supervisor: Stefan Dierks

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

Sandurkov Bojan: Real-Time FEC Comparison for DVB Transmission
Supervisor: Tobias Fehenberger, Christian Heidinger (MX1)

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

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

MSCE Internships


Muhammad Umer Anwaar: Coding Techniques for Natural Language Processing
In this internship the student will review current state-of-the-art techniques for Natural Language Processing (with a focus on Machine Translation). Specifically, the student will check which of these techniques employ Hidden Markov Models, and whether they have connections to decoding algorithms for channel codes. Finally, the student should present a recommendation if, and how, list decoding methods can be applied in machine translation. If you are interested to pursue this topic for your Master's thesis that is also possible.
Supervisor: Ali Amjad, Bernhard Geiger