Laufende Arbeiten

Bachelorarbeiten

Comparing Different Approaches for Deletion Correction for Data Storage in DNA

Comparing Different Approaches for Deletion Correction for Data Storage in DNA

Beschreibung

The student investigates different methods to correct deletion errors that occur in data storage in DNA. Codes that will be used are VT-codes and Guess & Check codes.

Betreuer:

Student

Stephan-Daniel Gravert

Locality in Braided Codes

Locality in Braided Codes

Beschreibung

Loaclity has recently been introduced as a code porperty with applications in distributed data storage. The goal of this work is to examine the such locally repairable codes (LRCs) in the setting of braided codes.

Betreuer:

Student

Maria del Mar Morejón de Girón

Programming HTML5 Applets for the LNTwww: Analytical Signal, Equivalent Low-pass Signal, Bessel Functions

Programming HTML5 Applets for the LNTwww: Analytical Signal, Equivalent Low-pass Signal, Bessel Functions

Beschreibung

Porting the LNTwww to the new MediaWiki format involves reprogramming of Flash programs to HTML5 with JavaScript applets. The student's task is to redesign and program at least two Applets in HTML5/JS and also to rethink and translate the mathematical theory describing the applets' functions.

Betreuer:

Student

Xiaohan Liu

Implementation of an Acoustic Data Transmission System

Implementation of an Acoustic Data Transmission System

Beschreibung

Matlab implementation of an acoustic data transmission system.

Betreuer:

Julian Renner

Student

Ludwig Lohmer

Masterarbeiten

Kanalschätzung für leitungsgebundene Kanäle bei zeitvarianten Störungen

Kanalschätzung für leitungsgebundene Kanäle bei zeitvarianten Störungen

Beschreibung

- Theoretische/analytische Betrachtung von Kanalschätz-
verfahren für OFDM-Systeme
- Simulation eines trainingsbasierten Kanalschätzers in Matlab
- Implementierung und Test des Kanalschätzverfahrens in
VHDL und Synthese der digitalen Schaltung in einem FPGA
- Funktionsverifikation anhand ein

Kontakt

Betreuer:

Karl-Tasnad Kernetzky - Dr. Thomas Weidinger (Rosenberger)

Student

Matthias Lechner

LDPC Decoding Algorithms Based on Ternary Message Passing

LDPC Decoding Algorithms Based on Ternary Message Passing

Beschreibung

We investigate message passing algorithms with a ternary alphabet based on Algorithm E. The student will derive density evolution approaches for different decoding approaches for protograph based LDPC codes and design optimized codes.

Betreuer:

Student

Emna Ben Yacoub

Decoding from Erroneous Samples of a Set

Decoding from Erroneous Samples of a Set

Beschreibung

Fundamental limits and clustering approaches to decode several erroneous samples of a set of sequences is investigated.

Betreuer:

Student

Arda Can Özensoy

Distributed Lossy Source Coding for Gaussian Mixtures

Distributed Lossy Source Coding for Gaussian Mixtures

Beschreibung

This thesis investigates a two-terminal distributed source coding problem. The goal is to derived inner and outer bounds for the achievable rate region when correlated Gaussian mixtures are to be compressed in a distributed manner and reconstructed jointly.

Betreuer:

Student

Muhammad Firas Hammosh

Implementation and Validation of a FPGA based signal acquisition for ranging and communication applications

Implementation and Validation of a FPGA based signal acquisition for ranging and communication applications

Beschreibung

The optical communication group of DLR’s Institute of Communications and Navigation develops experimental laser systems for optical links. The communication system development contains several subsystems including the signal transition from the analog to the digital domain. This is done by the use of analog to digital converters (ADC) which interface with the processing device, in this case a field programmable gate array (FPGA). As the future operation site will be in space the received and digitalized signal is suffering from several impairments either caused by the optical transmission channel or the transition from the optical to digital domain. In order to recover the received signal e.g. atmospheric turbulences or mismatches caused by the use of free-running ADCs have to be compensated for. The successful applicant will support our team in the development of an experimental setup, in particular by implementing and validating the ADC-to-FPGA interface and further sub-functionality in order to enable signal recovery.

Goals:
- Definition of transmission channel and recovery system impairments and possible countermeasures
- FPGA based integration of a ADC-to-FPGA interface realized by use of the JESD204B standard
- FPGA based integration of signal recovery stages like timing recovery (expandable)
- Testing and validation of the implemented functionality including optional field tests

Voraussetzungen

- Study direction of electrical engineering (Master level)
- Solid skills in VHDL respectively Verilog
- Knowledge in communication theory is a plus
- Experience within the area of analog to digital converters is a plus

Kontakt

raphael.wolf@dlr.de

Betreuer:

Karl-Tasnad Kernetzky - Raphael Wolf (DLR)

Student

Michael Filkorn

Secure Identification for Gaussian Channels

Secure Identification for Gaussian Channels

Beschreibung

In next generation connectivity systems, which rely on robust and low-latency information exchange, there exists communication tasks in which the Ahlswede/Dueck identification scheme is much more efficient
than Shannon’s transmission scheme. In this thesis one should provide a coding scheme for secure identification and determine the secrecy
capacity of the Gaussian Channel.

Voraussetzungen

Information Theory, Signal Theory

Betreuer:

Student

Wafa Labidi

Protected Code-based Post-Quantum Security

Protected Code-based Post-Quantum Security

Beschreibung

The foreseeable breakthrough of quantum computers represents a risk for communication which uses public-key cryptography. In order to prepare for such an event, embedded devices must integrate post-quantum cryptography, a set of algorithms based on mathematical problems that remains secure even in the presence of the quantum computers. Code-based is one of the most promising post-quantum cryptography. However, the implementation of code-based cryptography has two main challenges: i) satisfy performance and power constraints; and ii) resist side-channel attacks, which uses leakages derived from the implementation (timing, power or electromagnetic characteristics) to retrieve the secret information. The goal of this thesis is to implement a protected version (resistant to side-channel attack) of the newest version of the Gabidulin-Paramonov-Tretjakov code-based post-quantum cryptosystem. This Master thesis will be supervised by Dr. Johanna Sepúlveda (Chair of Security in Information Technology) and Prof. Dr.-Ing. Antonia Wachter-Zeh (Professorship for Coding for Communications and Data Storage).

Betreuer:

Julian Renner, Antonia Wachter-Zeh

Student

Robin Winzler

Intra-cell Mobility in 5G Multi-beam Systems Operating at High Carrier Frequency

Intra-cell Mobility in 5G Multi-beam Systems Operating at High Carrier Frequency

Beschreibung

Unlike legacy cellular networks, two levels of user mobility are distinguished in 5G systems, applying analog radio frequency (RF) beamforming.

1) Inter-cell user mobility, where the user experience (UE) is handed over from one cell to another, and the handover decision is based on cell measurements that are derived from beam measurements.

2) Intra-cell mobility, where the UE can switch between beams of the same serving cell and where the switching decision is based on beam measurements.

 

The focus of this thesis is the intra-cell mobility, which is a pre-requisite for understanding the inter-cell user mobility. The Master 's thesis student will first evaluate the performance of the specified methods in the 5G standard related to beam switching, failure, and recovery. Based on the outcome, new concepts or enhancements that increase the robustness of the intra-cell mobility will be developed.

Kontakt

ingo.viering.ext@nokia.com

Betreuer:

Onur Günlü - Dr.-Ing. Ingo Viering (Nokia Bell Labs)

Student

Ugur Baran Elmali

SW Implementation for NR FEC

SW Implementation for NR FEC

Beschreibung

  • Study of the NR FEC Specifications (i.e. Polar Codes and LDPC Codes)
  • Study of the Decoding Algorithms for the NR FEC Codes
  • Implementation of the NR FEC Codes on General Purpose Processors using SIMD technology
  • Profiling of the implementation with respect to latency, throughput and memory footprint

Voraussetzungen

  • University degree in computer engineering or comparable course of study
  • Profound knowledge on state of the art processor architectures
  • Profound knowledge on state of the art programming (making use of SIMD and multi-core technologies)
  • Profound knowledge on state of the art operating systems (such as Windows or Linux)
  • Good communication skills
  • Self-motivated and self driving personality
  • Ability to work in an inter-cultural working Environment

Betreuer:

Fabian Steiner, Peihong Yuan - Moritz Harteneck (Rohde & Schwarz)

Student

Yadhunandana Rajathadripura Ku

Optimization of Power Consumption in Envelope Tracking (ET) Digital Signal Processing (DSP) with Focus on Digital Filters

Optimization of Power Consumption in Envelope Tracking (ET) Digital Signal Processing (DSP) with Focus on Digital Filters

Beschreibung

Power consumption is one of the most critical Key Performance Indicators (KPIs) in mobile communication. The rapidly increasing requirement for higher throughput makes it more difficult to keep the power consumption low, which is important for a better user experience. The purpose of this thesis is to analyse and to optimize given digital filters in the ET DSP in terms of the filter order and chosen structure with the aim to achieve a lower power consumption.

A major task is the expansion of the filter structure to parallel processing, enabling a sample rate that is higher than a given system clock rate. Another major task is the comparisons between different filters IIR, FIR, etc. and subsequent down-selection meeting predefined criteria. After the analysis, the filters shall be implemented as bit-true model in SystemC.

Qualifications:
Programming languages: MatlabC/C++/SystemC
Background: Digital signal processing, understanding of digital filters

Kontakt

andreas.boehme@intel.com

Betreuer:

Onur Günlü - Mr. Andreas Böhme (Intel Mobile Communication GmbH)

Student

Wassim Zaouali

Decoding of Interleaved Codes

Decoding of Interleaved Codes

Stichworte:
Coding Theory, Interleaved Codes, Code-based Cryptography

Beschreibung

Interleaving is a decoding method that allows correcting burst errors beyond the unique decoding radius with reasonable complexity. It is already in use for improving the performance of Reed-Solomon codes in storage applications such as CD and DVD . However, for many codes it is unclear how to use interleaving to decode up to their designed minimum distance. This work will focus on codes with application to security, i.e., code-based cryptography. Here interleaving has the potential to increase the security level for a given key size.

Betreuer:

Lukas Holzbaur, Julian Renner

Student

Hedongliang Liu

Traffic Signal Phases and Timing Estimation based on GPS Tracks

Traffic Signal Phases and Timing Estimation based on GPS Tracks

Beschreibung

Autonomy in vehicles has been a subject of intensive research in the last decades. This thesis is a part of a project developing a cloud-based driver-assistance function in order to increase the autonomy of the vehicle by using the traffic signals. The vehicle will be able to predict the signal state and make optimal decisions about the speed, position, etc.  

The main objective of this thesis is the estimation of the Signal Phase and Timing Information (SPaT) through statistical processing of the Navigation Data. In the literature, a wide range of statistical tools like the Maximum a Posteriori (MAP) estimation, Least Square (LS) estimation and Hypothesis testing is applied to address this problem. In addition, Kalman filtering based on a hidden Markov model (HMM) is also used for prediction of future signal states. The student will implement and compare such methods.

Kontakt

dominik.bruckner@daimler.com

Betreuer:

Onur Günlü - Dominik Bruckner (Daimler AG)

Student

Mohamed Mezghani

Polar Code Design for Parallel Channels

Polar Code Design for Parallel Channels

Beschreibung

In this thesis, polar code design principles for parallel channels and higher order constellation formats are investigated. The problem naturally arises if polar codes should be used for OFDM based transmission systems.

Voraussetzungen

Information Theory, Channel coding, Channel Codes for Iterative Decoding

Betreuer:

Student

Thomas Wiegart

Combined Belief Propagation and List Decoding

Combined Belief Propagation and List Decoding

Kurzbeschreibung:
Complexity is a major issue for decoding error correcting codes like LDPC codes. We want to combine two methods of decoding for complexity trade-off

Beschreibung

Complexity is a major issue for decoding error correcting codes like LDPC codes. Two decoding algorithms are belief propagation (BP) and list decoding with rather low and high complexity, respectively. However, list decoding has better results than BP.

The students task is to implement both decoder and combine them such that one can trade complexity versus performance seamlessly.

Voraussetzungen

Interest in error correcting codes.

Betreuer:

Student

Olivia Ngwabou

Effect of distributed noise on the Nonlinear Fourier Transform

Effect of distributed noise on the Nonlinear Fourier Transform

Stichworte:
Nonlinear Schrödinger Equation, Nonlinear Fourier Transform

Beschreibung

The Nonlinear Fourier Transform (NFT) is a mathematical tool that linearizes the Nonlinear Schrödinger Equation, which is the equation that governs the fiber optic channel [1]. With the help of the NFT, it is possible to remove the nonlinear interference between channels in a fiber optic system. However, the NFT fails to model additive noise. In this thesis, we aim to characterize the effect of noise on the NFT, which would greatly increase the usefulness of this tool for system design.

 

[1] http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6808480

Voraussetzungen

Knowledge of fiber optic communication theory is not necessarily required, but students applying for this thesis should be familiar with complex analysis.

Kontakt

javier.garcia@tum.de

Betreuer:

Student

Run Yang

Forschungspraxis oder MSCE Forschungspraxis

Implementing a simulation tool for high-speed optical communication systems

Implementing a simulation tool for high-speed optical communication systems

Beschreibung

The work is about implementing a simulation platform with MATLAB for the evaluation of the physical layer specifications for passive optical networks (PON). For that, the transmitter and receiver components are studied and modeled. The distortion effects of the transmission path, including  chromatic dispersion, fiber nonlinearities and receiver noise are taken into consideration in order to assess the feasibility of PON requirements with high data rates. In addition to that, the performance of multiple modulation schemes including NRZ, PAM-4 and eventually Electrical Duo-Binary should also be investigated and compared.

Betreuer:

Norbert Hanik - n.n. (Intel Corporation)

Student

Firas Chaabouni

Ausarbeiten eines Konzeptes, um „obsolete“ Microcontroller durch neue Microcontroller auf einem bestehenden CPU Board bei minimaler HW Modifikation zu ersetzen

Ausarbeiten eines Konzeptes, um „obsolete“ Microcontroller durch neue Microcontroller auf einem bestehenden CPU Board bei minimaler HW Modifikation zu ersetzen

Beschreibung

Praktikumsplan: - Analyse - Analyse der ausgewählten neuen MCU gegenüber der bereits eingesetzten CPU o Definition der einzelnen Schnittstellen / alternativen Schnittstellen - Analyse des bestehenden Schaltungsdesigns bzgl. der neuen MCU o Spannung / Energiebedarf (Einfluss auf die DC/DC Stabilität, Spannungsüberwachung (Über / Unter), notwendige Spannungen) o Analyse der internen Datenbusse (EBI, SPI, I2C, …) bzgl. Datenrate, Signalpegel, Impedanzen o Analyse aller weiteren MCU Schnittstellen - Analyse des Layout Bedarfs (neue MCU im Verhältnis zur alten MCU) o Abgleich der Flächenverhältnisse o Pin-Allokierung - Konzeptdefinition bzgl. MCU Austausch o direkter Austausch auf dem PCB (Re-layout) o optionale Adapterplatine, welche anstelle der alten MCU eingesetzt wird o Definition der Peripherieanpassungen - Zusammenfassung der Optionen o Ermittlung der Aufwände o Definition des empfohlenen Vorgehens (generisch)

Betreuer:

Norbert Hanik - n.n. (AES GmbH)

Student

Jacob Hesse

Two-Terminal Quantized Compressive Sensing with Approximate Message Passing Reconstruction

Two-Terminal Quantized Compressive Sensing with Approximate Message Passing Reconstruction

Beschreibung

In this thesis, we investigae a two-terminal compressive sensing problem with scalar quantization. The goal is to extend the Generalized Approximate Message Passing Algorithm to the two-terminal scenario and analyze its performance.

Betreuer:

Student

Rami Ezzine

Bounds on the block error probability of short codes

Bounds on the block error probability of short codes

Beschreibung

The asymptotic bounds for the channel codes are not relevant for short codes, e.g. blocklength up to 1000 bits. Therefore, error bounds which are relevant for such codes will be implemented.

Betreuer:

Mustafa Coskun

Student

Ilhem Brayek

Microcontrollerbasiertes Powerline System

Microcontrollerbasiertes Powerline System

Beschreibung

Der Student soll einen kleinen Testaufbau erstellen, bei dem er mit zwei STM32F103 Microcontrollern eine schmalbandige Powerline Kommunikation realisiert.

Dabei sollen auch Signalkoppler und diverse Testnetzwerke untersucht werden.

Jeder Endpunkt des Netzwerkes wird als Signalangepasst realisiert.

Zusätzlich soll eine Simulation des Netzwerkes entstehen, um verlässliche Prognosen des Systems zu ermöglichen.

Betreuer:

Student

Matthias Lechner

Distributed Source Coding in Wireless Sensor Networks

Distributed Source Coding in Wireless Sensor Networks

Beschreibung

Extending existing implementation of DSC scheme for 2 binary
sources towards multiple (3+) and continuous (Gaussian) sources
at equal rates at each source

Betreuer:

Julian Renner - (Robert Bosch GmbH)

Student

David Ginthör

Microcontrollerbasiertes Powerline System

Microcontrollerbasiertes Powerline System

Beschreibung

Der Student soll einen kleinen Testaufbau erstellen, bei dem er mit zwei STM32F103 Microcontrollern eine schmalbandige Powerline Kommunikation realisiert.

Dabei sollen auch Signalkoppler und diverse Testnetzwerke untersucht werden.

Jeder Endpunkt des Netzwerkes wird als Signalangepasst realisiert.

Zusätzlich soll eine Simulation des Netzwerkes entstehen, um verlässliche Prognosen des Systems zu ermöglichen.

Betreuer:

Student

Martin Zeller

SDR Waveform generation

SDR Waveform generation

Beschreibung

- Einarbeitung in die Python basierte Testautomatisierung
- Erstellung und Erweiterung von Testfällen
- Evaluierung, Test und Erst-Inbetriebnahme von erweiterter Wellenformfunktionalität
- Komponentendesign

Betreuer:

Patrick Schulte - (Rhode und Schwarz)

Student

Aya Ben Salha

Forschungspraxis

Forschungspraxis

Beschreibung

tbd.

Betreuer:

Norbert Hanik - (Rohde & Schwarz)

Student

Wenzel Lasinger

Exploiting non-linear outer code properties in the LDPC decoder

Exploiting non-linear outer code properties in the LDPC decoder

Stichworte:
LDPC Codes, Constant Composition Codes

Kurzbeschreibung:
The Student implements a standart LDPC Decoder and a viterbi decoder for non-linear outer codes. The viterbi decoder can provide prior (Source) information to the LDPC encoder. It is the students task to find a way to connect them and to simulate their compound behaviour

Beschreibung

The Student implements a standart LDPC Decoder and a viterbi decoder for non-linear outer codes. The viterbi decoder can provide prior (Source) information to the LDPC encoder.
It is the students task to find a way to connect them and to simulate their compound behaviour

Betreuer:

Student

Wafa Labidi

Decoding of Crisscross Errors

Decoding of Crisscross Errors

Stichworte:
Criss-Cross Errors, LRCs

Beschreibung

Crisscross errors are an error model that considers row and column wise corruption of data stored in arrays. While optimal coding schemes using Reed-Solomon Codes exist [1], recovery from errors requires extensive read operations and computations. The goals of this work are improving the decoder and finding new constructions and decoding techniques to make these codes more viable for real life systems.

[1] http://ieeexplore.ieee.org/document/6875030/

Betreuer:

Student

Hedongliang Liu

Code Design for Secret Key Generation/ Left over Hash Lemma

Code Design for Secret Key Generation/ Left over Hash Lemma

Beschreibung

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.

Betreuer:

Student

Amir Hossein Rezaeitabar

Error-Correction for Partially Stuck Memory Cells

Error-Correction for Partially Stuck Memory Cells

Beschreibung

.

Betreuer:

Student

Venkatesh Satagopan

Ingenieurpraxis

Implementation and Evaluation of a Basic Transmission System Using the CUDA Framework

Implementation and Evaluation of a Basic Transmission System Using the CUDA Framework

Stichworte:
parallel programming, programming in C, CUDA, code performance optimization and evaluation

Kurzbeschreibung:
Within the scope of this topic a simulation for a very basic transmission system will be implemented utilizing a massive parallelism approach on GPUs via the CUDA framework by Nvidia.

Beschreibung

Within the scope of this topic a simulation for a very basic transmission system will be implemented utilizing a massive parallelism approach on GPUs via the CUDA framework by Nvidia. The main focus will be put on the implementation of the constellation mapping and demapping functionality as well as the implementation of a simple channel and pseudo random generation of test data. Even though none of these particular instances tends to be a bottleneck in more elaborate simulations a GPU implementation of these functionalities can be beneficial to circumvent the time consuming data transfer between CPU and GPU memory. Additionally an interface to Matlab has to be implemented for further processing of the generated results using the MEX format. A Matlab implementation of the system will be provided as a starting reference and for later comparisons. Over the course of this thesis, the student will get familiar with the following concepts:  parallel programming, programming in C, using the CUDA library, code performance optimization and evaluation, stochastic simulations, constellation mapping and system performance evaluation.

Voraussetzungen

There are no special requirements needed to apply for this topic. Still some knowledge in the following fields is beneficial: Basics in C programming (or basics in any other programming language), Matlab (Mex)

Kontakt

benedikt.leible@tum.de (Please attach an overview of your current grades to the email)

Betreuer:

Benedikt Leible

Student

Firas Trimech

UWB Wearable Connectivity COE Projekt

UWB Wearable Connectivity COE Projekt

Kurzbeschreibung:
UWB Wearable Connectivity COE Projekt

Beschreibung

UWB Wearable Connectivity COE Projekt

Voraussetzungen

UWB Wearable Connectivity COE Projekt

Betreuer:

Gerhard Kramer - (Flex Automotive GmbH, 70794 Filderstadt)

Student

Mariam Elsayed

SDxR Legacy Waveform Integration

SDxR Legacy Waveform Integration

Stichworte:
SDxR Legacy Waveform Integration

Kurzbeschreibung:
SDxR Legacy Waveform Integration

Beschreibung

SDxR Legacy Waveform Integration

Voraussetzungen

SDxR Legacy Waveform Integration

Betreuer:

Gerhard Kramer - (ROHDE & SCHWARZ GmbH & Co. KG München)

Student

Constantin Runge

Optimized Transform Coding for Physical Unclonable Functions

Optimized Transform Coding for Physical Unclonable Functions

Stichworte:
PUFs, Transform Coding

Beschreibung

The student will work on the state-of-the-state PUF design to generate secret keys from uncontrollable manufacturing variations of ring oscillators. Optimal transforms according to a joint security and reliability metric will be designed and implemented.

 

Betreuer:

Student

Tijani Aziz Feki

Channel Model Simulator

Channel Model Simulator

Kurzbeschreibung:
Investigation of Winner II channel model

Beschreibung

The Student investigates the Winner II channel model.

Betreuer:

Student

Yosri Ben haj ali

Studentische Hilfskräfte

C Implementation of the Faure-Loidreau Public-Key Cryptosystem

C Implementation of the Faure-Loidreau Public-Key Cryptosystem

Beschreibung

The realistic threat of a quantum supercomputer has motivated research on post-quantum cryptography. The Faure-Loidreau Public-Key Cryptosystem is considered to be secure against attacks of quantum computers.

Betreuer:

Julian Renner

Student

Marvin Xhemrishi