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).
|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|
|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 )
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
Pre-requisites: Information theory, Channel Coding
|Supervisor: Onur Günlü|
|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 non-uniformly spaced input can replace the common uniform input. Prerequisites for this thesis: digital communications (must!), basics in optical communication systems (important), information theory (equally important). If you are interested in this work, please contact me at firstname.lastname@example.org to set up a personal meeting.|
|Supervisor: Tobias Fehenberger|
|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.
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
- Information Theory (must)
- Pleasure with mathematics (must)
- Multiuser information theory (beneficial)
|Supervisor: Lars Palzer|
|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|
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.
Supervisor: David Gesbert and Paul de Kerret
|Supervisor: Georg Böcherer, Prof. David Gesbert (EURECOM), Paul de Kerret (EURECOM)|
Open Student Jobs
Das Lerntutorial LNTwww soll auf eine zeitgemäße technische Basis gestellt werden. Dafür ist es nötig, den Inhalt vom alten Backend in das neue, auf mediawiki basierende Backend zu migrieren. Anforderungen: eigenständiges...
Theses in Progress
|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|
|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|
|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:
|Supervisor: Patrick Schulte, Francisco Lazaro-Blasco|
|Janis Surof: Intradyne Reception in Optical Satellite Links|
|The master thesis is set out to perform analytical and experimental feasibility study of an optical BPSK and QPSK optical link in GEO satellite system scenario. The task is to analyse and simulate a coherent phase-modulation optical link with respect to optical signal and noise power limitations, linear and nonlinear system e ects and atmospheric distortions. Then, series of equalising and correcting algorithms will be developed in MATLAB and applied to the transmitted signal in order to compensate for the simulated distorting e ects. The analytical results will be later experimentally demonstrated in laboratory conditions.|
|Supervisor: Tobias Fehenberger, Dr. Juraj Poliak (DLR)|
|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)|
|Manuela Meier: Syndrome Decoding of Interleaved Subspace Codes|
|Subspace codes are used for error control in random linear network coding (RLNC) and can be constructed from the Reed-Solomon like Gabidulin codes. A channel model for RLNC is the operator channel which incorporates insertions (of additional code symbols) as well as deletions (of code symbols). It has been shown, that interleaved or punctured subspace codes are very resilient against insertions if an interpolation-based decoder is used. The goal of this thesis is to analyze syndrome-based decoding schemes for interleaved subspace codes that are more resilient against insertions than deletions. The results should be verified by simulations.|
|Supervisor: Hannes Bartz, Vladimir Sidorenko|
|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)|
|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|
|Hasan Yagiz Özkan: Image Tracking Algorithm Development|
|Supervisor: Gerhard Kramer, Fa. Bases Teknoloji Arge Sanay, Hr. T. Cirak, Istanbul|
|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|
|Clarissa Hamann: Test|
|Supervisor: Gerhard Kramer, Dedan Kimathi University, Kenia|
|Mohamed Nabil Babai: Migration of media content 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|
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|
|Nathan Gibbs: Estimation of (Generalized) Mutual Information for Real-time Applications|
|Evaluating the post-FEC BER of a coded-modulation system using the uncoded (pre-FEC) BER is a commonly used method in fiber-optics. However, this approach can be inaccurate. Instead, mutual information (MI) is a natural figure of merit to consider as it is an achievable rate for a decoder that operates on symbol metrics. For the practical bit-interleaved coded modulation systems, the generalised mutual information (GMI) has been shown to accurately predict the post-FEC performance. In this Forschungspraxis, GMI estimation under typical constraints for real-time applications is investigated.|
|Supervisor: Tobias Fehenberger|
|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|
|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|