Summer Semester 2007

Bachelor- and Master Seminars

In preparation for your bachelor- or master thesis we offer bachelor- and master seminars. These seminars do combine the preparation of a special research topic incl. structured literature research and state-of-the-art analysis with learning the documentation and presentation skills needed in every industrial or academic job.

Bachelor- and master seminars are recommended or even mandatory in various study programs and will be dimensioned and credited appropriately. You will have to participate in regular meetings (biweekly during the semester, monthly during lecture free periods) and present your results to your peers.

Prerequisites: Bachelor- and master seminars are directly related to the prospective bachelor- resp. master thesis and therefore do require that you have all necessary requirements for starting the respective thesis. In addition you must have been donated a thesis topic by the telecommunications lab. Matlab experience, hearing or having heard Telecommunications 1 (+ Telecommunications 2 in case of master seminar) is strongly recommended.


Programmieren für Ingenieure

Der überwiegende Teil der Ingenieursarbeit besteht aus “Software” im weitesten Sinne. Schaltkreise werden in SW entwickelt (simuliert und anschließend synthetisiert), Schaltungen in SW erstellt (computer-unterstütztes Layout und automatische Bestückung) und Endgeräte (Mobiltelefone, PCs/Notebooks, Settop-Boxen) nutzen oft weltweit einheitliche Schaltkreise und unterscheiden sich in der Cleverness der Systemsoftware.

Die Vorlesung PfI bietet einen Einstieg für Ingenieure in das Programmieren an sich und die Programmiersprache C++ im Besonderen. Neben den notwendigen Werkzeugen (Editor, Compiler, Linker, Librarian, Debugger, Make, Revision Control, integrierte Entwicklungsumgebung) wird die Programmiersprache C++ aus Sicht der objektorientierten Programmierung vermittelt.

Im Laufe der Vorlesung wird ein Projekt durchgeführt, in welchem über Fourier-Transformationen (sehr wichtig für Ingenieure) verschiedene Sprecher in einem Audiosignal getrennt werden sollen. Ausgangsmaterial sind die Empfangssignale der beiden Ohren eines Menschen (in unserem Falle eines mit Mikrofonen ausgestatteten Kunstkopfes). Ergebnis sind die separierten Signale der einzelnen Sprecher. Objektorientierte Programmierung in C++ wird an Hand dieses Projektes vorgestellt und in Übungen sowie einem Übungsprojekt praktisch erlernt.

Voraussetzung: Da PfI im Nebenfach für Ingenieure angeboten wird, sind keine speziellen Vorkenntnisse notwendig. Wie bei allen Modulen ist eine solide Kenntnis in der Anwendung von PCs (Betriebssysteme, SW-Installation, Anwendungsprogramme etc.) unumgänglich. Erste Erfahrungen in der Programmierung (z. B. Makro-Programmierung in Visual Basic oder die “Programmierung” von HTML-Seiten) sind sehr wünschenswert.


Main Seminar: “Quality of Service in Local Area Networks”

The seminar will introduce modern technologies for managing network traffic (multimedia and non-multimedia) within home and office networks. Special attention will be given to technologies for delivering network services within the wireless networks. The rapid evolution of radio technologies makes wireless networks more and more popular for home and office use. The variety of potential applications over wireless includes audio and video streaming, gaming, mp3 music download, video and audio conferencing, file sharing and transfer, etc. As these applications are deployed over wireless networks, Quality of Service (QoS) mechanisms will be needed to cope with instability of the wireless channel and to distinguish between traffic flows that are competing for different resources on the network. QoS is a set of technologies for managing network traffic in a cost effective manner to improve overall user experiences. For instance, QoS allows a user to prioritize individual services. An example is video streaming that uses QoS to guarantee enough bandwidth and to make it possible to deliver high-quality video.

Purpose: The seminar will make you familiar with the modern technologies required for distributing multimedia and non-multimedia content within the home networks. You will gain a research experience in working on a specific subject with your supervisor, writing a report and making an oral presentation.

Required Education: Seminar credit points account for your main study period. Therefore Bachelor / Vordiplom is recommended.


Advanced lecture: Telecommunications II / “Audio/Visual Communications & Networks”
(Nachrichtentechnik II / Digitale Kommunikationsnetze)

Remark: The course will be given in English in case this will be recommended by the participants in the first lesson.

Audio/Visual Communications & Networks will deepen your knowledge on modern communications systems. It will focus on wireless systems since from a telecommunications perspective the combination of audio/visual data – meaning inherently high data rate and putting high requirements on the realtime capabilities of the underlying network – and wireless transmission – that is unreliable and highly dynamic with respect to the channel characteristics and its capacity – is the most demanding application domain.

The lecture will build on the foundation layed as well in “Signals and Systems / Signale und Systeme” as in “Digital Transmission and Signal Processing / Digitale Übertragungstechnik und Signalverarbeitung” and it will apply the building blocks introduced there onto the various communications systems. The course will aim at being self-contained, however, it will not be able to repeat basic mathematical concepts and tools introduced in Telecommunications I.

As the basic principle the course will study and introduce the building blocks of wireless communication systems. Multiple access schemes like TDMA, FDMA, CDMA and SDMA are introduced, antennas and propagation incl. link budget calculations are dealt with and more advanced channel models like MIMO are investigated. Modulation and error correction technologies presented in Telecommunications I will be expanded by e.g. turbo coding and receiver architectures like RAKE and BLAST will be introduced. A noticable portion of the lecture will present existing and future wireless networks and their extensions for audio/visual data. Examples include 802.11 (with the TGe Quality of Service extensions), 802.16a and the terrestrial DVB system (DVB-T, DVB-H).

Required Education: “Audio/Visual Communications & Networks” is a course during the main study period and by such requires a solid foundation of mathematics (differential and integral calculus) and probability theory. The course will build on the mathematical concepts and tools tought in Telecommunications I while trying to enable everyone to follow and to fill gaps by an accelerated study of the accompanying literature. “Signals and Systems” as well as “Digital Transmission and Signal Processing” are strongly recommended but not required.