Persönlicher Status und Werkzeuge

Bernhard Geiger

Bernhard Geiger

Bernhard Geiger
Senior Researcher

Institute for Communications Engineering
Theresienstrasse 90
Building N4, 3. Floor
D-80333 Munich

Room: N3409
Phone: +49 89 289-23452
Email: bernhard.geigernoSpamAllowed@tum.de

Biography

I was born in Graz, Austria, in April 1984, where I studied Electrical Engineering with focus on Communications between 2004 and 2009 at Graz University of Technology. After receiving my Dipl.-Ing. in November 2009, I joined the Signal Processing and Speech Communication Lab (SPSC) as a project assistant, working on a software-defined GPS receiver. In 2010 I started my PhD thesis, taking a position as a research & teaching associate in the lab. After graduating in June 2014, I joined the Institute of Communications Engineering in November 2014.

My h-factor (as of August 2015) is 5 (excluding self citations). My Erdös number is 3, thanks to a joint "publication" with Wolfgang Woess in the Research News of Graz University of Technology.

In my leisure time (or during the commute to and from work) I enjoy reading a good book. My other hobbies are running, Geocaching, and playing Go (~15 kyu; you can challenge me - sliver1984 - at DGS).

Research

Already during my PhD, in which I investigated the information loss in deterministic systems, I became increasingly interested in state space reduction for Markov chains. Based on a results obtained together various collaborators (Christoph Temmel, Tatjana Petrov, Heinz Koeppl), during the next few years I would like to continue deveoping information-theoretic methods for state space reduction for Markov and hidden Markov models.

Links

For my most recent publications, please take a look at 

My PhD thesis can be downloaded from the EURASIP database.

If you are interested in my teaching experience, you can either visit my old website at the SPSC Lab (incomplete) or request a detailled CV!

Theses in Progress


Aya Ben Salha: Bachelor Thesis - n-Markov Language Generator
The aim of the thesis is to build a program that learns a language based on plain text and generates a markov chain that can be used for imitating language. Language can be german, english or symphonies.
Supervisors: Patrick Schulte, Bernhard Geiger

Anes Belkacem: Bachelor Thesis - Reliability Analysis for Secret-key Binding for Physical Identifiers
Secret-key binding for Physical Unclonable Functions (PUFs) is a promising technique to provide security to Internet of Things (IoT) rather than storing a key in Non-volatile Memory (NVM). Key-binding schemes using PUFs require an error-correction step due to the noisy nature of PUF outputs. The PUF post-processing scheme that uses the Discrete Cosine Transform (DCT) to decorrelate the source is a suboptimal but efficient approach. The DCT-based scheme uses an algorithm to satisfy the secrecy and reliability constraints simultaneously by optimizing a reliability metric for each DCT coefficient so that a certain block error probability can be achieved for the secret-key by using a linear block code. This thesis aims to find a better reliability metric to give performance guarantees to extract a fixed number of bits. Real PUF outputs will be used to determine the source and channel models for the DCT-based scheme and to check the security and reliability performance of the scheme with the new metric.
Supervisors: Onur Günlü, Bernhard Geiger

Clemens Bloechl: Master Thesis - 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.
Supervisors: Bernhard Geiger

Edward Wall: Forschungspraxis (12 ECTS) - 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.
Supervisors: Bernhard Geiger

Muhammad Firas Hammosh: Forschungspraxis (12 ECTS) - 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.
Supervisors: Bernhard Geiger

Muhammad Umer Anwaar: MSCE Internship - 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.
Supervisors: Ali Amjad, Bernhard Geiger

Publications

2017

2016

2015

2014