Foto von Lukas Holzbaur

M.Sc. Lukas Holzbaur

Technische Universität München

Professur für Coding for Communications and Data Storage (Prof. Wachter-Zeh)

Postadresse

Postal:
Theresienstr. 90
80333 München

Biografie

I received my bachelor's degree at the Technical University of Munich (TUM) in 2014, completing my thesis at the Chair of Security in Information Technology. The focus of my studies was on security and design of integrated circuits. Through the Erasmus program I spent one semester in Dublin, attending the University College Dublin (UCD).

During the master studies my interests shifted towards coding and information theory. In 2017 I received my master's degree at TUM, completing my thesis at the Institute for Communications Engineering.

Since 2017 I am a research assistant at the Institute for Communications Engineering in the group Coding for Communications and Data Storage of Prof. Dr.-Ing. Antonia Wachter-Zeh.

Abschlussarbeiten

Angebotene Abschlussarbeiten

Masterarbeiten

Simulation of Improved Staircase Code Decoding

Simulation of Improved Staircase Code Decoding

Beschreibung

Staircase codes, as introduced in 2011 by Smith et. al. [1], are a hardware friendly code design for error correction in optical communication systems. However, the choices of parameters such as block size and code rate that achieve a desired output bit error rate are limited by the error floor of the decoder. A new and improved decoder has been devised [2], allowing for staircase codes with a scope of new parameters to be considered for optical communication. While estimations show the significant improvements, the high throughput required to simulate the error floor can only be achieved with an efficient and parallelisable implementation. The main goal of the thesis is the implementation  in VHDL and simulation on an FPGA of the new decoder  in order to provide further evidence for the estimated performance.

[1] https://arxiv.org/abs/1201.4106
[2] https://arxiv.org/abs/1704.01893

Voraussetzungen

interest in channel coding, knowledge in VHDL

Betreuer:

Forschungspraxis oder MSCE Forschungspraxis

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:

Laufende Abschlussarbeiten

Masterarbeiten

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, Sven Puchinger

Student

Hedongliang Liu

Forschung

Coding for Distributed Data Storage

The vast amount of data required for todays online services has to be stored efficiently and reliantly. Most service providers have already made the transition from the naive solution of data duplication to employing more efficient codes (e.g. Reed-Solomon codes) for recovering failed servers by treating them as erasures (e.g. Facebook uses a [14,10] RS code). While this method is optimal in terms of storage overhead, recovery from failures requires large amounts of data to be transfered from many servers, making the process expensive in terms of bandwidth and number of participating servers. Coding solutions designed for distributed data storage allow for a better trade-off between these values, decreasing the repair cost while keeping storage overhead low.

Publikationen

2018

  • Holzbaur, L.; Bartz, H.; Wachter-Zeh, A.: Improved Decoding and Error Floor Analysis of Staircase Codes. Designs, Codes and Cryptography, 2018 mehr…
  • Holzbaur, L.; Freij-Hollanti, R.; Wachter-Zeh, A.; Hollanti, C.: Private Streaming with Convolutional Codes. IEEE Information Theory Workshop (ITW) 2018, Nov 2018 mehr…
  • Liu, L.; Holzbaur, L.; Wachter-Zeh, A.: Locality in Crisscross Error Correction. Sixteenth International Workshop on Algebraic and Combinatorial Coding Theory (ACCT), Sep 2018 mehr…
  • Holzbaur, L.; Wachter-Zeh, A.: List Decoding of Locally Repairable Codes. IEEE Int. Symp. Inform. Theory (ISIT), Jun 2018 mehr…
  • Hedongliang Liu, Lukas Holzbaur, Antonia Wachter-Zeh: Locality in Crisscross Error Correction. Munich Doctoral Seminar on Communications 2018, 2018 mehr…
  • Holzbaur, L.; Lenz, A.; Wachter-Zeh, A.: Coding for Reliable Data Storage. TUM-IAS General Assembly, 2018 mehr…
  • Holzbaur, L.; Wachter-Zeh, A.: List Decoding of Locally Repairable Codes. Munich Workshop on Coding and Cryptography 2018, 2018 mehr…
  • Lukas Holzbaur: Private Streaming with Convolutional Codes. Munich Doctoral Seminar on Communications 2018, 2018 mehr…

2017

  • Holzbaur, L., Bartz, H., Wachter-Zeh, A.: Improved Decoding and Error Floor Analysis of Staircase Codes. The 4th International Professor’s Day on ICT Algorithm Design (ICTAD-2017), 2017 mehr…
  • Holzbaur, L.; Bartz, H.; Wachter-Zeh, A: Improved Decoding of Staircase Codes. Joint Workshop on Communications and Coding (JWCC), 2017 mehr…
  • Holzbaur, L.; Bartz, H., Wachter-Zeh, A.: Improved Decoding and Error Floor Analysis of Staircase Codes. Tenth International Workshop on Coding and Cryptography (WCC), Sep 2017 mehr…

2015

  • Wamser, Markus Stefan; Holzbaur, Lukas; Sigl, Georg: A Petite and Power Saving Design for the AES S-Box. 2015 Euromicro Conference on Digital System Design, IEEE, 2015 mehr… Volltext ( DOI )