Information Theoretic Distance Measures in (2009)
Pavol Hanus, Janis Dingel, Juergen Zech, Joachim Hagenauer, Jakob C. Mueller
Abstract — A variety of distance measures has been developed in information theory, proven useful in the application to digital information systems. According to the fact, that the information for...
Sequential Decoding for Mobile Receivers (2009)
Joachim Hagenauer, Christian Kuhn, Student Member
Currently many classical detection and decoding algorithms receive new attention in mobile communications. Amongst those classics are low density parity check codes [1], concatenated codes [2],...
GENE CLUSTERING USING INDEPENDENT COMPONENT ANALYSIS (2009)
Michel Sarkis, Zaher Dawy, Joachim Hagenauer, Jakob C. Müller
Linkage disequilibrium has gained a lot of attention recently since it can be effectively utilized in various problems in the field of statistical genetics, for example gene mapping and evolutionary...
A novel gene mapping algorithm based on independent component analysis (2009)
Zaher Dawy, Michel Sarkis, Joachim Hagenauer, Jakob Mueller
Identifying the causal genetic markers responsible for complex diseases is a main aim in human genetics. In the context of complex diseases, which are believed to have multiple causal loci of largely...
Turbo Base-Station Cooperation for Intercell Interference Cancellation (2009)
Timo Mayer, Hrvoje Jenkač, Joachim Hagenauer
Abstract — Interference cancellation is an important issue since the coverage and capacity in the uplink are mainly interference limited. The interference from the own cell can be mitigated by...
Modeling and Analysis of Gene Expression Mechanisms: A Communication Theory Approach (2009)
Zaher Dawy, Faruck Morcos González, Joachim Hagenauer, Jakob C. Mueller
Abstract — The increase in the availability of genetic data in the last years is prompting the efforts to use tools from communications engineering for the understanding of genetic information....
1 An Alternative Method for Detecting Conserved Elements in Multiple Sequence Alignments (2009)
Pavol Hanus, Janis Dingel, Joachim Hagenauer, Jakob C. Mueller
Abstract — We present an alternative method for detecting conserved regions in multiple sequence alignments. In contrast to earlier approaches, we avoid using assumptions about neutral substitution...
Molecular Genetics · Classification (2009)
Pavol Hanus, Bernhard Goebel, Janis Dingel, Johanna Weindl, Juergen Zech, Zaher Dawy, ...
Abstract The DNA sequencing efforts of the past years together with rapid progress in sequencing technology have generated a huge amount of sequence data available in public molecular databases. This...
Special Issue The turbo-fountain (2008)
Hrvoje Jenkač, Joachim Hagenauer, Timo Mayer
Reliable wireless broadcast with asynchronous data access based on fountain coding is investigated. We review the traditional problem formalisation for fountain codes operating on erasure channels,...
Local conservation scores without a priori assumptions on neutral substitution rates (2008)
Dingel, Janis, Hanus, Pavol, Leonardi, Niccolò, Hagenauer, Joachim, Zech, Jürgen, Mueller, Jakob C
Abstract Background Comparative genomics aims to detect signals of evolutionary conservation as an indicator of functional constraint. Surprisingly, results of the ENCODE project revealed that about...
Implementing the context tree weighting method for context recognition (2008)
Zaher Dawy, Joachim Hagenauer, Andreas Hoffmann
The context tree weighting method (CTW) is a statistics–based universal date compres-sion algorithm that is capable of achieving superior performance compared to Lempel– Ziv based algorithms [1],...
The List-Sequential (LISS) Algorithm and (2008)
Joachim Hagenauer, Christian Kuhn, Student Member
its Application
Lehrstuhl Für Nachrichtentechnik, Prof Dr. -ing, Joachim Hagenauer, Tiago José, Espinha Mendonça Gasiba, ...
over GERAN based on Outer
Coding for a CDMA-System with Higher User Data Rates by Combining Several Traffic Channels (2008)
Reinhard Jungbauer, Rupert Herzog, Andreas Schmidbauer, Joachim Hagenauer, Sven Riedel
In the downlink of a CDMA system (IS-95), combining several traffic channels provides the user with a higher data rate for future services. Besides the extended data rate, we achieve a large gain by...
Real-time Demonstration of MPEG-4 based Video Telephony over Wireless Systems using WiNe2 (2008)
Thomas STOCKHAMMER, Hrvoje Jenkac, Peter STRASSER, Günther LIEBL, Daniel PFEIFER, Joachim HAGENAUER, ...
In this work we present a flexible and fast, but yet accurate simulation environment for wireless systems, which satisfies realtime constraints imposed by the respective applications and protocols of...
Improving Channel Coding of the ETSI- and MPEG-Satellite Transmission Standards (2007)
Frank Burkert, Joachim Hagenauer
We propose the combination of two powerful decoding techniques in one concatenated coding scheme. Using 'turbo' codes as inner codes and block codes as outer codes and applying parallel and...
The Race to Shannon's Limit: Discipline High-Rate Codes (2007)
Joachim Hagenauer, Frank Burkert, Helmut Nickl
The Shannon capacity limit can be reached by less than 0.27 dB at a BER of 10 \Gamma5 by applying long but simple Hamming codes as component codes to an iterative `turbo'--decoding scheme. To...
Joachim Hagenauer, Melanie Witzke
In wireless and mobile communications the dimension of space is exploited. Information theory limits are now known and indicate the possibly achievable gains. Multiple antennas on the transmit and...
Source Encoder Channel 1 (2007)
The traditional formulation of the multiple description problem [1] is based on a two-channel communications system like the one shown in Figure 1. Two distinct yet correlated descriptions of the...
PACKET-LOSS PUNCTURED (PALOP) TURBO CODES FOR MULTIMEDIA DATA TRANSMISSION (2007)
Markus Kaindl, Joachim Hagenauer
A very flexible transmission system for multimedia over mobile internet is proposed. For a mobile internet scenario a combination of a lossy packet-switched network and a mobile network is assumed....
Smart versus Dumb Antennas (2007)
Gerhard Bauch, Joachim Hagenauer
Abstract | We compare two approaches to use multiple transmit antennas in an FEC coded wireless system: Smart antennas use an antenna array to direct a beam in the direction of the dominant...
to Turbo Equalization for 2 (2007)
Michael Tuchler, Joachim Hagenauer, Lehrstuhl Fur Nachrichtentechnik, Tu Munchen
For coded data transmission over channels introducing inter-symbol interference, one approach for joint equalization and decoding in the receiver is Turbo Equalization. We rederive existing linear...
Email: {firstname}.{lastname} @ ei.tum.de (2007)
Thomas Hindelang, Joachim Hagenauer, Stefan Heinen
Abstract-- In digital transmission of speech, audio, images and video signals residual redundancy is often left after source coding due to the complexity and delay constraints. This redundancy...
UNEQUAL ERROR PROTECTION (UEP) FOR STATISTICALLY (2007)
Joachim Hagenauer, Abt Nachrichtentheorie, Joachim Hagenaucr
lnstitut fir Nachrichtentechnik
ANNALS OF TELECOM 1 Turbo Processing in Transmit Antenna Diversity Systems (2007)
Gerhard Bauch, Joachim Hagenauer, Nambi Seshadri
We consider turbo-trellis-coded transmission over fading multiple-input-multiple-output (MIMO) channels with transmit diversity using space-time block codes. We give a new view on space-time block...
1 Regressive Channel Coding with Sequential Decoding for Embedded Source Coders (2007)
Joachim Hagenauer, Thomas Stockhammer, Christian Weiss
A channel coding system for strongly varying channels (mobile radio, Internet) unknown to the encoder is presented. It matches progressively coded sources (e.g., video, images, audio, speech) with...
Implementing the context tree weighting method for context recognition (2007)
Zaher Dawy, Joachim Hagenauer, Andreas Hoffmann
The context tree weighting method (CTW) is a competent statistics–based universal data com-pression algorithm proposed by Willems et al. in 1995. Motivated by the superior data compression...
Source model aided lossless turbo source coding (2006)
Nicolas Dütsch, Sebastian Graf, Javier García-frías, Joachim Hagenauer
The integration of a source model into lossless source coding based on punctured turbo codes is considered. We use the turbo principle to iteratively estimate the source statistics and to compensate...
Iterative Network and Channel Decoding for the Two-Way Relay Channel (2006)
Christoph Hausl, Joachim Hagenauer
Abstract — We introduce an extension of the relay channel that we call two-way relay channel. The two-way relay channel consists of two users which want to communicate to each other with the help...
Zaher Dawy, Joachim Hagenauer, Pavol Hanus, Jakob C. Mueller
Abstract — Possibilities of using mutual information for classification and content recognition are exploited. Two different mutual information based distance measures are proposed, one for...
Single antenna interference cancellation using a list-sequential (LISS) algorithm (2005)
Christian Kuhn, Joachim Hagenauer
Abstract — Coded transmission over channels introducing intersymbol interference in presence of a co-channel interferer and additive white Gaussian noise poses a problem for single antenna...
The Turbo-Fountain and its application to reliable wireless broadcast (2005)
Hrvoje Jenkač, Joachim Hagenauer, Timo Mayer
Abstract: Reliable wireless broadcast with asynchronous data access based on fountain coding is investigated. We review the traditional problem formalization for fountain codes operating on erasure...
Joint source-channel-fountain coding for asynchronous broadcast (2005)
Nicolas Dütsch, Hrvoje Jenkač, Timo Mayer, Joachim Hagenauer
Abstract — A novel concept of joint source-fountain coding for asynchronous wireless broadcast is presented. The traditional field of joint source-channel coding aims in both lossless data...
Lossless turbo source coding with decremental redundancy (2004)
Joachim Hagenauer, João Barros, Andrew Schaefer
Recent results indicate that the same turbo principle which delivers near to optimal strategies for channel coding, can be used to obtain very efficient source coding schemes. We investigate this...
Incremental and decremental redundancy in turbo source-channel coding (2004)
Joachim Hagenauer, Nicolas Dütsch, Joao Barros, Andrew Schaefer
For joint source channel coding we extend the concept of incremental redundancy to a combination of decremental and incremental redundancy in a parallel concatenated Turbo scheme. Even for...
PSK Turbo Equalization with the List-Sequential (LISS) Algorithm (2004)
Christian Kuhn And, Christian Kuhn, Joachim Hagenauer
Introduction We consider coded 8-PSK transmission over intersymbol interference channels with a long impulse response and employ a receiver performing iterative equalization and decoding. According...
An approximation to the distribution of finite sample size mutual information estimates (2004)
Bernhard Goebel, Zaher Dawy, Joachim Hagenauer, Jakob C. Mueller
Abstract — In this paper, the distribution of mutual information between two discrete random variables is approximated by means of a second-order Taylor series expansion. Approximative expressions...
Iterative list-sequential (LISS) detector for fading multiple-access channels (2004)
Christian Kuhn, Joachim Hagenauer
Abstract — We study a list-sequential (LISS) multiuser detector for coded applications in a turbo scheme. Optimal with respect to the bit error rate within that iterative scheme would be an APP...
Turbo equalization for channels with high memory using a list-sequential (LISS) equalizer (2003)
Joachim Hagenauer, Christian Kuhn
Abstract: For multipath channels with a high number of taps and signal constellation points the APP (BCJR) soft-in/soft-out detector in a turboscheme has a prohibitively high number of states. We...
The turbo principle in joint source-channel coding (2003)
Joachim Hagenauer, Norbert Görtz
Abstract — The turbo principle (iterative decoding between component decoders) is a general scheme, which we apply to joint source-channel decoding. As a realistic (e.g. speech parameter coding)...
Wine2 wireless network demonstration platform for ip-based real-time multimedia transmission (2003)
Thomas Stockhammer, Günther Liebl, Hrvoje Jenkac, Peter Strasser, Daniel Pfeifer, Joachim Hagenauer
Abstract — In this work we present a flexible and fast, but yet accurate simulation environment for wireless systems, which satisfies real-time constraints imposed by the respective applications...
Analog rotating ring decoder for an LDPC convolutional code (2003)
Andrew Schaefer, Matthias Moerz, Joachim Hagenauer, Arvind Sridharan, Daniel J. Costello
Abstract--- We present an analog rotating ring decoder for decoding an LDPC convolutional code. The decoder architecture uses a window of soft received L-values K time units in the past and K time...
Optimization of Symbol Mappings for Bit-Interleaved Coded Modulation with Iterative Decoding (2003)
Frank Schreckenbach, Student Member, Norbert Görtz, Joachim Hagenauer, Gerhard Bauch
We investigate bit-interleaved coded modulation with iterative decoding (BICM-ID) for bandwidth efficient transmission, where the bit error rate is reduced through iterations between a multilevel...
Real-time Demonstration of MPEG-4 based Video Telephony over Wireless Systems Using WiNe2 (2003)
Thomas Stockhammer, Hrvoje Jenkac, Peter Strasser, Gnther LIEBL, Daniel Pfeifer, Joachim HAGENAUER, ...
In this work we present a flexible and fast, but yet accurate simulation environment for wireless systems, which satisfies real-time constraints imposed by the respective applications and protocols...
Iterative Detection of Generalized Coded MIMO Signals using a Widely Linear Detector (2003)
Melanie Witzke, Stephan Bäro, Joachim Hagenauer
We investigate an iterative receiver with a linear detector for complex symbols to suppress the co-antenna interference introduced by a multiple input multiple output (MIMO) channel. For generalized...
Berichter Prof, Dr. Joachim Hagenauer
Code-Division-Multiple-Access (CDMA) ist ein Modulations- und Vielfachzugriffsverfahren basierend auf der Bandspreiztechnologie. Dabei findet die Signalübertragung mehrerer Teilnehmer zur gleichen...
Analysis Tools for Iterative Source-Channel Decoding (2003)
Andrew Schaefer Norbert, Norbert Görtz, Joachim Hagenauer
We consider the problem of transmitting a correlated Gaussian source over an AWGN channel. This paper contains two main contributions which aid in the design of such a system. We determine the...
Turbo cross decoding of multiple descriptions (2002)
Joao Barros, Joachim Hagenauer, Norbert Gortz
Abstract- The transmission of multimedia data over best-effort packet networks has recently motivated a strong research effort in the area of multiple description coding. While most contributions...
Analog Decoders and Receivers for High Speed Applications (2002)
Joachim Hagenauer, Matthias Moerz, Andrew Schaefer
Abstract — The ever increasing speed of data transmission especially in optical channels, in magnetic recording devices and in wireless links makes it necessary to look at new receiver structures...
Iterative detection of MIMO signals with linear detectors (2002)
Melanie Witzke, Stephan Bäro, Frank Schreckenbach, Joachim Hagenauer
We investigate an iterative receiver structure performing joint symbol detection and decoding to suppress the strong interference in multiple input multiple output (MIMO) systems. A linear minimum...
Multiple antenna systems: capacities, transmit diversity and turbo processing (2002)
Gerhard Bauch, Joachim Hagenauer
Abstract | We give an introduction to wireless systems with multiple transmit and receive antennas. Using multiple antenna systems is motivated by results on the capacity of...
The turbo principle in mobile communications (2002)
This overview talk shows that the so-called turbo codes(decoders) entail a much broader principle. It discusses how the feedback of extrinsic information which we call the turbo principle can be used...
The Turbo principle in joint source channel decoding of variable length codes (2001)
Abstract — The ’turbo ’ principle has been widely applied to various detection/decoding problems in recent years. Here we show how the general idea can be extended to a communication scheme...
Analytical evaluation of space-time transmit diversity with FEC-coding (2001)
Gerhard Bauch, Joachim Hagenauer
Abstract | We consider FEC coded transmit diversity with space-time block codes. We show that all space-time block codes are equivalent in terms of SNR per bit and give a new view on space-time block...
The Turbo principle in joint source channel decoding of variable length codes (2001)
Joachim Hagenauer, Rainer Bauer
Abstract--- The 'turbo ' principle has been widely applied to various detection/decoding problems in recent years. Here we show how the general idea can be extended to a communication...
On variable length codes for iterative source/channel decoding (2001)
Rainer Bauer, Joachim Hagenauer
We focus on a trellis-based decoding technique for variable length codes (VLCs) which does not require any additional side information besides the number of bits in the coded sequence. A bit-level...
On variable length codes for iterative source/channel decoding (2001)
Rainer Bauer, Joachim Hagenauer
We focus on a trellis-based decoding technique for variable length codes (VLCs) which does not require any additional side information besides the number of bits in the coded sequence. A bit-level...
Channel Coding Techniques for Adaptive Multi-Rate Speech Transmission (2000)
Thomas Hindelang, Joachim Hagenauer, Max Schmautz, Wen Xu
Abstract--A variable channel coding scheme for Adaptive Multi Rate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM (Global System for Mobile...
Analog turbo-networks in VLSI: The next step in turbo decoding and equalization (2000)
Joachim Hagenauer, Matthias Moerz, Elke Offer
Abstract: Turbo decoding is a step towards ana-log because it uses soft-in/soft-out decoders. The next step is to go fully analog by exchanging extrinsic in-formation in continuous time...
Progressive Source Coding Combined with Regressive Channel Coding on Varying Channels (2000)
Joachim Hagenauer, Thomas Stockhammer, Christian Weiss, Anton Donner
Abstract | A channel coding system for strongly varying channels (mobile radio, Internet) unknown to the encoder is presented. It matches progressively coded sources (e.g., video, images, audio,...
Progressive Source Coding Combined with Regressive Channel Coding on Varying Channels (2000)
Joachim Hagenauer, Thomas Stockhammer, Christian Wei, Anton Donner
Abstract | A channel coding system for heavily varying channels (mobile radio, Internet) unknown to the encoder is presented. It matches progressively coded sources (e.g., video, images, audio,...
Iterative Source/Channel-Decoding Using Reversible Variable Length Codes (2000)
Rainer Bauer, Joachim Hagenauer
In this paper we describe a trellis representation of variable length coded data which is capable of being used for bit-level or symbol-level maximum a posteriori (MAP) decoding of variable length...
Symbol-by-Symbol MAP Decoding of Variable Length Codes (2000)
Rainer Bauer, Joachim Hagenauer
| In this paper we introduce a new approach in the decoding of variable length codes. Based on the tree structure of these codes a trellis representation is derived which allows the application of...
A Circuit-Based Interpretation of Analog MAP Decoding with Binary Trellises (2000)
Joachim Hagenauer, Matthias Mörz, Elke Offer
The maximum a posteriori (MAP) decoding algorithm for convolutional codes is reformulated in terms of probabilities and log-likelihood ratios. This is shown to be a precise circuit description of an...
Improved Channel Coding and Estimation for Adaptive Multi Rate (AMR) Speech Transmission (2000)
Thomas Hindelang, Markus Kaindl, Joachim Hagenauer, Max Schmautz, Wen Xu
| A variable channel coding scheme for Adaptive Multi Rate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM, the basic concept of variable...
Turbo-TCM and Transmit Antenna Diversity in Multipath Fading Channels (2000)
Gerhard Bauch, Joachim Hagenauer, Nambi Seshadri
We consider turbo-trellis-coded transmission over fading MIMO channels with transmit diversity using space-time block codes. We give a new view on space-time block codes as a transformation of the...
Progressive Source Coding Combined with Regressive Channel Coding on Varying Channels (2000)
Joachim Hagenauer, Thomas Stockhammer, Christian Weiss, Anton Donner
A channel coding system for strongly varying channels (mobile radio, Internet) unknown to the encoder is presented. It matches progressively coded sources (e.g., video, images, audio, speech) with...
Channel Coding and Transmission Aspects for Wireless Multimedia (1999)
Joachim Hagenauer, Fellow Ieee, Thomas Stockhammer, Member Ieee
Multimedia transmission has to handle a variety of compressed and uncompressed source signals such as data, text, image, audio, and video. On wireless channels the error rates are high and joint...
Channel Coding and Transmission Aspects for Wireless Multimedia (1999)
Joachim Hagenauer, Fellow Ieee, Thomas Stockhammer, Member Ieee
Multimedia transmission has to handle a variety of compressed and uncompressed source signals such as data, text, image, audio, and video. On wireless channels the error rates are high and joint...
Decoding and Equalization with Analog Non-linear Networks (1999)
Joachim Hagenauer, Elke Offer, Cyril Méasson, Matthias Mörz, Matthias M Orz
. Using analog, non-linear and highly parallel networks, we attempt to perform decoding of block and convolutional codes, equalization of certain frequency-selective channels, decoding of multi-level...
A Serial Concatenated Coding Scheme with Iterative 'Turbo'- and Feedback Decoding (1997)
Frank Burkert, Joachim Hagenauer
We propose the combination of two powerful decoding techniques in one concatenated coding scheme. Using 'turbo' codes as inner codes and block codes as outer codes and applying parallel and...
Rupert Herzog, Andreas Schmidbauer, Joachim Hagenauer
: Iterative decoding is applied to code division multiple access (CDMA) systems with two-stage serial concatenated channel coding. For a direct sequence (DS) CDMA system like in the uplink of the...
Iterative Equalization and Decoding in Mobile Communications Systems (1997)
Gerhard Bauch, Hourman Khorram, Joachim Hagenauer
In iterative equalization and decoding the "turbo--principle" is used for iterative detection of coded data transmitted over a frequency selective channel. We view channel encoder and...
Soft Decision MAP Decoding of Binary Linear Block Codes via Global Optimization (1997)
Stefan Schäffler, Joachim Hagenauer
This paper presents a stochastic method for soft decision decoding of binary linear block codes. An efficient algorithm is developed and investigated based on a special nonlinear regression model....
Multi-Carrier CDMA with Iterative Decoding and Soft-Interference Cancellation (1997)
Stefan Kaiser, Joachim Hagenauer
A novel multi-user detection scheme applying iterative softinterference cancellation in multi-carrier code division multiple access (MC-CDMA) systems is proposed and investigated. The novel detection...
Helmut Nickl, Joachim Hagenauer, Frank Burkert
The Shannon capacity limit can be reached by less than 0.27 dB at a BER of 10 \Gamma5 by applying long but simple Hamming codes as component codes to an iterative `turbo'--decoding scheme. In...
"Turbo" Decoding with Unequal Error Protection applied to GSM speech coding (1996)
Frank Burkert, Giuseppe Caire, Joachim Hagenauer, Thomas Hindelang, Guenther Lechner
Two-dimensional, systematic and parallel concatenated convolutional codes are compatibly punctured in order to provide unequal error protection (UEP). They are iteratively decoded by the MAP...
To Compress Or Not to Compress? (1996)
Gabriele Buch, Frank Burkert, Joachim Hagenauer, Bernhard Kukla
For practical communications which transmit finite blocks of source data over noisy channels, we question the common practice to compress (C) the source and then to add redundancy for error control....
Iterative decoding of binary block and convolutional codes (1996)
Joachim Hagenauer, Elke Offer, Lutz Papke
Abstract- Iterative decoding of two-dimensional systematic convolutional codes has been termed “turbo ” (de)coding. Using log-likelihood algebra, we show that any decoder can he used which...
Fehler beim Abtasten und Wiederherstellen bandbegrenzter Signale / (1974)
Thesis (doctoral)--Technische Hochschule Darmstadt, 1974.
Weindl, Johanna, Hanus, Pavol, Dawy, Zaher, Zech, Juergen, Hagenauer, Joachim, Mueller, Jakob C.
We present a computational model of DNA-binding by σ70 in Escherichia coli which allows us to extract the functional characteristics of the wider promoter environment. Our model is based on a...