Publications associées à Low-Density Codes Based on Chaotic Systems for Low-Density Codes Based on Chaotic Systems for Simple Encoding

Weight Distribution of Low-Density Parity-Check Codes

We derive the average weight distribution function and its asymptotic growth rate for low-density parity-check (LDPC) code ensembles. We show that the growth rate of the minimum distance of LDPC codes depends only on the degree distribution pair. It turns ...

2006

Computational Hardness and Explicit Constructions of Error Correcting Codes

Mohammad Amin Shokrollahi, Mahdi Cheraghchi Bashi Astaneh

We outline a procedure for using pseudorandom generators to construct binary codes with good properties, assuming the existence of sufficiently hard functions. Specifically, we give a polynomial time algorithm, which for every integers

n

and

k

, constru ...

2006

Posterior Based Keyword Spotting with A Priori Thresholds

Hervé Bourlard, Samy Bengio, Hamed Ketabdar

In this paper, we propose a new posterior based scoring approach for keyword and non keyword (garbage) elements. The estimation of these scores is based on HMM state posterior probability definition, taking into account long contextual information and the ...

2006

Posterior Based Keyword Spotting with A Priori Thresholds

Hervé Bourlard, Samy Bengio, Hamed Ketabdar

In this paper, we propose a new posterior based scoring approach for keyword and non keyword (garbage) elements. The estimation of these scores is based on HMM state posterior probability definition, taking into account long contextual information and the ...

IDIAP2006

JPWL - an Extension of JPEG 2000 for Wireless Imaging

In this paper, we present an overview of the JPWL standardization activity. JPWL is an extension of JPEG 2000 for the efficient transmission of JPEG 2000 images over an error-prone wireless network. More specifically, JPWL supports a set of tools for error ...

IEEE2006

Wireless Image Transmission Using Turbo Codes and Optimal Unequal Error Protection

Nikolaos Thomos

A novel image transmission scheme is proposed for the communication of SPIHT image streams over wireless channels. The proposed scheme employs turbo codes and Reed-Solomon codes in order to deal effectively with burst errors. An algorithm for the optimal u ...

Institute of Electrical and Electronics Engineers2005

Improved Decoding of Interleaved AG-Codes

Mohammad Amin Shokrollahi, Lorenz Minder, Andrew Brown

We analyze a generalization of a recent algorithm of Bleichenbacher et al.~for decoding interleaved codes on the

Q

-ary symmetric channel for large

Q

. We will show that for any

m

and any

\epsilon

the new algorithms can decode up to a fraction of at ...

2005

Asymptotic and finite-length analysis of low-density parity-check codes

Changyan Di

This thesis addresses the topic of Low-Density Parity-Check (LDPC) code analysis, both asymptotically and for finite block lengths. Since in general it is a difficult problem to analyze individual code instances, ensemble averages are studied by following ...

EPFL2004

Concatenated codes for block-fading channels

Albert Guillén i Fàbregas

In this thesis we study coding strategies for single-user block-fading channels. The block-fading channel is a simplified model of slowly varying wireless communication channels with stringent delay constraints. This model is particularly important in prac ...

EPFL2004

Low-density parity-check codes with rates very close to the capacity of the q-ary symmetric channel for large q

Mohammad Amin Shokrollahi

Transmission of packets over computer networks is subject to packet-level errors, which appear as "bursts" of bit-level errors and are not well modeled by memoryless binary channels. A standard scrambling technique is used for transmission of packets by th ...

2004

Low-Density Codes Based on Chaotic Systems for Low-Density Codes Based on Chaotic Systems for Simple Encoding

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Weight Distribution of Low-Density Parity-Check Codes

Computational Hardness and Explicit Constructions of Error Correcting Codes

Posterior Based Keyword Spotting with A Priori Thresholds

Posterior Based Keyword Spotting with A Priori Thresholds

JPWL - an Extension of JPEG 2000 for Wireless Imaging

Wireless Image Transmission Using Turbo Codes and Optimal Unequal Error Protection

Improved Decoding of Interleaved AG-Codes

Asymptotic and finite-length analysis of low-density parity-check codes

Concatenated codes for block-fading channels

Low-density parity-check codes with rates very close to the capacity of the q-ary symmetric channel for large q

Weight Distribution of Low-Density Parity-Check Codes

Posterior Based Keyword Spotting with A Priori Thresholds

Wireless Image Transmission Using Turbo Codes and Optimal Unequal Error Protection

Concatenated codes for block-fading channels

Low-density parity-check codes with rates very close to the capacity of the q-ary symmetric channel for large q

JPWL - an Extension of JPEG 2000 for Wireless Imaging

Asymptotic and finite-length analysis of low-density parity-check codes

Computational Hardness and Explicit Constructions of Error Correcting Codes

Improved Decoding of Interleaved AG-Codes

Posterior Based Keyword Spotting with A Priori Thresholds