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Efficient near-optimum softbit source decoding for sources with inter- and intra-frame redundancy

Efficient near-optimum softbit source decoding for sources w...

引用

International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： M. Adrat J.-M. Picard P. Vary Institute of Communication Systems and Data Processing Aachen University Germany

The source codec parameters determined by modern speech, audio, or video encoders are, especially at high compression rates, highly sensitive to transmission errors and they usually exhibit natural residual redundancy due to delay and complexity limitations in the encoding process. Error concealment techniques like softbit source decoding (SBSD) utilize the residual redundancy as a priori knowledge for parameter estimation. Therewith, the annoying artifacts of transmission errors can considerably be concealed. But, the optimal utilization of all terms of residual redundancy requires large computational complexity. In this paper, we derive a new efficient, nearly optimal version to SBSD. Significant complexity savings become possible by exploiting the intra-frame and inter-frame redundancy separately using two nested forward-backward algorithms. Compared to the optimal joint evaluation, the performance loss is negligibly small.

关键词： Decoding Redundancy Speech processing Speech codecs Video compression Delay Encoding Parameter estimation Computational complexity Performance loss

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Source optimized channel codes (SOCCs) for parameter protection

Source optimized channel codes (SOCCs) for parameter protect...

引用

IEEE International Symposium on Information Theory

作者： S. Heinen P. Vary Institute of Communications Systems and Data Processing RWTH Aachen University of Technology Aachen Germany

We present a new class of channel codes, which we call source optimized channel codes (SOCCs). These non-linear codes are designed to maximize a given analogue quality measure in consideration of source and channel st... 详细信息

关键词： Protection Decoding Vectors Channel coding Speech coding Error correction codes Parameter estimation data processing Statistics Error analysis

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A Symmetric Two Microphone Speech Enhancement System Theoretical Limits and Application in a Car Environment

A Symmetric Two Microphone Speech Enhancement System Theoret...

引用

IEEE Digital Signal processing Workshop

作者： R. Martin P. Vary Institute for communication Systems and Dada Processing RWTH Aachen University of Technology Aachen Germany

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Feature selection for improved bandwidth extension of speech signals

Feature selection for improved bandwidth extension of speech...

引用

International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： P. Jax P. Vary Institute of Communication Systems and Data Processing (IND) Aachen University Aachen Germany

The aim of artificial bandwidth extension (BWE) is to convert speech signals with "standard telephone" quality (frequencies up to 3.4 kHz) into 7 kHz wideband speech. The principal key to high quality BWE is the estimation of the spectral envelope of the wideband speech. In general, this estimation of the wideband spectral envelope is based on a number of features that are extracted from the narrowband input speech signal. We investigate potential features and evaluate their suitability for the BWE application. The quality of each feature is quantified in terms of the statistical measures of mutual information and separability. It turns out that the best BWE results are obtained by using a large feature "super-vector" (/spl rarr/ high mutual information) which is subsequently reduced in dimension by a linear discriminant analysis (/spl rarr/ large separability). This solution also helps to reduce the computational complexity of the estimation of the wideband spectral envelope.

关键词： Bandwidth Speech Wideband Mutual information Telephony Frequency conversion Feature extraction data mining Narrowband Linear discriminant analysis

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A new architecture for mobile radio with macroscopic diversity and overlapping cells

A new architecture for mobile radio with macroscopic diversi...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio communications (PIMRC)

作者： S. Zurbes W. Papen W. Schmidt Institute for Communication Systems and Data Processing RWTH Aachen University of Technology Aachen Germany Ardkeenagh Boyle Company Roscommon Ireland

A new mobile radio cell architecture is presented that reduces interferences, increases system capacity, improves transmission quality and allows uncritical handoffs. Two main features characterize our proposal: macroscopic diversity supply of mobiles by means of three base stations which leads to high carrier-to-interference ratios and link quality improvement, and overlapping cells, thereby introducing large handoff zones. This system is ideally suited for existing GSM-style digital cellular networks and allows a traffic capacity increase due to a frequency re-use factor of 3.

关键词： Land mobile radio Base stations Frequency Interference Antennas and propagation communications technology data processing Proposals Land mobile radio cellular systems Telecommunication traffic

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Embedded speech coding based on pyramid CELP

Embedded speech coding based on pyramid CELP

引用

IEEE Workshop on Speech Coding Proceedings

作者： C. Erdmann P. Vary Institute of Communication Systems and Data Processing Aachen University of Technology Aachen Germany

In this paper we investigate embedded coding of speech in the CELP (code-excited-linear-prediction) framework. Compared to other known approaches of variable bit rate speech coding, such as the adaptive multi-rate (AMR) codec, embedded coding systems allow bit rate reductions at any point along the communication network, without changes of the encoder and the decoder. Thus, the quality of the decoded speech increases with the amount of received bits. Aiming at a coding scheme, that produces such a hierarchically-structured bit stream, we focus on a decomposition of the excitation signal by means of pyramid coding. To achieve reasonable speech compression, analysis-by-synthesis (AbS) based quantization of the pyramid layers is designed in a CELP-type fashion, called P-CELP (pyramid CELP). Besides an efficient design of fixed algebraic codebooks in each pyramid layer, special attention is payed to the integration of an adaptive codebook. To achieve maximum performance, the proposed coding scheme is used for wideband (50 Hz-7 kHz) speech.

关键词： Speech coding Image coding Decoding Gaussian processes Bit rate data processing Speech processing Codecs Quantization Wideband

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De-correlation distance of the large scale parameters in an urban macro cell scenario

De-correlation distance of the large scale parameters in an ...

引用

European Conference on Antennas and Propagation, EuCAP

作者： Annika Böttcher Peter Vary Christian Schneider Reiner S. Thomä Institute of Communication Systems and Data Processing RWTH Aachen University Aachen Germany Institute of Information Technology Technical University Ilmenau Ilmenau Germany

The investigation of new channel models plays a fundamental role for designing and evaluating wireless communication systems. Therefore an extensive analysis of channel measurement data is indispensable. Besides the knowledge of the parameters and their distribution functions, the distance where the parameters are getting uncorrelated is of great interest and can be exploited for more realistic channel simulations. In this contribution the de-correlation distance of the large scale parameters (LSP) in the power and delay domain is investigated. Different parameter estimation procedures are applied taking the changing automatic gain control (AGC) level within one MIMO snapshot into account. The AGC level changes strongly depending on the channel environment and due to the spatial filtering of the directional antennas. Additionally, different antenna heights are considered.

关键词： Estimation Correlation Antennas Delay Gain control MIMO Antenna measurements

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Estimation of the Radio Channel Parameters from a Circular Array with Directional Antennas

Estimation of the Radio Channel Parameters from a Circular A...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Annika Bottcher Peter Vary Christian Schneider Milan Narandzic Reiner S. Thoma Institute of Communication Systems and Data Processing RWTH Aachen University Germany Institute of Information Technology Ilmenau University of Technology Germany

Channel sounding, channel modeling and their parameter extraction in particular considering MIMO configurations, plays an important role for todays realistic wireless system design and evaluation. The analysis of the gathered channel sounding data has to match the specifics in the measurement system configuration. Within this contribution directional antenna arrays are used at both sides of the measured link. Furthermore, the measurement system applies automatic gain control between subsequent MIMO snapshots and additionally within the MIMO matrix. Both features lead to improved measurement accuracy. A new extension of existing power and delay domain analysis procedures considering the automatic gain control within the MIMO matrix is introduced and evaluated. The results show that delay spread and K-factor are more affected, while shadow fading and cross polarization ratios are almost not.

关键词： Estimation Antenna measurements MIMO Delay Gain control Correlation Base stations

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PARAMETER-BASED SPEECH QUALITY MEASURES FOR GSM

PARAMETER-BASED SPEECH QUALITY MEASURES FOR GSM

引用

IEEE第14届国际个人无线移动通信大会

作者： Marc Werner Karsten Kamps Ulrich Tuisel John G. Beerends Peter Vary Institute of Communication Systems and Data Processing () Aachen University Germany Institute of Communication Systems and Data Processing () Aachen University Germany E-Plus Mobilfunk GmbH Düsseldorf Germany TNO Telecom The Netherlands Institute of Communication Systems and Data Processing () Aachen University Germany

This contribution introduces instrumental speech quality measures for the GSM system based only on transmis- sion parameters. Certain combinations of GSM parameters which quantify the transmission

关键词： PARAMETER-BASED SPEECH QUALITY MEASURES FOR GSM

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Cross Correlation Characteristics of Large Scale Parameters in Urban Macro Cell

Cross Correlation Characteristics of Large Scale Parameters ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Annika Bottcher Peter Vary Christian Schneider Reiner S. Thoma Institute of Communication Systems and Data Processing RWTH Aachen University Germany Institute of Information Technology Ilmenau University of Technology Germany

Extensive analysis of channel measurement data for the investigation of new channel models plays a fundamental role in designing and evaluating todays wireless communication systems. Besides the knowledge of the parameters and their distribution functions, the cross correlation between them is of great interest and can be exploited for more sophisticated channel simulations. In this contribution the cross correlation characteristics of the large scale parameters (LSP) in the power and delay domain are investigated for different parameter estimation procedures (taking the spatial filtering due to directional antennas into account or neglecting it), for various distance ranges between base station (BS) and mobile station (MS) as well as for different antenna heights.

关键词： Correlation Antennas Antenna measurements Estimation MIMO Delay Gain control

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