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9th IEEE Workshop on Multimedia Signal Processing

作者： Stoufs, M. Munteanu, A. Cornelis, J. Schelkens, P. Vrije Univ Brussel Dept Elect & Informat ETRO Interdisciplinary Inst Broadband Technol IBBT B-1050 Brussels Belgium

ISBN: (纸本)9781424412730

In this paper, we propose a joint source-channel coding (JSCC) methodology which minimizes the end-to-end distortion for the transmission of H.264/MPEG-4 scalable video over packet loss channels. The proposed JSCC-approach employs low-density parity-check codes in order to provide channel protection and relies on Lagrangian-based optimization techniques to derive the appropriate protection levels for each layer produced by the scalable source codec. Experiments show that our JSCC methodology delivers competitive results to state-of-the-art Lagrangian-based algorithms. However, in contrast to the state-of-the-art, our approach significantly reduces the computational complexity. We conclude that the proposed JSCC methodology provides optimized resilience against transmission errors in scalable video streaming over variable-bandwidth error-prone channels.

关键词： scalable video coding joint source-channel coding unequal error protection

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ANALOG joint source-channel MULTIPLE DESCRIPTION coding SCHEME OVER AWGN PARALLEL channelS

ANALOG JOINT SOURCE-CHANNEL MULTIPLE DESCRIPTION CODING SCHE...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Aitor Erdozain Pedro M. Crespo Baltasar Beferull CEIT and TECNUN (Universidad de Navarra) 20009 Donostia-San Sebastian Spain Inst. Robotica y Tecnologias de la Informacion y las Comunicaciones Universidad de Valencia 46980 Paterna (Valencia) Spain

ISBN: (纸本)9781457705380

We propose a low complexity analog joint source channel coding Multiple Description (MD) scheme for transmitting the symbols of a Gaussian source across a pair of independent AWGN channels. The outputs of these channels have each a separated receiver, whereas a third receiver has both outputs available. At the transmitter side, a pair of bandwidth-reduction analog mappings are used for joint source-channel coding. The presented scheme has the inherent advantage over digital MD schemes based on separation, that coding and decoding can be performed by using a single-letter (or symbol), a strategy that is very suitable for applications where latency originated by the digital compression and the error correcting coding can not be tolerated. Our scheme achieves a performance that is competitive as compared to the optimal region while having a very low complexity and delay.

关键词： Multiple Description joint source-channel coding Combined source-channel coding joints Analog AWGN Pairing Scheme Data compression DEcoding Error correction codes Output

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BANDWIDTH-REDUCTION ANALOG MAPPINGS FOR AWGN channelS WITH SIDE INFORMATION

BANDWIDTH-REDUCTION ANALOG MAPPINGS FOR AWGN CHANNELS WITH S...

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European Signal Processing Conference

作者： Iker Alustiza Aitor Erdozain Pedro Crespo Baltasar Beferull-Lozano Tecnun and CEIT (Un. of Navarra) Inst. Robotica y Tecnologias de la Informacion

ISBN: (纸本)9781467310680

Recently, the joint source-channel coding schemes based on analog mappings have gained prominence. Their simplicity and low delay compared to other coding strategies make them more suitable for real-time applications. In this work, we propose a novel joint source-channel coding scheme, based also on analog mappings, for a point-to-point communication channel with side information at the receiver (also known as Wyner-Ziv scenario).

关键词： joint source-channel coding Wyner-Ziv scenario Analog mappings side information AWGN MAPPING(MATHEMATICAL) Analog Combined source-channel coding real-time application program point to point communication

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A Threshold-based Rate Optimization Algorithm for Image Transmission

A Threshold-based Rate Optimization Algorithm for Image Tran...

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2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Yanrong Yuan Chundi Xiu Hualiang Zhu Department of Electronics and Information Engineering Beijing University of Aeronautics and Astronautics 100191 Beijing China

An optimal bit rate allocation algorithm for image compressed with SPIHT is proposed. A threshold-based transmission scheme of SPIHT bit streams and a rate optimization algorithm based on threshold after analyzing the characteristics of SPIHT bit stream are developed in this paper. Simulation results show that, the proposed technical solution is better than the traditional bit stream allocation schemes in terms of the packet number used to decode and PSNR of reconstructed image. Therefore, the scheme is more potential and practical for future efficient and reliable wireless multimedia communication systems.

关键词： Image transmission joint source-channel coding set partitioning in hierarchical trees (SPIHT) rate optimization

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Wyner-Ziv coding Over Broadcast channels: Hybrid Digital/Analog Schemes

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IEEE TRANSACTIONS ON INFORMATION THEORY 2011年第9期57卷 5660-5672页

作者： Gao, Yang Tuncel, Ertem Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA

A new hybrid digital/analog scheme is proposed for lossy transmission of a Gaussian source over a bandwidth-matched Gaussian broadcast channel with source side information available at each receiver. The proposed scheme combines two schemes that were previously shown to achieve optimal point-to-point distortion/power tradeoff simultaneously at all receivers under two distinct conditions stated in terms of channel and side information quality parameters. For the two-receiver case, the combined scheme is shown to achieve the same kind of optimality for the entire region in the parameter space sandwiched between those two conditions. Crucial to this result is a new degree of freedom discovered in designing point-to-point hybrid digital/analog schemes with side information. When superimposed with analog transmission, the proposed scheme outperforms all previously known schemes even outside the optimality region in the parameter space.

关键词： Broadcast channels Costa coding hybrid digital/analog coding joint source-channel coding writing on dirty paper Wyner-Ziv coding

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Phase Asynchronous Cognitive Interference channels: Lossless source-channel Separation Theorems

Phase Asynchronous Cognitive Interference Channels: Lossless...

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IEEE Global Communications Conference

作者： Hamidreza Ebrahimzadeh Saffar Patrick Mitran Department of Electrical and Computer Engineering University of Waterloo

ISBN: (纸本)9781467309202

Sufficient and necessary conditions for reliable lossless communication of two correlated sources over classes of phase asynchronous cognitive interference channels are derived. Namely, we consider interference channels in which one of the encoders, i.e., the secondary or cognitive user, is causally or non-causally aware of the other's message. Moreover, as a practical constraint, we assume the transmitters are not aware of the phase shifts introduced by channels. We show that, for both classes of causal and noncausal cooperation, under strong interference conditions, separate source and channel coding is optimal for reliable communication of both users. Also, we derive necessary and sufficient conditions for reliable communication of the cognitive radio transmission while the primary is able to maintain the same information rate it could reliably send in the absence of the secondary. To the best of our knowledge, this is the first work to find fundamental limits of lossless reliable communication for cognitive interference channels.

关键词： joint source-channel coding Cognitive interference channel Phase uncertainty Correlated sources Unidirectional cooperation Interference channels Combined source-channel coding Lossless Phase shift radiowave propagation Information rates Asynchronous Communication Research ENCODER channel coding

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On the Performance of Hybrid Digital-Analog coding for Broadcasting Correlated Gaussian sources

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IEEE TRANSACTIONS ON COMMUNICATIONS 2011年第12期59卷 3335-3342页

作者： Behroozi, Hamid Alajaji, Fady Linder, Tamas Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada

We consider the problem of sending a bivariate Gaussian source S = (S-1, S-2) across a power-limited two-user Gaussian broadcast channel. User i (i = 1, 2) observes the transmitted signal corrupted by Gaussian noise with power sigma(2)(i) and desires to estimate S-i. We study hybrid digital-analog (HDA) joint source-channel coding schemes and analyze the region of ( squared-error) distortion pairs that are simultaneously achievable. Two cases are considered: 1) broadcasting with bandwidth compression, and 2) broadcasting with bandwidth expansion. We modify and adapt HDA schemes of Wilson et al. [1] and Prabhakaran et al. [2], originally proposed for broadcasting a single common Gaussian source, in order to provide achievable distortion regions for broadcasting correlated Gaussian sources. For comparison, we also extend the outer bound of Soundararajan et al. [3] from the matched source-channel bandwidth case to the bandwidth mismatch case.

关键词： Gaussian broadcast channel bandwidth compression/expansion joint source-channel coding hybrid digit-alanalog (HDA) coding Costa coding Wyner-Ziv coding layered coding uncoded transmission

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Optimal joint source-channel coding using unequal error protection for the scalable extension of H.264/MPEG-4 AVC

Optimal joint source-channel coding using unequal error prot...

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IEEE International Conference on Image Processing (ICIP 2007)

作者： Stoufs, M. Munteanu, A. Schelkens, P. Cornelis, J. Vrije Univ Brussel Dept Elect & Informat Interdisciplinary Inst Broadband Technol B-1050 Brussels Belgium

ISBN: (纸本)9781424414369

This paper proposes an optimized joint source-channel coding methodology with unequal error protection for the transmission of video encoded with the recently developed scalable extension of H.264/MPEG-4 AVC. The proposed methodology uses a simplified Viterbi-based search method which significantly outperforms the classical exhaustive search method in terms of computational complexity, leading to a practically applicable solution at the expense of a minimal loss of optimality. Experimental results show the effectiveness of our protection methodology and illustrate its capability to provide graceful degradation in the presence of channel mismatches.

关键词： scalable video coding error resilience joint source-channel coding unequal error protection

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Relaying via Hybrid coding

Relaying via Hybrid Coding

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IEEE International Symposium on Information Theory (ISIT)

作者： Kim, Young-Han Lim, Sung Hoon Minero, Paolo Univ Calif San Diego Dept ECE La Jolla CA 92093 USA Korea Adv Inst Sci & Technol Dept EE Daejeon South Korea Notre Dame Univ Dept EE Fremantle WA 6959 Australia

ISBN: (纸本)9781457705953

Motivated by the recently developed hybrid coding scheme for joint source-channel coding, this paper proposes a new coding scheme for noisy relay networks. The proposed coding scheme operates in a similar manner to the noisy network coding scheme, except that each relay node uses the hybrid coding interface to transmit a symbol-by-symbol function of the received sequence and its quantized version. This coding scheme unifies both amplify-forward and noisy network coding and can strictly outperform both. The potential of the hybrid coding interface for relaying is demonstrated through the diamond relay network and two-way relay channel examples.

关键词： channel coding Decoding Diamond-like carbon Network coding Noise measurement Relays amplify and forward communication amplify-forward network coding channel coding hybrid coding interface scheme joint source-channel coding network coding noisy relay network coding scheme relays source coding symbol-by-symbol function transmission two-way relay channel

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channel State Feedback Over the MIMO-MAC

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IEEE TRANSACTIONS ON INFORMATION THEORY 2011年第12期57卷 7787-7797页

作者： Kumar, K. Raj Caire, Giuseppe Ecole Polytech Fed Lausanne La Algorithm CH-1015 Lausanne Switzerland Univ So Calif Ming Hsieh Dept Elect Engn Los Angeles CA 90089 USA

In order to exploit the full multiplexing gain of multi-antenna multi-user downlink schemes, accurate channel state information at the transmitter (i.e., at the base station) is required. We consider the design of a closed-loop channel state information feedback scheme, where user terminals feed back their channel state information simultaneously to a multi-antenna base station. The underlying information theoretic problem consists of lossy source-channel coding of multiple independent analog sources (i.e., the users' channel coefficients) over a Gaussian multiple- input multiple-output multi-access channel (MIMO-MAC). Unlike the classical source-channel coding setting, this application requires low latency, otherwise the channel state information would be outdated. Hence, source-channel codewords can span only a single fading state of the uplink (feedback) channel. Furthermore, the transmitters are ignorant of the realization of the uplink channel coefficients. In this scenario, the scaling of the maximum of the estimated downlink channel mean-square errors with the SNR dominates the performance of the multiuser downlink. This scaling is described by the distortion SNR exponent, previously introduced in a single-user MIMO setting. This paper analyzes the max-min distortion SNR exponent of the MIMO-MAC for both separated source-channel coding, and a particular hybrid digital-analog joint source-channel coding scheme. For the case of single-antenna users, we prove that the distortion SNR exponent of separated source-channel coding can be achieved by the concatenation of scalar quantization and uncoded quadrature-amplitude modulation (QAM) transmission, with lattice decoding at the base-station receiver. The resulting scheme has very low encoding latency (only a few symbols of the uplink slot) and generally outperforms currently proposed channel state feedback schemes based on analog unquantized transmission or vector quantization with fixed codebooks.

关键词： channel state feedback joint source-channel coding multiple-antenna multiple-access channel (MIMO-MAC)

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