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检索条件"主题词=Joint Source-channel coding"

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An end-to-end embedded approach for digital video multicast/broadcast over CDMA cellular networks

An end-to-end embedded approach for digital video multicast/...

引用

Conference on Visual Communications and Image Processing 2003

作者： Chan, YS Modestino, JW Rensselaer Polytech Inst Ctr Image Proc Res Troy NY 12180 USA

ISBN: (纸本)0819450235

We investigate multicast/broadcast of digital video over spread-spectrum CDMA cellular networks, a platform targeted at various kinds of multimedia services. In particular, we propose an end-to-end embedded transmission scheme which combines a scalable video source coder, adaptive power allocation, adaptive channel coding and an embedded multiresolution modulation strategy to simultaneously deliver a basic quality-of-service (QoS) to less capable receivers and an enhanced QoS for more capable receivers. We demonstrate the efficacy of this approach using the ITU-T H.263+ video source coder, although the approach is generally applicable to other scalable source coding schemes as well.

关键词： wireless video CDMA multicast/broadcast adaptive modulation and coding joint source coding-power control turbo codes embedded transmission cross-layer joint source-channel coding H.263+

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On Distortion Bounds for Dependent sources Over Wireless Networks

On Distortion Bounds for Dependent Sources Over Wireless Net...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Jalali, Shirin Effros, Michelle CALTECH Ctr Math Informat Pasadena CA 91125 USA CALTECH Dept Elect Engn Pasadena CA 91125 USA

ISBN: (纸本)9781457705953

Characterizing the set of achievable distortions in lossy transmission of dependent sources over multi-user channels is an open problem. Even for a channel such as the multiple access channel, where the capacity is well-understood, the complete characterization of achievable distortions is still unknown. Since separation of source coding and channel coding is sub-optimal for this case, bounds on achievable distortions require tools beyond prior channel capacities and rate-distortion bounds. In this paper we propose a systematic approach for finding lower bounds on the set of distortions achievable through joint source-channel coding.

关键词： channel coding Decoding joints Niobium source coding Systematics channel capacity channel capacity channel coding dependent source distortion joint source-channel coding lossy transmission multi-access systems multiple access channel multiuser channel multiuser channels radio networks rate distortion bound rate distortion theory source coding wireless networks

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A cheap relaying protocol for orthogonal relay channels

A cheap relaying protocol for orthogonal relay channels

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Djeumou, Brice Lasaulce, Samson Klein, Andrew G. SUPELEC LSS CNRS F-91190 Gif Sur Yvette France

ISBN: (纸本)9781424414833

The proposed relaying scheme, which is an optimized scalar quantize-and-forward (QF) protocol, has at least three attractive features: 1. it is simple;2. it exploits the signal-to-noise ratios (SNR) of the source-relay and relay-destination channels;3. it can be seen as a digital alternative of the conventional (analog) amplify-and-forward (AF) in a digital relay transceiver. The presented QF protocol is optimized in terms of end-to-end distortion, extending the idea of joint source-channel coding. Using this cooperation protocol over orthogonal relay channels, it is shown that the quantization noise introduced by the relay can significantly degrade the receiver performance if the latter uses a maximum ratio combiner (MRC) to combine the two signals from the source and relay. In order for the receiver to compensate for this effect, we propose a maximum likelihood detector (MLD), which is optimum for the QF protocol.

关键词： relay channel quantize-and-forward joint source-channel coding ML detector amplify-and-forward

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High Perceptual Quality Wireless Image Delivery with Denoising Diffusion Models

High Perceptual Quality Wireless Image Delivery with Denoisi...

引用

IEEE Conference on Computer Communications (IEEE INFOCOM)

作者： Yilmaz, Selim F. Niu, Xueyan Bai, Bo Han, Wei Deng, Lei Gunduz, Deniz Imperial Coll London London England Huawei Technol Co Ltd Shenzhen Peoples R China

ISBN: (纸本)9798350384482;9798350384475

We consider the image transmission problem over a noisy wireless channel via deep learning-based joint source-channel coding (DeepJSCC) along with a denoising diffusion probabilistic model (DDPM) at the receiver. Specifically, we are interested in the perception-distortion trade-off in the practical finite block length regime, in which separate source and channel coding can be highly suboptimal. We introduce a novel scheme, where the conventional DeepJSCC encoder targets transmitting a lower resolution version of the image, which later can be refined thanks to the generative model available at the receiver. In particular, we utilize the range-null space decomposition of the target image;DeepJSCC transmits the range-space of the image, while DDPM progressively refines its null space contents. Through extensive experiments, we demonstrate significant improvements in distortion and perceptual quality of reconstructed images compared to standard DeepJSCC and the state-of-the-art generative learning-based method.

关键词： joint source-channel coding denoising diffusion models generative learning wireless image delivery

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Fine grained loss protection for robust Internet video streaming

Fine grained loss protection for robust Internet video strea...

引用

Conference on Visual Communications and Image Processing 2001

作者： van der Schaar, M Radha, H Philips Labs USA Briarcliff Manor NY 10510 USA

ISBN: (纸本)0819439886

Several embedded video coding schemes have been recently developed for multimedia streaming over IP. In particular, Fine-Granular -Scalability, (FGS) video coding has been recently adopted by the MPEG-4 standard as the core video-compression method for streaming applications. From its inception, the FGS scalability, structure was designed to be packet-loss resilient especially under Unequal Packet-loss Protection (UPP). In this paper we introduce the notion of Fine Grained Loss Protection (FGLP), which provides UPP within the FGS enhancement-layer, and we develop an analytical framework for evaluating FGLP bounds. Based on these bounds, we show the impact of applying fine-grained protection to the FGS enhancement-layer for different types of video sequences and over a wide range of bit-rates and packet-loss ratios. Subsequently the FGLP framework has been implemented using forward error correction codes and its performance for Internet video streaming has been evaluated. As illustrated by our extensive simulation results, fine-grained loss protection for the FGS enhancement-layer can provide significant resilience under moderate-to-high packet-loss ratios (e.g. 5-10%).

关键词： Internet video streaming joint source-channel coding unequal error protection Fine Granular Scalability

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Optimized Signaling of Binary Correlated sources over Gaussian Multiple Access channels 88

Optimized Signaling of Binary Correlated Sources over Gaussi...

引用

88th IEEE Vehicular Technology Conference (VTC-Fall)

作者： Weng, Jian-Jia Alajaji, Fady Linder, Tamas Queens Univ Dept Math & Stat Kingston ON Canada

ISBN: (纸本)9781538663585

This work focuses on the construction of optimized binary signaling schemes for two-sender uncoded transmission of correlated non-uniform sources over non-orthogonal Gaussian multiple access channels. Based on an error-rate analysis under joint maximum-a-posteriori decoding, optimized binary-pulsed amplitude modulation constellations for two senders are derived to minimize the system's error rate. The joint probability distribution of the two-senders' source is observed to induce a special layout of optimized constellations which can effectively control the interference due to non-orthogonal transmission. Numerical results further confirm that significant gains are achievable by the proposed design.

关键词： joint source-channel coding binary signaling MAP detection Gaussian multiple access channels interference correlated non-uniform sources error analysis

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joint source-channel decoding ASIP architecture for sensor networks

Joint source-channel decoding ASIP architecture for sensor n...

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4th International Conference on Embedded Software and Systems

作者： Ituero, Pablo Landaburu, Gorka Del Ser, Javier Lopez-Vallejo, Marisa Crespo, Pedro M. Atxa, Vicente Altuna, Jon Univ Politecn Madrid ETSIT Madrid Spain Mondragon Unibertsitatea Arrasate Mondragon Spain Univ Navarra CEIT TECNUN Navarra Spain

ISBN: (纸本)9783540726845

In a sensor network, exploiting the correlation among different sources allows a significant reduction of the transmitted energy at the cost of a complex decoder scheme. This paper introduces the first hardware implementation for joint source-channel decoding of correlated sources. Specifically, a dual-clustered VLIW processor with a highly optimized datapath is presented.

关键词： ASIP DSC factor graphs joint source-channel coding sensor networks turbo codes VLIW

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Distributed Transmission of Functions of Correlated sources over a Fading Multiple Access channel

Distributed Transmission of Functions of Correlated Sources ...

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47th Annual Allerton Conference on Communication, Control, and Computing

作者： Rajesh, R. Sharma, Vinod Indian Inst Sci Dept ECE Bangalore 560012 Karnataka India

ISBN: (纸本)9781424458707

In this paper we address the problem of distributed transmission of functions of correlated sources over a fast fading multiple access channel (MAC). This is a basic building block in a hierarchical sensor network used in estimating a random field where the cluster head is interested only in estimating a function of the observations. The observations are transmitted to the cluster head through a fast fading MAC. We provide sufficient conditions for lossy transmission when the encoders and decoders are provided with partial information about the channel state. Furthermore signal side information maybe available at the encoders and the decoder. Various previous studies are shown as special cases. Efficient joint-source channel coding schemes are discussed for transmission of discrete and continuous alphabet sources to recover function values.

关键词： joint source-channel coding Fading MAC Power allocation Partial channel state information Graph coloring Correlated sources

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Optimal unequal channel protection of multiple-description product codes for multimedia communications over fast fading channels

Optimal unequal channel protection of multiple-description p...

引用

IEEE Wireless Communications and Networking Conference

作者： Sarshar, N Wu, XL McMaster Univ Hamilton ON Canada

ISBN: (纸本)0780383443

In recent literature a powerful multiple description product coding scheme for protection of progressively encoded source streams has been devised that. disperses information evenly between all description packets, Also, techniques were proposed to protect these packets equally by an optimal channel coder (found by exhaustive search). The contribution of this paper is to show that. equal protection of all descriptions is suboptimal when the channel varies with time despite the fact that all descriptions have equal importance. We propose a theoretical framework for computing the globally optimal channel protection assignment for a given set of available channel coders under some idealized assumptions. For more practical scenarios we propose an optimized uneven packet protection scheme that outperforms equal protection schemes in terms of the expected distortion of received sources. Simulations of an image transmission system that resembles a 3G high bitrate link is provided where our unequal protection scheme. improves the average PSNR. of the received images by more than 1.3dB.

关键词： product codes scalable source codes wireless communications fading channels unequal channel protection joint source-channel coding multimedia streaming

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Time-Asynchronous Gaussian Multiple Access channel with Correlated sources

Time-Asynchronous Gaussian Multiple Access Channel with Corr...

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IEEE International Symposium on Information Theory (ISIT)

作者： Saffar, H. Ebrahimzadeh Mitran, P. Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781479904464

We study the transmission of a pair of correlated sources over a Gaussian multiple access channel with weak time asynchronism between the encoders. In particular, we assume that the maximum possible offset d(max)(n) between the transmitters grows without bound as the block length n -> infinity while the ratio d(max)(n)/n of the maximum possible offset t. o t8 he block length asymptotically vanishes. For such a joint source-channel coding problem, we derive the capacity region and also show that separate source and channel coding achieves optimal performance. Specifically, we first derive an outer bound on the source entropy content as our main result. Then, using Slepian-Wolf source coding combined with the channel coding introduced in [1], we show that the thus achieved inner bound matches the outer bound.

关键词： Multiple-access channel time asynchronism joint source-channel coding correlated sources

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