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检索条件"主题词=joint source-channel coding"

共 619 条记录，以下是551-560 订阅

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

Distributed Transmission of Functions of Correlated Sources ...

引用

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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joint source-channel decoding ASIP architecture for sensor networks

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

引用

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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Time-Asynchronous Gaussian Multiple Access channel with Correlated sources

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

引用

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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A HYBRID SENDER/RECEIVER-DRIVEN ERROR PROTECTION SCHEME FOR RELIABLE P2P SCALABLE VIDEO STREAMING

A HYBRID SENDER/RECEIVER-DRIVEN ERROR PROTECTION SCHEME FOR ...

引用

20th IEEE International Conference on Image Processing (ICIP)

作者： Lo, Chi-Wen Lin, Chia-Wen Chen, Yung-Chang Ind Technol Res Inst Informat & Commun Res Labs Taichung Taiwan Natl Tsing Hua Univ Dept Elect Engn Hsinchu Taiwan

ISBN: (纸本)9781479923410

This paper proposes a hybrid sender/receiver-driven error protection scheme to transmit scalable video packets over packet-lossy peer-to-peer networks. In our scheme, given an estimated system uplink capacity, a joint source-channel coding (JSCC) mechanism based on receiver-driven subscriptions is proposed to minimize the visual distortion received by child-peers by subscribing to appropriate amounts of source and channel coding packets. Because the bandwidth for inter-peer transmissions may fluctuate largely due to peer dynamics, in our method peers estimate the available system uplink capacity based on consensus propagation to avoid the fluctuating allocations of JSCC. To efficiently utilize the uplink bandwidth of peers, parent-peers use sender-driven contribution-guided peer selection to reject the low-contribution subscriptions requested from candidate child-peers. Simulation results demonstrate that our method significantly improves visual quality, compared to other state-of-the-art schemes.

关键词： peer-to-peer video streaming scalable video coding (SVC) forward error correction joint source-channel coding

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Enhancement of video quality for energy constrained cellular applications

Enhancement of video quality for energy constrained cellular...

引用

IEEE International Conference on Image Processing (ICIP 2006)

作者： Farshchian, Masoud Pearlman, William A. Sakalli, Mustafa Rensselaer Polytech Inst 110 Eighth St Troy NY 12180 USA

ISBN: (纸本)9781424404810

In this paper we consider the problem of faded wireless image and video transmission schemes under energy transmission constraints. An example of such a constrained system experiencing Rayleigh fading is Code Division Multiple Access (CDMA) where power control is used. We imposed on the average energy transmitted per an image or image sequence. A computationally inexpensive analytic mean square error (MSE) distortion rate (D-R) estimator for progressive wavelet coders which generates an exact distortion rate (D-R) function for 2-D and 3-D SPIHT algorithm is utilized from our previous research. Using the D-R function, the expected mean square error(MSE) at the receiver is minimized by optimally assigning the energy and parity allocation per each transmission block among the packets. A gain of 1.09 dB relative to optimal equal error protection (EEP) is obtained by varying both energy and parity among the transmission blocks. The results can be used to to increase image and video quality in CDMA systems.

关键词： 2-D and 3-D SPIHT joint source-channel coding energy constrained transmission

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COMMIN: SEMANTIC IMAGE COMMUNICATIONS AS AN INVERSE PROBLEM WITH INN-GUIDED DIFFUSION MODELS 49

COMMIN: SEMANTIC IMAGE COMMUNICATIONS AS AN INVERSE PROBLEM ...

引用

49th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Chen, Jiakang You, Di Gunduz, Deniz Dragotti, Pier Luigi Imperial Coll London Dept Elect & Elect Engn London England

ISBN: (纸本)9798350344868;9798350344851

joint source-channel coding schemes based on deep neural networks (DeepJSCC) have recently achieved remarkable performance for wireless image transmission. However, these methods usually focus only on the distortion of the reconstructed signal at the receiver side with respect to the source at the transmitter side, rather than the perceptual quality of the reconstruction which carries more semantic information. As a result, severe perceptual distortion can be introduced under extreme conditions such as low bandwidth and low signal-to-noise ratio. In this work, we propose CommIN, which views the recovery of high-quality source images from degraded reconstructions as an inverse problem. To address this, CommIN combines Invertible Neural Networks (INN) with diffusion models, aiming for superior perceptual quality. Through experiments, we show that our CommIN significantly improves the perceptual quality compared to DeepJSCC under extreme conditions and outperforms other inverse problem approaches used in DeepJSCC.

关键词： Semantic communications joint source-channel coding inverse problems invertible neural networks diffusion models

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DEEP LOW-LATENCY joint SPEECH TRANSMISSION AND ENHANCEMENT OVER A GAUSSIAN channel 49

DEEP LOW-LATENCY JOINT SPEECH TRANSMISSION AND ENHANCEMENT O...

引用

49th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Bokaeil, Mohammad Jensen, Jesper Doclo, Simon Ostergaard, Jan Aalborg Univ Aalborg Denmark Oticon AS Copenhagen Denmark Carl von Ossietzky Univ Oldenburg Dept Med Phys & Acoust Oldenburg Germany

ISBN: (纸本)9798350374520;9798350374513

Ensuring intelligible speech communication for hearing assistive devices in low-latency scenarios presents significant challenges in terms of speech enhancement, coding and transmission. In this paper, we propose novel solutions for low-latency joint speech transmission and enhancement, leveraging deep neural networks (DNNs). Our approach integrates two state-of-the-art DNN architectures for low-latency speech enhancement and low-latency analog joint source-channel-based transmission, creating a combined low-latency system and jointly training both systems in an end-to-end approach. Due to the computational demands of the enhancement system, this order is suitable when high computational power is unavailable in the decoder, like hearing assistive devices. The proposed system enables the configuration of total latency, achieving high performance even at latencies as low as 3 ms, which is typically challenging to attain. The simulation results provide compelling evidence that a joint enhancement and transmission system is superior to a simple concatenation system in diverse settings, encompassing various wireless channel conditions, latencies, and background noise scenarios.

关键词： low-latency joint source-channel coding analogue speech transmission speech enhancement

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Empirical Coordination with Two-Sided State Information and Correlated source and State

Empirical Coordination with Two-Sided State Information and ...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Le Treust, Mael Univ Cergy Pontoise CNRS ENSEA ETISUMR 8051 6 Ave Ponceau F-95014 Cergy Pontoise France

ISBN: (纸本)9781467377041

The coordination of autonomous agents is a critical issue for decentralized communication networks. Instead of transmitting information, the agents interact in a coordinated manner in order to optimize a general objective function. A target joint probability distribution is achievable if there exists a code such that the sequences of symbols are jointly typical. The empirical coordination is strongly related to the joint source-channel coding with two-sided state information and correlated source and state. This problem is also connected to state communication and is open for non-causal encoder and decoder. We characterize the optimal solutions for perfect channel, for lossless decoding, for independent source and channel, for causal encoding and for causal decoding.

关键词： Shannon Theory State-dependent channel joint source-channel coding Empirical Coordination Empirical Distribution of Symbols Non-Causal Encoding and Decoding Causal Encoding Causal Decoding

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