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

作者： Luus, Francois P. S. Maharaj, Bodhaswar T. Univ Pretoria Dept Elect Elect & Comp Engn ZA-0002 Pretoria South Africa

ISBN: (纸本)9781457705397

The application of joint source-channel coding, based on fountain codes, in the broadcast timeslot of wireless two-way network coding is investigated in this paper. A computationally efficient subroutine is contributed to the implementation of the fountain compressor, and an error analysis is done. Motivated to develop a true joint source-channel-network code that compresses, adds robustness against channel noise and network codes two packets on a single bipartite graph and iteratively decodes the intended packet on the same Tanner graph, an adaptation of the fountain compressor is presented. The proposed code is shown to outperform a separated joint source-channel and network code in high source entropy and high channel noise regions.

关键词： joint source-channel coding joint source-channel-network coding two-way network coding fountain code lt-code

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The Capacity Region of the L-User Gaussian Inverse Compute-and-Forward Problem

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IEEE TRANSACTIONS ON INFORMATION THEORY 2016年第12期62卷 6953-6968页

作者： Chen, Yanying Song, Yiwei Devroye, Natasha Univ Illinois Chicago IL 60607 USA Univ Illinois Dept Elect & Comp Engn Chicago IL 60607 USA

We consider an L-user multiple access channel where transmitter m has access to the linear equation u(m) = circle plus(L)(l=1) f(ml) w(l), of independent messages w(l) is an element of F-p(kl) with f(ml) is an element of F-p, and the destination wishes to recover all L messages. This problem may be motivated as the last hop in a network where relay nodes employ the compute-and-forward strategy and decode linear equations of messages;we seek to do the reverse and extract messages from sums over a multiple access channel. In particular, we exploit the particular form of dependencies between the equations at the different relays to improve the reliable communication rates beyond those achievable by simply forwarding all equations to the destination independently. The presented achievable rate region for the discrete memoryless channel model is shown to be capacity for the additive white Gaussian noise channel.

关键词： Terms channel capacity multiple access channel compute-and-forward correlated sources joint source-channel coding multiuser channels

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source-Interference Recovery Over Broadcast channels: Asymptotic Bounds and Analog Codes

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IEEE TRANSACTIONS ON COMMUNICATIONS 2016年第8期64卷 3406-3418页

作者： Abou Saleh, Ahmad Alajaji, Fady Chan, Wai-Yip Queens Univ Dept Elect & Comp Engn Kingston ON K7L 3N6 Canada Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada

We consider the problem of joint recovery of a bivariate Gaussian source and of interference over the two-user Gaussian degraded broadcast channel in the presence of common interference. The interference, that is available non-causally at the encoder, is assumed to be Gaussian and correlated to the sources. The tradeoff between the distortion of the sources and the interference estimation error is studied;information-theoretic outer and inner bounds based on ideas from rate-distortion theory and hybrid coding are derived, respectively. More precisely, the outer bound is found by assuming additional knowledge at each user;the inner bound, however, is obtained by analyzing the distortion of a layered hybrid scheme based on proper power splitting, Costa and Wyner-Ziv coding. Low delay and complexity coding schemes based on analog mapping are next proposed. More specifically, parametric mappings based on linear and sawtooth curves are studied and optimized by minimizing an upper bound on the system's distortion;nonparametric mappings based on joint optimization between the encoder and the decoder using an iterative algorithm are designed. Numerical results show that for the special cases that are previously considered by Abou Saleh et al. (with no fading), the derived outer bound is tighter and the proposed hybrid scheme has a lower complex structure with no loss in performance. In addition, the proposed low delay nonlinear schemes outperform the linear scheme and perform relatively close to the inner bound under certain system settings.

关键词： joint source-channel coding distortion region correlated interference dirty paper coding Shannon-Kotel'nikov mapping low delay coding degraded broadcast channels

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A source-channel Separation Theorem With Application to the source Broadcast Problem

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IEEE TRANSACTIONS ON INFORMATION THEORY 2016年第4期62卷 1764-1781页

作者： Khezeli, Kia Chen, Jun McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada Cornell Univ Sch Elect & Comp Engn Ithaca NY 14853 USA

A converse method is developed for the source broadcast problem. Specifically, it is shown that the separation architecture is optimal for a variant of the source broadcast problem, and the associated source-channel separation theorem can be leveraged, via a reduction argument, to establish a necessary condition for the original problem, which unifies several existing results in the literature. Somewhat surprisingly, this method, albeit based on the source-channel separation theorem, can be used to prove the optimality of non-separation-based schemes and determine the performance limits in certain scenarios where the separation architecture is suboptimal.

关键词： Bandwidth mismatch broadcast channel capacity region joint source-channel coding separation theorem side information

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On Reconstructing Linear Combinations of Correlated Gaussian sources Over a MAC

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IEEE COMMUNICATIONS LETTERS 2016年第12期20卷 2450-2453页

作者： Ghasemi-Goojani, Shahab Behroozi, Hamid Sharif Univ Technol Dept Elect Engn Tehran 113659363 Iran

In this letter, we study the joint source-channel coding problem of communicating the linear functions of correlated Gaussian sources over a Gaussian multiple access channel. In this setup, each transmitter observes one of two correlated sources. The receiver aims to reconstruct a linear combination of both correlated Gaussian sources within an average distortion level. For this setup, we first obtain a new lower bound on the achievable distortion and then, we propose a novel lattice-based hybrid transmission scheme and its achievable distortion is derived. We show that our proposed scheme can achieve the optimal distortion under some conditions.

关键词： Lattice codes joint source-channel coding correlated Gaussian sources Gaussian multiple access channel mean-squared error distortion

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joint distributed source-channel coding for 3D videos

Joint distributed source-channel coding for 3D videos

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Conference on Image Processing: Algorithms and Systems IX

作者： Palma, Veronica Cancellaro, Michela Neri, Alessandro Univ Roma TRE Dept Appl Elect Rome Italy

ISBN: (纸本)9780819484079

This paper presents a distributed joint source-channel 3D video coding system. Our aim is the design of an efficient coding scheme for stereoscopic video communication over noisy channels that preserves the perceived visual quality while guaranteeing a low computational complexity. The drawback in using stereo sequences is the increased amount of data to be transmitted. Several methods are being used in the literature for encoding stereoscopic video. A significantly different approach respect to traditional video coding has been represented by Distributed Video coding (DVC), which introduces a flexible architecture with the design of low complex video encoders. In this paper we propose a novel method for joint source-channel coding in a distributed approach. We choose turbo code for our application and study the new setting of distributed joint source channel coding of a video. Turbo code allows to send the minimum amount of data while guaranteeing near channel capacity error correcting performance. In this contribution, the mathematical framework will be fully detailed and tradeoff among redundancy and perceived quality and quality of experience will be analyzed with the aid of numerical experiments.

关键词： distributed video coding turbo code joint source-channel coding

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An unequal error protection scheme for reliable peer-to-peer scalable video streaming

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JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2016年 38卷 790-801页

作者： Lo, Chi-Wen Zhou, Chao Lin, Chia-Wen Chen, Yung-Chang Ind Technol Res Inst Informat & Commun Res Labs Hsinchu Taiwan Peking Univ Inst Comp Sci & Technol Beijing 100871 Peoples R China Natl Tsing Hua Univ Dept Elect Engn Hsinchu 30013 Taiwan

This paper proposes an unequal error protection (UEP) scheme for transporting scalable video packets over packet-lossy peer-to-peer networks. In our scheme, given an estimated system uplink capacity, a receiver-driven joint source-channel coding (JSCC) mechanism is proposed by which each child-peer minimizes the received visual distortion by subscribing to appropriate numbers of source and channel coding packets. Because the bandwidth for inter-peer transmissions may fluctuate largely due to peer dynamics, in our method, a peer estimates 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 utilize 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 the visual quality, compared to other state-of-the-art schemes. (C) 2016 Elsevier Inc. All rights reserved.

关键词： Video streaming Peer-to-peer streaming Scalable video coding joint source-channel coding Unequal error protection

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Distortion Exponent in MIMO Fading channels With Time-Varying source Side Information

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IEEE TRANSACTIONS ON INFORMATION THEORY 2016年第6期62卷 3597-3617页

作者： Aguerri, Inaki Estella Gunduz, Deniz Imperial Coll London Dept Elect & Elect Engn London SW7 2BT England Huawei Technol Co Ltd France Res Ctr Math & Algorithm Sci Lab F-92100 Boulogne France Imperial Coll London Dept Elect & Elect Engn London SW7 2BT England

Transmission of a Gaussian source over a time-varying multiple-input multiple-output (MIMO) channel is studied under strict delay constraints. Availability of a correlated side information at the receiver is assumed, whose quality, i.e., its correlation with the source signal, also varies over time. A block-fading model is considered for the states of the time-varying channel and side information;perfect state information at the receiver is assumed, while the transmitter knows only the statistics. The high signal to noise ratio performance, characterized by the distortion exponent, is studied for this joint source-channel coding problem. An upper bound is derived and compared with several lower bounds based on list decoding (LD), hybrid digital-analog transmission, as well as multi-layer schemes, which transmit successive refinements of the source, relying on progressive or superposition transmission with LD. The optimal distortion exponent is characterized for the single-input multiple-output and multiple-input single-output scenarios by showing that the distortion exponent achieved by multi-layer superposition encoding with joint decoding meets the proposed upper bound. In the MIMO scenario, the optimal distortion exponent is characterized in the low bandwidth ratio regime, and it is shown that the multi-layer superposition encoding performs very close to the upper bound in the high bandwidth ratio regime.

关键词： Distortion exponent joint source-channel coding time-varying channel and side information list decoding broadcast codes successive refinement

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SOFTCAST WITH PER-CARRIER POWER-CONSTRAINED channelS 23

SOFTCAST WITH PER-CARRIER POWER-CONSTRAINED CHANNELS

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23rd IEEE International Conference on Image Processing (ICIP)

作者： Zheng, S. Antonini, M. Cagnazzo, M. Guerrieri, L. Kieffer, M. Nemoianu, I. Samy, R. Zhang, B. Univ Paris Sud CentraleSupelec CNRS L2S 3 Rue Joliot Curie F-91192 Gif Sur Yvette France Univ Nice Sophia Antipolis CNRS I3S 2000 Route Lucioles F-06903 Sophia Antipolis France Univ ParisSaclay Telecom ParisTech CNRS LTCI F-75013 Paris France STMicroelectron Sr1 Via Lavoratori Vittime Col Du Mont 28 I-11100 Aosta Italy SAGEMCOM R&T Direct 250 Route LEmpereur F-92838 Rueil Malmaison France STMicroelectron Srl Geneva Switzerland

ISBN: (纸本)9781467399616

This paper considers the Softcast joint source-channel video coding scheme for data transmission over parallel channels with different power constraints and noise characteristics, typical in DSL or PLT channels. To minimize the mean square error at receiver, an optimal precoding matrix design problem has to be solved, which requires the solution of an inverse eigenvalue problem. Such solution is taken from the MIMO channel precoder design literature. Alternative suboptimal precoding matrices are also proposed and analyzed, showing the efficiency of the optimal precoding matrix within Softcast, which provides gains increasing with the encoded video quality.

关键词： joint source-channel coding Softcast Precoding matrices PLT channels

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On the Impact of Lossy channels in Wireless Edge Caching

On the Impact of Lossy Channels in Wireless Edge Caching

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IEEE International Conference on Communications (ICC)

作者： Cacciapuoti, Angela Sara Caleffi, Marcello Ji, Mingyue Llorca, Jaime Tulino, Antonia Maria Univ Naples Federico II DIETI Dept Naples Italy Broadcom Ltd Sunnyvale CA USA Nokia Bell Labs New Providence NJ USA

ISBN: (纸本)9781479966646

One of the main challenges for continued wireless capacity growth is the difficulty in exploiting the multicast nature of the wireless medium: wireless end points rarely experience the same channel conditions or access the same content at the same time. In this paper, we present and analyze a novel wireless video delivery paradigm based on the combined use of channel-aware caching and coded multicasting that allows simultaneously serving multiple cache-enabled access points that may be requesting different content and experiencing different channel conditions. To this end, we reformulate the caching-aided coded multicast problem as a joint source-channel coding problem and design an achievable scheme that preserves the cache-enabled multiplicative throughput gains of the error-free scenario, by guaranteeing per-receiver (access point) rates unaffected by the presence of receivers with worse channel conditions.

关键词： Video delivery coded multicast caching wireless channel joint source-channel coding

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