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Ad-Hoc and Sensor Networks Symposium

作者： Angela Sara Cacciapuoti Marcello Caleffi Mingyue Ji Jaime Llorca Antonia Maria Tulino DIETI Department University of Naples Federico II Broadcom Limited Bell Labs

ISBN: (纸本)9781479966653

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 Wire-less channel joint source-channel coding

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The price of re-establishing perfect, almost perfect or public monitoring in games with arbitrary monitoring 11

The price of re-establishing perfect, almost perfect or publ...

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Proceedings of the 5th International ICST Conference on Performance Evaluation Methodologies and Tools

作者： M. Le Treust S. Lasaulce Laboratoire des Signaux et Systèmes CNRS - Supélec - Univ Paris Sud Gif-sur-Yvette France

ISBN: (纸本)9781936968091

This paper establishes a connection between the notion of observation (or monitoring) structure in game theory and the one of communication channels in Shannon theory. One of the objectives is to know under which conditions an arbitrary monitoring structure can be transformed into a more pertinent monitoring structure. To this end, a mediator is added to the game. The objective of the mediator is to choose a signalling scheme that allows the players to have perfect, almost perfect or public monitoring and all of this, at a minimum cost in terms of signalling. Graph coloring, source coding, and channel coding are exploited to deal with these issues. A wireless power control game is used to illustrate these notions but the applicability of the provided results and, more importantly, the framework of transforming monitoring structures go much beyond this example.

关键词： graph coloring information theory monitoring structure repeated games joint source-channel coding

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A measure for the missed error detection probability for optimizing the forbidden symbol configuration in joint source-channel arithmetic codes

A measure for the missed error detection probability for opt...

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International Symposium on Circuits and Systems

作者： Hossein Kourkchi William E. Lynch M. Omair Ahmad Department of Electrical and Computer Engineering Concordia University 1455 de Maisonneuve Blvd. W. Montréal Québec Canada H3G 1M8

ISBN: (纸本)9781479953424

In joint source-channel arithmetic coding, a forbidden symbol (FS) is added to the symbol set to make it more robust against transmission errors. By splitting the interval occupied by the FS into subintervals, various configurations are possible. In this paper, the delay probability function (DPF), the probability of the number of bits required to detect an error, is calculated for various FS configurations. A figure of merit is also proposed for optimizing the FS configuration. It determines the probability of missed error detection (PMD). Simulations are carried out by employing a breadth-first suboptimal sequential MAP. The simulation results show the effectiveness of the proposed figure of merit, and support the FS configuration in which the FS interval lies entirely between the other information carrying symbols to be the best.

关键词： missed error detection Arithmetic coding maximum a posteriori (MAP) joint source-channel coding

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ENERGY EFFICIENT LOSSY TRANSMISSION OVER SENSOR NETWORKS WITH FEEDBACK

ENERGY EFFICIENT LOSSY TRANSMISSION OVER SENSOR NETWORKS WIT...

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Aman Jain Deniz Gunduz Sanjeev R. Kulkarni H. Vincent Poor Sergio Verdu Dept. of Electrical Engineering Princeton University Princeton NJ 08544

ISBN: (纸本)9781424442959

The energy-distortion function (E(D)) for a network is defined as the minimum total energy required to achieve a target distortion D at the receiver without putting any restrictions on the number of channel uses per source sample. E(D) is studied for a sensor network in which multiple sensors transmit their noisy observations of a Gaussian source to the destination over a Gaussian multiple access channel with perfect channel output feedback. While the optimality of separate source and channel coding is proved for the case of a single sensor, this optimality is shown to fail when there are multiple sensors in the network. A network with two sensors is studied in detail. First a lower bound on E(D) is given. Then, two achievability schemes are proposed: a separation based digital scheme and a Schalkwijk-Kailath (SK) type uncoded scheme. The gap between the lower bound and the upper bound based on separation is shown to be a constant even as the total energy requirement goes to infinity in the low distortion regime. On the other hand, as the distortion requirement is relaxed, the SK based scheme is shown to outperform separation in certain cases, proving that the optimality of source-channel separation does not hold in the multi-sensor setting.

关键词： Sensor networks energy efficiency feedback joint source-channel coding information theory

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MAP Decoding of Correlated sources over Soft-Decision Orthogonal Multiple Access Fading channels with Memory

MAP Decoding of Correlated Sources over Soft-Decision Orthog...

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IEEE Vehicular Technology Conference

作者： Seyed Parsa Beheshti Fady Alajaji Tamas Linder Department of Electrical and Computer Engineering Queens University Department of Mathematics and Statistics and the Department of Electrical and Computer Engineering Queens University

ISBN: (纸本)9781479944484

We consider the joint source-channel coding (JSCC) problem where the real valued outputs of two correlated memoryless Gaussian sources are scalar quantized, bit assigned, and transmitted, without applying any error correcting code, over a multiple access channel (MAC) which consists of two orthogonal point-to-point time-correlated Rayleigh fading sub-channels with soft-decision demodulation. At the receiver side, a joint sequence maximum a posteriori (MAP) detector is used to exploit the correlation between the two sources as well as the redundancy left in the quantizer's indices, the channel's soft-decision outputs, and noise memory. The MAC's sub-channels are modeled via non-binary Markov noise discrete channels recently shown to effectively represent point-to-point fading channels. For the simple case of quantizing the sources with two levels, we establish a necessary and sufficient condition under which the joint sequence MAP decoder can be reduced to a simple instantaneous symbol-by-symbol decoder. Then, using numerical results obtained by system simulation, it is observed that when the sources are highly correlated and soft-decision quantization is used, JSCC can profit from a high correlation in the channel noise process and provide significant signal-to-distortion ratio improvements of up to 6.3 dB over a fully interleaved channel.

关键词： joint source-channel coding Correlated Gaussian sources Multiple access channels MAP decoding channels with memory Time-correlated fading channels Scalar quantization

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

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

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IEEE International Conference on Image Processing

作者： Chi-Wen Lo Chia-Wen Lin Yung-Chang Chen Information and Communications Research Labs Industrial Technology Research Institute Taiwan Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9781479923427

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 Combined source-channel coding Forward error correction Subscriptions peer to peer file sharing up link Peers Videotapes HYBRID Bandwidth

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High-density analog image storage in an analog-valued non-volatile memory array

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NEUROMORPHIC COMPUTING AND ENGINEERING 2022年第4期2卷 044018-044018页

作者： Zheng, Xin Zarcone, Ryan, V Levy, Akash Khwa, Win-San Raina, Priyanka Olshausen, Bruno A. Wong, H. S. Philip Stanford Univ Dept Elect Engn Stanford CA 94305 USA Univ Calif Berkeley Redwood Ctr Theoret Neurosci Berkeley CA 94720 USA Taiwan Semicond Mfg Co Ltd Corp Res Hsinchu Taiwan Fountain Therapeut South San Francisco CA 94080 USA

Data stored in the cloud or on mobile devices reside in physical memory systems with finite sizes. Today, huge amounts of analog data, e.g. images and videos, are first digitalized and then compression algorithms (e.g. the JPEG standard) are employed to minimize the amount of physical storage required. Emerging non-volatile-memory technologies (e.g. phase change memory (PCM), resistive RAM (RRAM)) provide the possibility to store the analog information in a compressed format directly into analog memory systems. Here, we demonstrate with hardware experiments an image storage and compression scheme (joint source-channel coding) with analog-valued PCM and RRAM arrays. This scheme stores information in a distributed fashion and shows resilience to the PCM and RRAM device technology non-idealities, including defective cells, device variability, resistance drift, and relaxation.

关键词： analog memory image processing joint source-channel coding neural-network

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Robust image transmission strategies for fading channels

Robust image transmission strategies for fading channels

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3rd International Conference on Information and Communication Technologies, vol.2

作者： Herve BOEGLEN Olivier HAEBERLE Christian CHATELLIER Christian OLIVIER Laboratoire MIPS LABEL IUT de Mulhouse Mulhouse Cedex France Laboratoire SIC XLIM UMR CNRS 6172 Futuroscope Cedex France

The aim of this paper is to present a robust still-image transmission scheme and show its performance when used on a frequency flat fading channel By following a joint source-channel coding approach, it is shown that image transmission with good visual quality is possible even with BER as high as 4%. Furthermore, this scheme only requires 26% redundancy for Error Control coding (ECC). The ECC part can be completed by an original PDE-based restoration algorithm to further improve the visual quality of the image.

关键词： joint source-channel coding Image transmission Image compression Fading channels

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