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IEEE (first ITW conference of the year) information Theory Workshop (ITW)

作者： Victor Quintero Samir M. Perlaza Iñaki Esnaola Jean-Marie Gorce The CITI Laboratory a joint lab between the Institut National de Recherche en Informatique et en Automatique (INRIA) Institut National de Sciences Apliquées (INSA) de Lyon France Victor Quintero is also with Universidad del Cauca Popayán Colombia Dep. of Automatic Control and Systems Engineering The University of Sheffield United Kingdom

In this paper, an achievability region and a converse region for the two-user Gaussian interference channel with noisy channel-output feedback (G-IC-NOF) are presented. The achievability region is obtained using a random coding argument and three well-known techniques: rate splitting, superposition coding and backward decoding. The converse region is obtained using some of the existing perfect-output feedback outer-bounds as well as a set of new outer-bounds that are obtained by using genie-aided models of the original G-IC-NOF. Finally, it is shown that the achievability region and the converse region approximate the capacity region of the G-IC-NOF to within a constant gap in bits per channel use.

关键词： Transmitters Receivers Encoding Noise measurement Decoding Interference channels Random variables

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Strategies of SIMD Computing for Image Coding in GPU

Strategies of SIMD Computing for Image Coding in GPU

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International Conference on High Performance Computing

作者： Pablo Enfedaque Francesc Auli-Llinas Juan C. Moure Dep. of Information and Communications Engineering Universitat Autònoma de Barcelona Bellaterra Spain Dep. of Computer Architecture and Operating Systems Universitat Autònoma de Barcelona Bellaterra Spain

ISBN: (纸本)9781467384872

The main difficulty to implement modern image coding systems in a GPU is that the algorithms employed in the core of the coding scheme are inherently sequential. We recently proposed bitplane image coding with parallel coefficient processing (BPC-PaCo), a coding scheme that, contrarily to most systems, permits the processing of multiple coefficients of the image in parallel. This enables the use of SIMD computing, ideal for its implementation in a GPU. This paper introduces and evaluates the GPU implementation of BPC-PaCo employing two different strategies that tradeoff computational throughput and compression efficiency. The proposed implementation is compared to the best CPU and GPU implementations of JPEG2000, the state-of-the-art image compression standard. Experimental results indicate that BPC-PaCo achieves a computational throughput that is an order of magnitude superior to that achieved with such implementations with a small reduction in coding efficiency.

关键词： Image coding Encoding Graphics processing units Parallel processing Transform coding Context Instruction sets

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Resilient and efficient communication in many-core systems using network coding

Resilient and efficient communication in many-core systems u...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Sadia Moriam Yexin Yan Erik Fischer Elke Franz Gerhard P. Fettweis Dep. of Electrical Engineering and Information Technology Vodafone Chair Mobile Communication Systems Centre for Advancing Electronics Dresden (CFAED) Dep. of Computer Science Technische Universität Dresden Dresden Germany

Due to technology scaling, the number of processor cores on a chip constantly increases. Already today, we reach the domain of so called many-core systems-on-chip. However, this advance comes at the cost of reliability, which especially affects the communication performance of the underlying network-on-chip. Today's resiliency concepts for network-on-chip like automatic repeat request with retransmission are not feasible anymore and lead to long latencies and high network load. In this paper, we propose an on-chip transmission concept based on random linear network coding to provide high resiliency and an efficient communication in many-core processors at the same time. The concept offers a flexible and efficient computable coding scheme, which is well suited for on-chip communication and allows to exploit the path diversity of large networks. First, we use a flit-level cycle-accurate simulation model to investigate the performance potential of the proposed transmission scheme on a network-on-chip with 64 cores. Second, we propose an analytic model for random linear network coding in network-on-chip with retransmission, which is able to provide a very accurate performance estimation close to the cycle-accurate simulation. Finally, we apply the analytic model to investigate the performance potential on the large-scale, assuming a processor with 1024 cores.

关键词： Reliability Receivers Topology

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Robust Precoding Methods for Multiuser MISO Wireless Energy Harvesting systems

Robust Precoding Methods for Multiuser MISO Wireless Energy ...

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IEEE Vehicular Technology Conference

作者： Zhengyu Zhu Kyoung-Jae Lee Zhongyong Wang Zheng Chu Inkyu Lee School of Information Engineering Zhengzhou University Dep. of Electronics and Control Engineering Hanbat National University School of Electrical and Electronic Engineering Newcastle University School of Electrical Engineering Korea University

ISBN: (纸本)9781479980925

We address a new robust optimization problem in a multiuser multiple-input single-output broadcasting system with simultaneous wireless information and power transmission. Assuming that perfect channel-state information (CSI) for all channels is not available at the BS, the uncertainty of the CSI is modeled by an norm-bounded uncertainty set. To optimally design transmit beamforming weights and receive power splitting, an average total transmit power minimization problem is investigated subject to the individual harvested power constraint and the received signal-to-interference-plus-noise ratio constraint at each user. The original design problem is reformulated to a relaxed semidefinite program, and then two different approaches based on convex programming are proposed, which can be solved efficiently by the interior point algorithm. Interestingly, we show that the semidefinite relaxation (SDR) is tight. Numerical results are provided to validate the robustness of the proposed algorithms.

关键词： Robust Precoding Methods Multiuser MISO Wireless Energy Harvesting systems CSI multiple-input single-output convex programming power transmission wireless prediction coding energy harvesting Not Available Broadcasting system Robustness Interior point algorithm ideal channel

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Robust Beamforming and Power Splitting Design in Distributed Antenna System with SWIPT under Bounded Channel Uncertainty

Robust Beamforming and Power Splitting Design in Distributed...

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IEEE Conference on Vehicular Technology (VTC)

作者： Zhengyu Zhu Kyoung-Jae Lee Zhongyong Wang Inkyu Lee School of Information Engineering Zhengzhou University Zhengzhou China School of Electrical Engineering Korea University Seoul Korea Dep. of Electronics and Control Engineering Hanbat National University Daejeon Korea

ISBN: (纸本)9781479980895

In this paper, we investigate a multiuser downlink distributed antenna system with simultaneous wireless information and power transmission under the assumption of imperfect channel state information at the distributed antenna (DA) port. To optimally design robust transmit beamforming vectors and receive power splitting factors, our design objective is to maximize the average worst-case signal-to-interference-plus-noise ratio while simultaneously achieving the individual energy harvesting (EH) constraint for each user and the per-DA port power constraint. We solve this non- convex problem by reformulating it into a two-stage problem. Simulation results are shown to validate the robustness and effectiveness of the proposed algorithms.

关键词： Array signal processing Signal to noise ratio Robustness Interference Antenna arrays Wireless communication

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Cyber-physical operating systems — What are the right abstractions?

Cyber-physical operating systems — What are the right abstr...

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Mediterranean Conference on Embedded Computing (MECO)

作者： Peter Tröger Matthias Werner Jan Richling Operating Systems Group TU Chemnitz Chemnitz Germany Dep. of Electrical Engineering and Information Technology South Westphalia University of Applied Sciences Hagen Germany

While the future importance of cyber-physical systems is widely acknowledged, there is surprisingly rare discussion about the design of operating systems for these kinds of systems. We present an extended view on the low-level abstractions to be offered by the operating system to applications. The central idea is the treatment of all relevant cyber-physical entities as task execution resource, which directly impacts the representation of tasks, communication and memory in the application programming interface. The resulting concept framework can serve as starting point for future research in this field.

关键词： Operating systems Hardware Program processors Context Cyber-physical systems Programming

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Indirect solution for optimal control problems with a pure state constraint 19

Indirect solution for optimal control problems with a pure s...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Van Keulen, Thijs Eindhoven University of Technology Dep. of Mechanical Engineering Control Systems Technology Group Netherlands

ISBN: (纸本)9783902823625

This paper presents an algorithm that provides a regularization for the costate dynamics of state constrained optimal control problems with a scalar constraint under the assumption that the Hamiltonian is convex in the control and the state dynamics equation of the constrained state is monotonically increasing in the control variable. The algorithm is demonstrated with a classical optimal control problem. © IFAC.

关键词： Equations of state

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A generalization of the carries process 26

A generalization of the carries process

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26th International Conference on Formal Power Series and Algebraic Combinatorics, FPSAC 2014

作者： Fujita, Takahiko Nakano, Fumihiko Sadahiro, Taizo Faculty of Science and Engineering Dep. of Industrial and Systems Engineering Chuo University Tokyo Japan Dep. of Mathematics Gakushuin University Tokyo Japan Dep. of Information Science Tsuda Collge Tokyo Japan

We consider a carries process which is a generalization of that by Holte in the sense that (i) we take various digit sets, and (ii) we also consider negative base. Our results are: (i) eigenvalues and eigenvectors of the transition probability matrices, and their connection to combinatorics and representation theory, (ii) an application to the computation of the distribution of the sum of i.i.d. uniform r.v.'s on [0, 1], (iii) a relation to riffle shuffle. © 2014 Discrete Mathematics and Theoretical Computer Science (DMTCS), Nancy, France

关键词： Combinatorial mathematics

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The rainy season of cryptography 14

The rainy season of cryptography

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18th Panhellenic Conference on Informatics, PCI 2014

作者： Latsiou, Aikaterina Rizomili, Panagiotis Dep. of Information and Communication Systems Engineering University of Aegean Karlovassi Samos83200 Greece

ISBN: (纸本)1595930361

Cloud Computing (CC) is the new trend in computing and resource management, an architectural shift towards thin clients and conveniently centralized provision of computing and networking resources. Worldwide cloud services revenue reached 148.8 billion in 2014. However, CC introduces security risks that the clients of the cloud have to deal with. More precisely, there are many security concerns related to outsourcing storage and computation to the cloud and these are mainly attributed to the fact that the clients do not have direct control over the systems that process their data. In this paper, we investigate the new challenges that cryptography faces in the CC era. We introduce a security framework for analysing these challenges, and we describe the cryptographic techniques that have been proposed until now. Finally, we provide a list of open problems and we propose new directions for research. © 2014 ACM.

关键词： Outsourcing

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Indirect solution for optimal control problems with a pure state constraint

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IFAC Proceedings Volumes 2014年第3期47卷 2456-2461页

作者： Thijs van Keulen Eindhoven University of Technology Dep. of Mechanical Engineering Control Systems Technology group

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