检索结果-内蒙古大学图书馆

Cooperation in 5G Heterogeneous Networking: Relay Scheme Combination and Resource Allocation

学校读者我要写书评

暂无评论

Cooperation in 5G Heterogeneous Networking: Relay Scheme Com...

作者： Chen, Zhengchuan Li, Tao Fan, Pingyi Quek, Tony Q. S. Letaief, Khaled Ben Information Systems Technology and Design Pillar Singapore University of Technology and Design Singapore487372 Singapore Department of Electronic Engineering Tsinghua University Beijing100084 China Department of Electrical and Computer Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong Hamad Bin Khalifa University Doha5825 Qatar

In 5G heterogeneous networking, it is promising to integrate different wireless networks to provide higher data rate. This paper models the integrated system as a receiver frequency division relay channel (RFDRC) and studies how to improve the transmission rate by combining decode-forward (DF), compress-forward (CF), and amplify-forward (AF) schemes. First, we establish clear criterions on how to select a relay scheme among DF, CF, and AF schemes and prove that the CF outperforms AF for all possible configurations. Based on the scheme selection criterions, we propose a hybrid DF-CF scheme which takes advantage of both DF and CF schemes in RFDRC. A near-optimal resource allocation is presented for the DF-CF-based system, leading to a new achievable rate for RFDRC. For ease of implementation, we further put forward a hybrid DF-AF scheme and reconsider the joint bandwidth and power allocation. Two suboptimal resource allocation solutions are established. In particular, when source frequency band and relay frequency band have equivalent bandwidth, we show that the proposed hybrid DF-AF scheme can achieve the concave envelope of the maximum between DF rate and AF rate. Numerical results show that the proposed schemes bring significant gains for RFDRC. © 2016 IEEE.

关键词： Resource allocation

Harnessing Self-Interference in Full-Duplex Relaying: An Analog Filter-and-Forward Approach

学校读者我要写书评

暂无评论

Harnessing Self-Interference in Full-Duplex Relaying: An Ana...

IEEE Global Communications Conference

作者： Jie Xu Lingjie Duan Rui Zhang School of Information Engineering Guangdong University of Technology Engineering Systems and Design Pillar Singapore University of Technology and Design Department of Electrical and Computer Engineering National University of Singapore

ISBN: (纸本)9781509013296

This paper studies a full-duplex filter-and-forward (FD-FF) relay system in frequency-selective channels. Conventionally, the loop-back signal at the FD relay is treated as harmful self-interference and needs to be significantly suppressed via both analog- and digital-domain cancellation. However, the performance of the conventional self-interference cancellation approach is fundamentally limited due to the quantization error induced by the analog-to-digital converter (ADC) with limited dynamic range. In this paper, we consider an analog filter-and-forward design to help avoid the quantization error, and surprisingly show that the maximum achievable rate of such an FD-FF relay system is in fact regardless of the loop-back channel at the FD relay. We characterize the maximum achievable rate of this channel by jointly optimizing the transmit power allocation over frequency at the source and the frequency response of the filter at the relay, subject to their individual power constraints. Although this problem is non-convex, we obtain its optimal solution by applying the Lagrange duality method. By simulations it is shown that the proposed joint source and relay optimization achieves rate gains over other heuristic designs, and is also advantageous over the conventional approach by cancelling the relay loop-back signal as self-interference, especially when the residual self-interference after cancellation is still significant.

关键词： Relays OFDM Quantization (signal) Frequency response Delays Resource management Lagrangian functions Lagrangian frequency response relay Quantization self-interference management of resources Orthogonal frequency division multiplexing analogue filter CANCELLATIONS FULL DUPLEX delay

Deadline Scheduling as Restless Bandits

学校读者我要写书评

暂无评论

Deadline Scheduling as Restless Bandits

Annual Allerton Conference on Communication, Control, and Computing

作者： Zhe Yu Yunjian Xu Lang Tongt the School of Electrical and Computer Engineering Cornell University Ithaca NY 14853 USA the School of Engineering Systems and Design Pillar Singapore University of Technology and Design Singapore 487372

ISBN: (纸本)9781509045518

The problem of stochastic deadline scheduling is considered. A constrained Markov decision process model is introduced in which jobs arrive randomly at a service center with stochastic job sizes, rewards, and completion deadlines. The service provider faces random processing costs, convex non-completion penalties, and a capacity constraint that limits the simultaneous processing of jobs. Formulated as a restless multi-armed bandit problem, the stochastic deadline scheduling problem is shown to be indexable. A closed-form expression of the Whittle's index is obtained for the case when the processing costs are constant. An upper bound on the gap-to-optimality of the Whittle's index policy is established, and the bound is shown to converge to zero as the job arrival rate and the the number of simultaneously available processors increase simultaneously.

关键词： problem stochastic deadline

Ten simple rules for reproducible research in jupyter notebooks

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Rule, Adam Birmingham, Amanda Zuniga, Cristal Altintas, Ilkay Huang, Shih-Cheng Knight, Rob Moshiri, Niema Nguyen, Mai H. Rosenthal, Sara Brin Pérez, Fernando Rose, Peter W. Design Lab UC San Diego San DiegoCA United States Center for Computational Biology and Bioinformatics UC San Diego San DiegoCA United States Department of Pediatrics UC San Diego San DiegoCA United States Data Science Hub San Diego Supercomputer Center UC San Diego San DiegoCA United States Departments of Bioengineering and Computer Science and Engineering Center for Microbiome Innovation UC San Diego San DiegoCA United States Bioinformatics and Systems Biology Graduate Program UC San Diego San DiegoCA United States Department of Statistics Berkeley Institute for Data Science UC Berkeley Lawrence Berkeley National Laboratory BerkeleyCA United States Biomedical Informatics Graduate Program Stanford University StanfordCA United States

Reproducibility of computational studies is a hallmark of scientific methodology. It enables researchers to build with confidence on the methods and findings of others, reuse and extend computational pipelines, and thereby drive scientific progress. Since many experimental studies rely on computational analyses, biologists need guidance on how to set up and document reproducible data analyses or simulations. In this paper, we address several questions about reproducibility. For example, what are the technical and non-technical barriers to reproducible computational studies? What opportunities and challenges do computational notebooks offer to overcome some of these barriers? What tools are available and how can they be used effectively? We have developed a set of rules to serve as a guide to scientists with a specific focus on computational notebook systems, such as Jupyter Notebooks, which have become a tool of choice for many applications. Notebooks combine detailed workflows with narrative text and visualization of results. Combined with software repositories and open source licensing, notebooks are powerful tools for transparent, collaborative, reproducible, and reusable data analyses. Copyright © 2018, The Authors. All rights reserved.

关键词： Digital storage

Sparse representation based multi-sensor image fusion: A review

学校读者我要写书评

暂无评论

arXiv 2017年

作者： Zhang, Qiang Liu, Yi Blum, Rick S. Han, Jungong Tao, Dacheng Key Laboratory of Electronic Equipment Structure Design Ministry of Education Xidian University China Center for Complex Systems School of Mechano-Electronic Engineering Xidian University Xi'an Shaanxi710071 China Electrical and Computer Engineering Depart-ment Lehigh University BethlehemPA18015 United States Department of Computer and Information Sciences Northumbria University Newcastle upon TyneNE1 8ST United Kingdom School of Information Technologies in Faculty of Engineering and Information Technologies University of Sydney J12/318 Cleveland St DarlingtonNSW2008 Australia

As a result of several successful applications in computer vision and image processing, sparse representation (SR) has attracted significant attention in multi-sensor image fusion. Unlike the traditional multiscale transforms (MSTs) that presume the basis functions, SR learns an over-complete dictionary from a set of training images for image fusion, and it achieves more stable and meaningful representations of the source images. By doing so, the SR-based fusion methods generally outperform the traditional MST-based image fusion methods in both subjective and objective tests. In addition, they are less susceptible to mis-registration among the source images, thus facilitating the practical applications. This survey paper proposes a systematic review of the SR-based multi-sensor image fusion literature, highlighting the pros and cons of each category of approaches. Specifically, we start by performing a theoretical investigation of the entire system from three key algorithmic aspects, (1) sparse representation models;(2) dictionary learning methods;and (3) activity levels and fusion rules. Subsequently, we show how the existing works address these scientific problems and design the appropriate fusion rules for each application such as multi-focus image fusion and multi-modality (e.g., infrared and visible) image fusion. At last, we carry out some experiments to evaluate the impact of these three algorithmic components on the fusion performance when dealing with different applications. This article is expected to serve as a tutorial and source of reference for researchers preparing to enter the field or who desire to employ the sparse representation theory in other fields. Copyright © 2017, The Authors. All rights reserved.

关键词： Image fusion

AtLAST Science Overview Report

学校读者我要写书评

暂无评论

arXiv 2024年

作者： Booth, Mark Klaassen, Pamela Cicone, Claudia Mroczkowski, Tony Cordiner, Martin A. Di Mascolo, Luca Johnstone, Doug van Kampen, Eelco Lee, Minju M. Liu, Daizhong Orlowski-Scherer, John Saintonge, Amélie Smith, Matthew W.L. Thelen, Alexander Wedemeyer, Sven Akiyama, Kazunori Andreon, Stefano Arzoumanian, Doris Bakx, Tom J.L.C. Bot, Caroline Bower, Geoffrey Brajša, Roman Chen, Chian-Chou da Cunha, Elisabete Eden, David Ettori, Stefano Gaches, Brandt Hatziminaoglou, Evanthia Luppe, Patricia Magnelli, Benjamin Marshall, Jonathan P. Montenegro-Montes, Francisco Miguel Niemack, Michael Nixon, Conor de Pater, Imke Perrott, Yvette Raimundo, Sandra I. Redaelli, Elena Richards, Anita Rybak, Matus Šarčević, Nikolina Semenov, Dmitry Spezzano, Silvia Srinivasan, Sundar Stanke, Thomas Andreani, Paola Beltrán, Maria T. Butler, Bryan J. Cantalupo, Sebastiano Dagostino, Miguel Chavez Duarte-Cabral, Ana Emonts, Bjorn Fletcher, Leigh Gary, Dale E. Gunar, Stanislav Hacar, Alvaro Hagedorn, Bendix Kaminski, Tomek Kirton, Fiona de Kleer, Katherine Kontar, Eduard Kuan, Yi-Jehng Lightfoot, John Lopez-Rodriguez, Enrique Lundgren, Andreas Milam, Stefanie N. Mohan, Atul Moreno, Raphael Motorina, Galina G. Moullet, Arielle Pattle, Kate Pellizzoni, Alberto Peretto, Nicolas Ramasawmy, Joanna Ricci, Claudio Rigby, Andrew J. Sánchez-Monge, Álvaro Saberi, Maryam Shimojo, Masumi Simionescu, Aurora Thompson, Mark Traficante, Alessio Vignali, Cristian White, Stephen M. UK Astronomy Technology Centre Royal Observatory Edinburgh Blackford Hill EdinburghEH9 3HJ United Kingdom Institute of Theoretical Astrophysics University of Oslo PO Box 1029 Blindern Oslo0315 Norway Karl-Schwarzschild-Strasse 2 Garching85748 Germany Astrochemistry Laboratory NASA Goddard Space Flight Center Code 691 GreenbeltMD20771 United States Laboratoire Lagrange Université Côte d’Azur Observatoire de la Côte d’Azur CNRS Blvd de l’Observatoire CS 34229 Nice06304 cedex 4 France Astronomy Unit Department of Physics University of Trieste via Tiepolo 11 Trieste34131 Italy INAF – Osservatorio Astronomico di Trieste via Tiepolo 11 Trieste34131 Italy IFPU – Institute for Fundamental Physics of the Universe Via Beirut 2 Trieste34014 Italy NRC Herzberg Astronomy and Astrophysics 5071 West Saanich Rd VictoriaBCV9E 2E7 Canada Department of Physics and Astronomy University of Victoria VictoriaBCV8P 5C2 Canada Denmark DTU-Space Technical University of Denmark Elektrovej 327 Kgs. LyngbyDK2800 Denmark Max-Planck-Institut für extraterrestrische Physik Giessenbachstrasse 1 Garching BayernD-85748 Germany Purple Mountain Observatory Chinese Academy of Sciences 10 Yuanhua Road Nanjing210008 China Department of Physics and Astronomy University of Pennsylvania 209 South 33rd Street PhiladelphiaPA19104 United States Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Auf dem Hügel 69 BonnD-53121 Germany School of Physics & Astronomy Cardiff University The Parade CardiffCF24 3AA United Kingdom Division of Geological and Planetary Sciences California Institute of Technology PasadenaCA91125 United States Rosseland Centre for Solar Physics Institute of Theoretical Astrophysics University of Oslo Postboks 1029 Blindern OsloN-0315 Norway Haystack Observatory Massachusetts Institute of Technology 99 Millstone Road WestfordMA01886 United States National Astronomical Observatory of

Submillimeter and millimeter wavelengths provide a unique view of theUniverse, from the gas and dust that fills and surrounds galaxies to thechromosphere of our own Sun. Current single-dish facilities have presented atantalising view of the brightest (sub-)mm sources, and interferometers haveprovided the exquisite resolution necessary to analyse the details in smallfields, but there are still many open questions that cannot be answered withcurrent facilities. In this report we summarise the science that is guiding thedesign of the Atacama Large Aperture Submillimeter Telescope (AtLAST). Wedemonstrate how tranformational advances in topics including star formation inhigh redshift galaxies, the diffuse circumgalactic medium, Galactic ecology,cometary compositions and solar flares motivate the need for a 50m, single-dishtelescope with a 1-2 degree field of view and a new generation of highlymultiplexed continuum and spectral cameras. AtLAST will have the resolution todrastically lower the confusion limit compared to current single-dishfacilities, whilst also being able to rapidly map large areas of the sky anddetect extended, diffuse structures. Its high sensitivity and large field ofview will open up the field of submillimeter transient science by increasingthe probability of serendipitous detections. Finally, the science cases listedhere motivate the need for a highly flexible operations model capable of shortobservations of individual targets, large surveys, monitoring programmes,target of opportunity observations and coordinated observations with otherobservatories. AtLAST aims to be a sustainable, upgradeable, multipurposefacility that will deliver orders of magnitude increases in sensitivity andmapping speeds over current and planned submillimeter observatories. © 2024, CC BY.

关键词： Photons

Position-based Power Allocation for Uplink HSRs Wireless Communication When Two Trains Encounter

学校读者我要写书评

暂无评论

Position-based Power Allocation for Uplink HSRs Wireless Com...

IEEE Global Communications Conference

作者： Tao Li Zhengchuan Chen Pingyi Fan Khaled Ben Letaief Tsinghua National Laboratory for Information Science and Technology (TNList) and Department of Electronic Engineering Tsinghua University Information Systems Technology and Design Pillar SUTD Department of Electrical and Computer Engineering HKUST

ISBN: (纸本)9781509013296

Highly mobile wireless communication attracts much more attention currently due to the rapid development of high speed railways (HSRs) all over the world. Although the single train scenario has been well studied by now, two trains encountering scenario over the general two-way railways is also an important problem deserving to investigate. To this end, this paper concentrates on the uplink information transmission of HSRs in the two trains encountering scenario, which is modeled as a time-varying partial multiple access channel. In order to evaluate the transmission performance, the achievable rate region is utilized as a metric to characterize the tradeoff between the rates that each train can obtain under limited channel source constraint. With the help of superposition modulation and sequential interference cancelling, an optimal adaptive power allocation scheme aided by real-time position information is proposed to achieve the maximal boundary of the achievable rate region, namely alleviating the effect of encountering on information transmission to the largest extent. According to the numerical results, great improvement can be obtained by new proposed adaptive power allocation along time.

关键词： Highly mobile wireless communication Achievable rate region Position-based power allocation achievable rate region power splitting TRAIN CARRIER SYSTEM data transmission adaptive power allocation up link Transmission Characteristics ENCOUNTERS tradeoffs

A high-speed interconnect-model in s-domain

学校读者我要写书评

暂无评论

A high-speed interconnect-model in s-domain

IEEE MTT-S Latin America Microwave Conference (LAMC)

作者： Rodriguez R. Carlos J. L. Naredo R. Parra Michel O. Longoria Intel Guadalajara Design Center Zapopan Jalisco Mexico Cinvestav Guadalajara Department of Electrical Engineering and Computer Sciences Jalisco Mexico ITESO Department of electronics Systems and Computer Science Guadalajara Jalisco Mexico

ISBN: (纸本)9781509042883

This paper presents a Laplace or s-domain model to analyze high speed interconnects and proposes its use as complement to models based on time domain techniques. This model provides transient responses by applying an inverse numerical Laplace transform to functions describing PCB-interconnects as multiconductor transmission lines (MTLs) in frequency domain. As compared to Fourier-transform-based models, the one presented here provides a highly effective means to control aliasing errors. Comparisons of the s-domain model with two commercial-grade ones are included here to demonstrate its effectiveness.

关键词： Integrated circuit interconnections Computational modeling Conductors Time-domain analysis Numerical models Frequency-domain analysis Laplace equations

Routing entanglement in the quantum internet

学校读者我要写书评

暂无评论

arXiv 2017年

作者： Pant, Mihir Krovi, Hari Towsley, Don Tassiulas, Leandros Jiang, Liang Basu, Prithwish Englund, Dirk Guha, Saikat Department of Electrical Engineering and Computer Science MIT CambridgeMA United States Quantum Information Processing group Raytheon BBN Technologies 10 Moulton Street CambridgeMA College of Information and Computer Sciences University of Massachusetts AmherstMA United States School of Engineering and Applied Science Yale University 17 Hill House Avenue New HavenCT United States Departments of Applied Physics and Physics Yale University New HavenCT United States Yale Quantum Institute Yale University New HavenCT United States Advanced Networking Systems Raytheon BBN Technologies 10 Moulton Street CambridgeMA United States College of Optical Sciences University of Arizona 1630 East University Boulevard TucsonAZ United States

Remote quantum entanglement can enable numerous applications including distributed quantum computation, secure communication, and precision sensing. In this paper, we consider how a quantum network-nodes equipped with limited quantum processing capabilities connected via lossy optical links-can distribute high-rate entanglement simultaneously between multiple pairs of users (multiple flows). We develop protocols for such quantum "repeater" nodes, which enable a pair of users to achieve large gains in entanglement rates over using a linear chain of quantum repeaters, by exploiting the diversity of multiple paths in the network. Additionally, we develop repeater protocols that enable multiple user pairs to generate entanglement simultaneously at rates that can far exceed what is possible with repeaters time sharing among assisting individual entanglement flows. Our results suggest that the early-stage development of quantum memories with short coherence times and implementations of probabilistic Bell-state measurements can have a much more profound impact on quantum networks than may be apparent from analyzing linear repeater chains. This framework should spur the development of a general quantum network theory, bringing together quantum memory physics, quantum information theory, and computer network theory. Copyright © 2017, The Authors. All rights reserved.

关键词： Information theory