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作者： Prakash, N. Lalitha, V. Balaji, S.B. Vijay Kumar, P. Indian Institute of Science Bengaluru560 012 India Signal Processing and Communications Research Centre International Institute of Information Technology Hyderabad500 032 India Department of Electrical Communication Engineering Indian Institute of Science Bengaluru560 012 India Department of Electrical Communication Engineering Indian Institute of Science Bengaluru560 012 India Intel Labs HillsboroOR97124 United States Department of Electrical and Computer Engineering University of Southern California Los AngelesCA United States

Codes with locality are a class of codes introduced by Gopalan et al. to efficiently repair a failed node, by minimizing the number of nodes contacted during repair. An [n,k] systematic code is said to have information locality r , if each message symbol can be recovered by accessing ≤q r other symbols. An [n,k] code is said to have all-symbol locality r , if each code symbol can be recovered by accessing ≤ r other symbols. In this paper, we consider a generalization of codes with all-symbol locality to the case of handling two erasures. We study codes with locality that can recover from two erasures via a sequence of two local, parity-check computations. We refer to these codes as sequential-recovery locally repairable codes (denoted by 2-seq LR codes). Earlier approaches to handling multiple erasures considered recovery in parallel;the sequential approach allows us to potentially construct codes with improved minimum distance. We derive an upper bound on the rate of 2-seq LR codes. We provide constructions based on regular graphs which are rate-optimal with respect to the derived bound. We also characterize the structure of any rate-optimal code. By studying the Generalized Hamming Weights of the dual code, we derive a recursive upper bound on the minimum distance of 2-seq LR codes. We also provide constructions of a family of codes based on Turán graphs, that are optimal with respect to this bound. We also present explicit distance-optimal Turán graph based constructions of 2-seq LR codes for certain parameters. Our approach also leads to a new bound on the minimum distance of codes with all-symbol locality for the single-erasure case. © 1963-2012 IEEE.

关键词： Recovery

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Spectral and energy efficiency of IRS-assisted MISO communication with hardware impairments

arXiv

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arXiv 2020年

作者： Zhou, Shaoqing Xu, Wei Wang, Kezhi Di Renzo, Marco Alouini, Mohamed-Slim National Mobile Communications Research Laboratory Southeast University Nanjing210096 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Purple Mountain Laboratories Nanjing211111 China Department of Computer and Information Sciences Northumbria University Newcastle upon TyneNE1 8ST United Kingdom Université Paris-Saclay CNRS CentraleSupélec Laboratoire des Signaux et Systèmes Gif-sur-Yvette France Division of Computer Electrical and Mathematical Science and Engineering King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia

In this letter, we analyze the spectral and energy efficiency of an intelligent reflecting surface (IRS)-assisted multiple-input single-output (MISO) downlink system with hardware impairments. An extended error vector magnitude (EEVM) model is utilized to characterize the impact of radio-frequency (RF) impairments at the access point (AP) and phase noise is considered for the imperfect IRS. We show that the spectral efficiency is limited due to the hardware impairments even when the numbers of AP antennas and IRS elements grow infinitely large, which is in contrast with the conventional case with ideal hardware. Moreover, the performance degradation at high SNR is shown to be mainly affected by the AP hardware impairments rather than the phase noise of IRS. We further obtain the optimal transmit power in closed form for energy efficiency maximization. Simulation results are provided to verify these results. Copyright © 2020, The Authors. All rights reserved.

关键词： Energy efficiency

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Risk-Sensitive Task Fetching and Offloading for Vehicular Edge Computing

arXiv

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arXiv 2019年

作者： Batewela, Sadeep Liu, Chen-Feng Bennis, Mehdi Suraweera, Himal A. Hong, Choong Seon Nokia Networks Tampere33100 Finland Centre for Wireless Communications University of Oulu Oulu90014 Finland Centre for Wireless Communications University of Oulu Oulu90014 Finland Department of Computer Science and Engineering Kyung Hee University Yongin17104 Korea Republic of Department of Electrical and Electronic Engineering University of Peradeniya Peradeniya20400 Sri Lanka Department of Computer Science and Engineering Kyung Hee University Yongin17104 Korea Republic of

This letter studies an ultra-reliable low latency communication problem focusing on a vehicular edge computing network in which vehicles either fetch and synthesize images recorded by surveillance cameras or acquire the synthesized image from an edge computing server. The notion of risk-sensitive in financial mathematics is leveraged to define a reliability measure, and the studied problem is formulated as a risk minimization problem for each vehicle’s end-to-end (E2E) task fetching and offloading delays. Specifically, by resorting to a joint utility and policy estimation-based learning algorithm, a distributed risk-sensitive solution for task fetching and offloading is proposed. Simulation results show that our proposed solution achieves performance improvements up to 40% variance reduction and steeper distribution tail of the E2E delay over an averaged-based baseline. Copyright © 2019, The Authors. All rights reserved.

关键词： 5G mobile communication systems

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A bibliometric study of the research area of videogames using *** database

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Procedia computer Science 2019年 162卷 737-744页

作者： Pablo García-Sánchez Antonio M. Mora Pedro A. Castillo Ignacio J. Pérez Department of Computer Science and Engineering Universtiy of Cádiz Escuela Superior de Ingeniería Avda. de la Universidad 10 Puerto Real 11519 Cádiz Spain Department of Signal Theory Telematics and Communications ETSIIT-CITIC University of Granada Calle Periodista Daniel Saucedo Aranda s/n Granada Spain Department of Computer Science and Computer Architecture ETSIIT-CITIC University of Granada Calle Periodista Daniel Saucedo Aranda s/n Granada Spain

Videogames are a very interesting area of research for fields as diverse as computer science, health, psychology or even social sciences. Every year a growing number of articles are published in different topics inside this field, so it is very convenient to study the different bibliometric data in order to consolidate the research efforts. Thus, the aim of this work is to conduct a study on the distribution of articles related to videogames in the different fields of research, as well as to measure their interest over time, to identify the sources, countries and authors with the highest scientific production. In order to carry out this analysis, the information system *** has been considered, since it covers a large number of documents and allows for easy downloading and analysis of datasets. According to the study, three countries are the most prolific in this area: USA, Canada and UK. The obtained results also indicate that the fields with the highest number of publications are Information and computer Sciences, Medical and Health Sciences, and Psychology and Cognitive Sciences, in this order. With regard to the impact of the publications, differences between the number of citations, and the number of Altmetric Attention Score, have been found.

关键词： videogames Dimensions.ai bibliometrics scientometrics

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A crowdsourcing framework for on-device federated learning

arXiv

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arXiv 2019年

作者： Pandey, Shashi Raj Tran, Nguyen H. Bennis, Mehdi Tun, Yan Kyaw Manzoor, Aunas Hong, Choong Seon Department of Computer Science and Engineering Kyung Hee University Yongin-si Gyeonggi-do17104 Korea Republic of School of Computer Science University of Sydney NSW2006 Australia Center for Wireless Communications University of Oulu Oulu90014 Finland

Federated learning (FL) rests on the notion of training a global model in a decentralized manner. Under this setting, mobile devices perform computations on their local data before uploading the required updates to improve the global model. However, when the participating clients implement an uncoordinated computation strategy, the difficulty is to handle the communication efficiency (i.e., the number of communications per iteration) while exchanging the model parameters during aggregation. Therefore, a key challenge in FL is how users participate to build a high-quality global model with communication efficiency. We tackle this issue by formulating a utility maximization problem, and propose a novel crowdsourcing framework to leverage FL that considers the communication efficiency during parameters exchange. First, we show an incentive-based interaction between the crowdsourcing platform and the participating client's independent strategies for training a global learning model, where each side maximizes its own benefit. We formulate a two-stage Stackelberg game to analyze such scenario and find the game's equilibria. Second, we formalize an admission control scheme for participating clients to ensure a level of local accuracy. Simulated results demonstrate the efficacy of our proposed solution with up to 22% gain in the offered reward. Copyright © 2019, The Authors. All rights reserved.

关键词： Crowdsourcing

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Sign Language Translator using the Back Propagation Algorithm of an MLP

Sign Language Translator using the Back Propagation Algorith...

引用

IEEE International Conference on Future Internet of Things and Cloud Workshops (FiCloudW)

作者： Gaby Abou Haidar Roger Achkar Dian Salhab Antoine Sayah Fadi Jobran American University of Science and Technology Beirut Lebanon Department of Computer and Communications Engineering American University of Science and Technology AUST Beirut Lebanon American University of Science and Technology

ISBN: (数字)9781728144115

ISBN: (纸本)9781728144122

Although technology has been evolving rapidly in this information age, deaf/mute people still use sign language as their only way of communication. Using sign language as a communication tool can be beneficial among those who are familiar with this language, but the problem remains when communicating with the wider community. Sign Language Translator is the appropriate solution that enables deaf/mute people to communication fluently through technology in different languages. It is a combination of two gloves with the required sensors and a smart phone that contains the mobile application that translates the hand gestures into spoken words, is based on the Lebanese Sign Language; Artificial Neural Networks plays a big role in releasing the exact output.

关键词： backpropagation data gloves handicapped aids language translation mobile computing multilayer perceptrons natural language processing sign language recognition smart phones Smartphone Handicapped accessibility data gloves back propagation handicapped aids Multilayer perceptrons Natural Language Processing Mobile Computing interpreters sign language recognition CSRP3 gene Communication tools translator

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Generalized Bussgang LMMSE Channel Estimator for One-Bit Massive MIMO Systems

Generalized Bussgang LMMSE Channel Estimator for One-Bit Mas...

引用

IEEE Global communications Conference

作者： Qian Wan Jun Fang Zhi Chen Hongbin Li National Key Laboratory on Communications University of Electronic Science and Technology of China Chengdu China Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

We consider the problem of channel estimation for uplink massive multiple-input multiple-output systems, where one-bit analog-to-digital converters (ADCs) are used at the base station (BS) to quantize the received signal. In this paper, we study the problem of one-bit quantizer design when a Bussgang linear minimum mean square error (BLMMSE) estimator is used for channel estimation. We first extend the conventional Bussgang LMMSE estimator to the general nonzero threshold case. We then analyze the estimation performance of the generalized Bussgang LMMSE estimator and investigate the design of quantization thresholds. A gradient descent scheme is developed to search for optimal quantization thresholds. Simulation results show that, with carefully devised quantization thresholds, the generalized Bussgang LMMSE estimator can achieve a substantial performance improvement over the conventional Bussgang LMMSE estimator.

关键词： Covariance matrices Channel estimation MIMO communication Quantization (signal) Receiving antennas Estimation

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An improved indoor localization solution using a hybrid UWB-Doppler system with Kalman filter

An improved indoor localization solution using a hybrid UWB-...

引用

2018 IEEE Radio and Wireless Symposium, RWS 2018

作者： Wang, Jing Tang, Yao Munoz-Ferreras, Jose-Maria Gomez-Garcia, Roberto Li, Changzhi Department of Electrical and Computer Engineering Texas Tech University Lubbock United States Department of Signal Theory and Communications University of Alcalá Alcalá de Henares Spain

ISBN: (纸本)9781538607091

Ultra-wideband (UWB) positioning system has gained much attention in the field of indoor localization due to its various advantages. The narrow pulse nature of UWB signal results in a very large bandwidth which enables high resolution positioning, low loss penetration, and low cost. However, practically, the low transmit power severely restrains the transmission range of UWB signal so that it is only suitable for short-range accurate ranging. Therefore, a novel hybrid UWB-Doppler system was proposed by using a fixed UWB positioning system monitored region to calibrate the accumulated error of a Doppler-gyroscope trajectory-tracking system. In this paper, we present improved indoor localization performance using the hybrid UWB-Doppler system employing the Kalman Filter. Experiments were conducted in a large complex indoor environment to further demonstrate the feasibility of the proposed indoor localization method. © 2018 IEEE.

关键词： Kalman filters

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THz Generation Control in Fe/X Spintronic Multilayers by chemical bonding at epitaxial Fe/GaAs(001) interfaces

THz Generation Control in Fe/X Spintronic Multilayers by che...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Roman Adam Genyu Chen Daniel E. Bürgler Derang Cao Sarah Heidtfeld Debamitra Chakraborty Jing Cheng Ivan Komissarov Hilde Hardtdegen Martin Mikulics Claus M. Schneider Roman Sobolewski Research Centre Jülich Peter Grünberg Institute (PGI-6) Jülich Germany Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics University of Rochester Rochester New York USA College of Physics Center for Marine Observation and Communications Qingdao University Qingdao China Department of Electrical and Computer Engineering University of Rochester Rochester New York USA Research Centre Jülich Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons Jülich Germany Department of Physics University of California Davis Davis California USA

We report an additional degree of control of THz transients in Fe/X spintronic emitters grown on GaAs(001). We ascribe the field-independent enhancement of the THz amplitude to specific chemical bonding at the epitaxi... 详细信息

ISBN: (纸本)9781943580910

关键词： Electromagnetic radiation Free electron lasers Gallium arsenide Magnetic fields Terahertz generation Ultrafast lasers

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Initialization of Active Contour for Dermoscopic Image Segmentation: A Comparative Study

Initialization of Active Contour for Dermoscopic Image Segme...

引用

2018 IEEE International Symposium on Signal Processing and Information Technology, ISSPIT 2018

作者： Nagieb, Reham Mohamed Ashour, Amira S. Guo, Yanhui El-Khobby, Heba A. Elnaby, Mustafa M. Abd Department of Electronics and Electrical Communications Faculty of Engineering Tanta University Tanta Egypt Department of Computer Science University of Illinois at Springfield SpringfieldIL United States

ISBN: (纸本)9781538675687

Segmentation is an important step in medical image processing and analysis. Active contour (AC) is the one of the most effective methods for image segmentation. In this paper, the model of active contour without edge is used to segment the lesions in dermoscopic images, where it is more effective than the traditional snake. However, its performance depends on the initial curve. This motivates the current work to apply different shape of mask as an initial contour of Chan-Vese segmentation method to study the segmentation performance on the dermoscopic image. Evaluation metrics are calculated to measure the segmentation performance. The experimental results establish that the circular initial mask provids the best performance, where it is approximately has the same shape of the skin lesion regions. In addition, this initial circular mask achieves the best segmentation performance if it has 49% size from the whole dermoscopic image size. © 2018 IEEE.

关键词： Image segmentation

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