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arXiv 2020年

作者： Wu, Xiongwei Li, Qiang Lu, Yawei Poor, H. Vincent Leung, Victor C.M. Ching, P.C. Department of Electronic Engineering Chinese University of Hong Kong Hong Kong Department of Electrical Engineering Princeton University Princeton United States School of Info. & Comm. Eng. University of Electronic Science and Technology of China Chengdu China Department of Electronic Engineering Tsinghua University Beijing China College of Computer Science & Software Engineering Shenzhen University Shenzhen China Department of Electrical & Computer Engineering University of British Columbia Canada

Unmanned aerial vehicles (UAVs) can be utilized as aerial base stations to provide comm.nication service for remote mobile users due to their high mobility and flexible deployment. However, the line-of-sight (LoS) wireless links are vulnerable to be intercepted by the eavesdropper (Eve), which presents a major challenge for UAV-aided comm.nications. In this paper, we propose a latency-minimized transmission scheme for satisfying legitimate users’ (LUs’) content requests securely against Eve. By leveraging physical-layer security (PLS) techniques, we formulate a transmission latency minimization problem by jointly optimizing the UAV trajectory and user association. The resulting problem is a mixed-integer nonlinear program (MINLP), which is known to be NP hard. Furthermore, the dimension of optimization variables is indeterminate, which again makes our problem very challenging. To efficiently address this, we utilize bisection to search for the minimum transmission delay and introduce a variational penalty method to address the associated subproblem via an inexact block coordinate descent approach. Moreover, we present a characterization for the optimal solution. Simulation results are provided to demonstrate the superior performance of the proposed design. Copyright © 2020, The Authors. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Joint long-term cache allocation and short-term content delivery in green cloud small cell networks

arXiv

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arXiv 2019年

作者： Wu, Xiongwei Li, Qiang Li, Xiuhua Leung, Victor C.M. Ching, P.C. Dept. of Electronic Engineering Chinese University of Hong Kong Shatin Hong Kong School of Info. & Comm. Eng. University of Electronic Science and Technology of China Chengdu China School of Big Data & Software Engineering Chongqing University Chongqing China College of Computer Science & Software Engineering Shenzhen University Shenzhen China Dept. of Electrical & Computer Engineering University of British Columbia Vancouver Canada

Recent years have witnessed an exponential growth of mobile data traffic, which may lead to a serious traffic burn on the wireless networks and considerable power consumption. Network densification and edge caching are effective approaches to addressing these challenges. In this study, we investigate joint long-term cache allocation and short-term content delivery in cloud small cell networks (C-SCNs), where multiple smallcell BSs (SBSs) are connected to the central processor via fronthaul and can store popular contents so as to reduce the duplicated transmissions in networks. Accordingly, a long-term power minimization problem is formulated by jointly optimizing multicast beamforming, BS clustering, and cache allocation under quality of service (QoS) and storage constraints. The resultant mixed timescale design problem is an anticausal problem because the optimal cache allocation depends on the future file requests. To handle it, a two-stage optimization scheme is proposed by utilizing historical knowledge of users' requests and channel state information. Specifically, the online content delivery design is tackled with a penalty-based approach, and the periodic cache updating is optimized with a distributed alternating method. Simulation results indicate that the proposed scheme significantly outperforms conventional schemes and performs extremely close to a genie-aided lower bound in the low caching region. Copyright © 2019, The Authors. All rights reserved.

关键词： Channel state information

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Characteristics of RoF Millimeter-wave Generation for 5G System

Characteristics of RoF Millimeter-wave Generation for 5G Sys...

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International Symposium on Advanced Electrical and comm.nication Technologies (ISAECT)

作者： Syamsuri Yaakob Mohd Rashidi Che Beson Romli Mohamad Zuraidah Zan Muhammad Zamzuri Abdul Kadir Sevia Mahdaliza Idrus WIPNET Dept. of Computer and Comm. Sys. Eng Fac. of Engineering Universiti Putra Malaysia Serdang Selangor Malaysia School of Computer and Communication Engineering Universiti Malaysia Perlis Kangar Malaysia Telekom Research & Development (TMR&D) Lingkaran Teknokrat Timur Selangor Malaysia Kulliyyah of Science International Islamic University Malaysia Kuantan Pahang Malaysia Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia

ISBN: (数字)9781728137292

ISBN: (纸本)9781728137308

An optical millimeter-wave (mm-wave) generation system is designed to be incorporated with radio over fibre (RoF) system for 5G application. The design employs the dual-sideband optical carrier suppression (DSB-OCS) technique with a dual-electrode Mach-Zehnder modulator (DE-MZM). A mm-wave of 40 GHz is generated with the intention to be used as a wireless carrier for the distribution of 1.25 Gbps data via direct modulation (DM) over a 20 km RoF system. The result shows that the system has a phase noise of -90 dBc at 1kHz frequency offset and achieves bit error rate (BER) of 10 -9 with modulation index, m above a figure of 0.5.

关键词： Optical attenuators Optical fibers Optical modulation Optical filters Optical amplifiers

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Derandomized Distributed Multi-resource Allocation with Little comm.nication Overhead

arXiv

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arXiv 2018年

作者： Alam, Syed Eqbal Shorten, Robert Wirth, Fabian Yu, Jia Yuan CIISE Concordia University MontrealQC Canada School of Electrical Electronic and Comm. Engineering University College Dublin Dublin Ireland Faculty of Computer Science and Mathematics University of Passau Passau Germany

We study a class of distributed optimization problems for multiple shared resource allocation in Internet-connected devices. We propose a derandomized version of an existing stochastic additive-increase and multiplicative-decrease (AIMD) algorithm. The proposed solution uses one bit feedback signal for each resource between the system and the Internet-connected devices and does not require inter-device comm.nication. Additionally, the Internet-connected devices do not compromise their privacy and the solution does not dependent on the number of participating devices. In the system, each Internet-connected device has private cost functions which are strictly convex, twice continuously differentiable and increasing. We show empirically that the long-term average allocations of multiple shared resources converge to optimal allocations and the system achieves minimum social cost. Furthermore, we show that the proposed derandomized AIMD algorithm converges faster than the stochastic AIMD algorithm and both the approaches provide approximately same solutions. Copyright © 2018, The Authors. All rights reserved.

关键词： Resource allocation

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Power gating and its repercussions - A review 1

Power gating and its repercussions - A review

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1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016

作者： Verma, Preeti Noor, Arti Sharma, Ajay K. Sampath Kumar, V. Electronics and Comm. Engineering Department National Institute of Technology Delhi India School of Electronics Centre for Development of Advanced Computing Noida India Computer Science and Engineering Department National Institute of Technology Delhi India Electronics and Comm. Engineering Department JSS Academy of Technical Education Noida India

ISBN: (纸本)9781467385879

In this paper, Power gating/ Multithreshold technique for low power circuit design is summarized and compared. Few important and vital parameters such as sizing of sleep transistor, mode transition energy, reduction of noise due to ground bounce, area, delay and noise margin are compared for different techniques. In charge recycling technique upto 43% of mode transition energy is saved and an average of 8.25%, 33.1% of reduction in positive and negative peak ground bounce is obtained respectively. Bin-Packaging technique for clustering gives more leakage saving (84%) with respect to cell-partitioning technique. Considering overall response, Dynamic forward body bias triode MTCMOS technique (DFBBL) is found to be the best for sequential circuit (32-bit shift register) and for combinational circuit (32-bit Brent kung adder), triple phase technique gives the best response. Digital triple phase technique improves the overall electrical quality by 9.15 times and overall tolerance to parameter variations by 183.1 times as compared to other slew rate modulation techniques. DFBBL technique gives ground bounce reduction upto 90% and it also reduces the active power consumption about 47.3%. The data stability of sequential circuits is improved by 16.92%. © 2016 IEEE.

关键词： Shift registers

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Robust and efficient multipath Interest forwarding for NDN-based MANETs 9

Robust and efficient multipath Interest forwarding for NDN-b...

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9th IFIP Wireless and Mobile Networking Conference, WMNC 2016

作者： Rehman, Rana Asif Hieu, Tran Dinh Bae, Hong-Min Mah, Sung-Hoon Kim, Byung-Seo Department of Electronics and Computer Engineering Graduate School Hongik University Sejong City30016 Korea Republic of Department of Computer and Info. Comm. Engineering Hongik University Sejong City30016 Korea Republic of

ISBN: (纸本)9781467387460

Named data networking (NDN) paradigm solves various issues of current TCP/IP based Internet and considers as a good candidate for future Internet architecture. It has a simple comm.nication mechanism based on named contents instead of their physical locations. In NDN-based mobile ad hoc networks (MANETs), the participating nodes have limited resources. Interest message flooding is a key research issue in this area. Due to Interest message flooding, the participant nodes frequently take part in the forwarding process and die earlier because of limited remaining energy. In this study, by leverages the benefits of NDN paradigm, we have proposed a new scheme, named robust and efficient multipath Interest forwarding (REMIF) for NDN-based MANETs. Performance of the proposed REMIF scheme is investigated by using ndnSIM. The results show that proposed scheme performs better in terms of content download time and the total number of Interest messages injected in the network. © 2016 IEEE.

关键词： Mobile ad hoc networks

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Robust Secrecy Rate Optimization for Full-Duplex Bidirectional comm.nications

Robust Secrecy Rate Optimization for Full-Duplex Bidirection...

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IEEE Global comm.nications Conference

作者： Ying Zhang Qiang Li Jingran Lin Sissi Xiaoxiao Wu School of Comm. & Info. Engineering University of Electronic Science and Technology of China School of Electrical Computer & Energy Engineering Arizona State University

ISBN: (纸本)9781509013296

This paper considers the physical-layer secrecy design for full-duplex (FD) bidirectional comm.nications in the presence of an eavesdropper (Eve). The goal of this work is to maximize the sum secrecy rate (SSR) of the bidirectional transmissions via appropriately designing the transmit covariance matrices at the legitimate nodes. To this end, we propose an alternating difference-of-concave (ADC) approach to iteratively optimizing the transmit covariance matrices. We show that each ADC iteration can be carried out efficiently with a semi-closed-form solution, and that every limit point of ADC iterations is a stationary solution of the SSR maximization problem. Besides the SSR maximization, this paper also deals with a robust SSR maximization problem to account for imperfect CSI of Eve. Assuming a moment-based random CSI error model (i.e., only mean and covariance of the error are known, but the exact distribution is not known), robust transmit designs based on Markov's inequality and the robust conic reformulation are developed. The efficacy of the proposed designs is demonstrated through simulations.

关键词： Robustness Silicon Signal to noise ratio Interference Covariance matrices Programming Convergence

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Power Gating and Its Repercussions--A Review

Power Gating and Its Repercussions--A Review

引用

International Conference on Power Electronics, Intelligent Control and Energy Systems

作者： Preeti Verma Arti Noor Ajay K. Sharma Sampath Kumar V. Electronics & Comm. Engineering Department National Institute of Technology Delhi India School of Electronics Centre for Development of Advanced Computing Noida India Computer Science & Engineering Department National Institute of Technology Delhi India Electronics and Comm. Engineering Department JSS Academy of Technical Education Noida India

ISBN: (纸本)9781467385886

In this paper, Power gating/Multithreshold technique for low power circuit design is summarized and compared. Few important and vital parameters such as sizing of sleep transistor, mode transition energy, reduction of noise due to ground bounce, area, delay and noise margin are compared for different techniques. In charge recycling technique upto 43% of mode transition energy is saved and an average of 8.25%, 33.1% of reduction in positive and negative peak ground bounce is obtained respectively. BinPackaging technique for clustering gives more leakage saving (84%) with respect to cell-partitioning technique. Considering overall response, Dynamic forward body bias triode MTCMOS technique (DFBBL) is found to be the best for sequential circuit (32-bit shift register) and for combinational circuit (32-bit Brent kung adder), triple phase technique gives the best response. Digital triple phase technique improves the overall electrical quality by 9.15 times and overall tolerance to parameter variations by 183.1 times as compared to other slew rate modulation techniques. DFBBL technique gives ground bounce reduction upto 90% and it also reduces the active power consumption about 47.3%. The data stability of sequential circuits is improved by 16.92%.

关键词： Leakage Power Stacking Charge Recycling Ground Bounce

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Monic Testing of Web Services Based on Algebraic Specifications

Monic Testing of Web Services Based on Algebraic Specificati...

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2016 IEEE Symposium on Service-Oriented System engineering (SOSE)

作者： Dongmei Liu Xian Wu Xin Zhang Hong Zhu Ian Bayley School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing P.R. China Dept of Compo. and Comm. Technologies Oxford Brookes University Oxford UK

Web services are designed to be discovered and composed dynamically, which implies that testing must also be done dynamically. This involves both the generation of test cases and the checking of test results. This paper presents algorithms for both of these using the technique of algebraic specification. It focuses in particular on the problem that web services, when they are third-party, have poor controllability and observability, and introduces a solution known as monic floating checkable test cases. A prototype tool has implemented the proposed testing technique and it is applied to a case study with a real industry application GoGrid, demonstrating that the technique is both applicable and feasible.

关键词： Web services Context Semantics Observability Software testing

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Evaluating the Ontological Semantic Description of Web Services Generated from Algebraic Specifications

Evaluating the Ontological Semantic Description of Web Servi...

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2016 IEEE Symposium on Service-Oriented System engineering (SOSE)

作者： Dongmei Liu Yunfei Yang Ying Chen Hong Zhu Ian Bayley Arantza Aldea School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing P.R. China Dept of Comp. and Comm. Technologies Oxford Brookes University Oxford UK

The semantics of web services can be described using ontology or formally specified in mathematical notations. The former is comprehensible and searchable, while the latter is testable and verifiable. To take advantage of both, we proposed, in our previous work, a transformation that takes an algebraic specification of a web service to generate a domain ontology and a semantic description of the service on that ontology. This paper investigates the quality of these two outputs by proposing a general framework of ontology evaluation that assesses them on 4 aspects of quality, which are decomposed into 8 factors and then measured by a set of 37 metrics. It reports a case study on 3 real-life examples of web services. The results show that the ontologies and semantic descriptions generated from formal specifications are of satisfactory quality.

关键词： Ontologies Semantics Measurement Vocabulary Web services Standards Redundancy

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