检索结果-南通市图书馆

A Secure Interaction and Control Method for InterClouds Services

在线全文

学校读者我要写书评

暂无评论

China communications 2015年第S2期12卷 132-137页

作者： GAN Jiefu PENG Li LU Yueming China information Security Certification Center school of information and communication engineering Beijing University of Posts and Telecommunications Key Laboratory of Trustworthy Distributed Computing and Service (bupt) Ministry of Education

Inter-clouds services build information bridges over computing clouds so as to provide the convenience for electronic commerce and other information services. However, the interactions between clouds have challenges in information disclosure, services spoofing and information inconsistent. This paper proposes a secure interaction and control method for inter-clouds services, which uses information encryption, digital signature,time logic control means, to protect users' privacy and keep the integrity and consistency of cloud customers' request information, and prevent the spoofing of information requests. The results show that the method could prevent the spoofing well in a stable network environment and improve the security of clouds sessions.

关键词： inter-clouds services encryption signature spoofing

Radio map updated method based on subscriber locations in indoor WLAN localization

在线全文

学校读者我要写书评

暂无评论

Journal of Systems engineering and Electronics 2015年第6期26卷 1202-1209页

作者： Ying Xia Zhongzhao Zhang Lin Ma school of Electronics and information engineering Harbin Institute of Technology school of communication and Electronic engineering Qiqihar University

With the rapid development of wireless local area network （WLAN） technology, an important target of indoor positioning systems is to improve the positioning accuracy while reducing the online calibration effort to overcome signal time-varying. A novel fingerprint positioning algorithm, known as the adaptive radio map with updated method based on hidden Markov model （HMM）, is proposed. It is shown that by using a collection of user traces that can be cheaply obtained, the proposed algorithm can take advantage of these data to update the labeled calibration data to further improve the position estimation accuracy. This algorithm is a combination of machine learning, information gain theory and fingerprinting. By collecting data and testing the algorithm in a realistic indoor WLAN environment, the experiment results indicate that, compared with the widely used K nearest neighbor algorithm, the proposed algorithm can improve the positioning accuracy while greatly reduce the calibration effort.

关键词： subscriber location wireless local area network(WLAN) positioning accuracy calibration effort hidden Markovmodel (HMM).

Mobility-Aware Partial Computation Offloading in Vehicular Networks: A Deep Reinforcement Learning Based Scheme

在线全文

学校读者我要写书评

暂无评论

China communications 2020年第10期17卷 31-49页

作者： Jianfei Wang Tiejun Lv Pingmu Huang P.Takis Mathiopoulos school of information and communication engineering Beijing University of Posts and Telecommunications(BUPT)Beijing 100876China Department of Informatics and Telecommunications National and Kapodistrian University of AthensAthens 15784Greece

Encouraged by next-generation networks and autonomous vehicle systems,vehicular networks must employ advanced technologies to guarantee personal safety,reduce traffic accidents and ease traffic *** leveraging the computing ability at the network edge,multi-access edge computing(MEC)is a promising technique to tackle such *** to traditional full offloading,partial offloading offers more flexibility in the perspective of application as well as deployment of such ***,in this paper,we investigate the application of partial computing offloading in-vehicle *** particular,by analyzing the structure of many emerging applications,e.g.,AR and online games,we convert the application structure into a sequential multi-component *** on shortening the application execution delay,we extend the optimization problem from the single-vehicle computing offloading(SVCOP)scenario to the multi-vehicle computing offloading(MVCOP)by taking multiple constraints into account.A deep reinforcement learning(DRL)based algorithm is proposed as a solution to this *** performance evaluation results have shown that the proposed algorithm achieves superior performance as compared to existing offloading mechanisms in deducing application execution delay.

关键词： partial offloading MEC fog computing vehicular networks D2D AR

Performance analysis for MU-MIMO enabled LTE-U networks coexisting with D2D and WiFi network

在线全文

学校读者我要写书评

暂无评论

Digital communications and Networks 2024年第5期10卷 1289-1296页

作者： Errong Pei Chenkai Ren Wei Li Qimei Chen Bingguang Deng Jiarui Song school of communication and information engineering Chongqing University of Posts and Telecommunications Chongqing Jinmei communication Co. Ltd Electronic information school Wuhan University

LTE-Unlicensed(LTE-U) network is a type of cellular communication network operating the unlicensed *** cellular traffic to WiFi or Device-to-Device(D2D) network can lead to interference among *** Multiple-Input Multiple-Output(MIMO) technology in Cellular Base Station(CBS) and WiFi Access Point(WAP) can effectively reduce interference among D2D,WiFi and cellular *** our best knowledge,there is still no literature to explicitly study the characteristics of the traffic offloading in the Multiple-User MIMO(MU-MIMO) enabled network coexisting with D2D and WiFi *** this article,we thoroughly investigate the impact of D2D communication and MU-MIMO enabled WAP and CBS on the performance of the LTE-U *** specifically,we derive the expressions of the downlink rates for cellular users,D2D users,and WiFi users with incomplete Channel State information(CSI) feedback,and we validate our analysis through Monte-Carlo *** results illustrate the following conclusions.(ⅰ) Increasing the number of WiFi users,the length of CSI feedback,and the quantity of D2D pairs that reuse the channel with a single cellular user can increase the total throughput of the heterogeneous network.(ⅱ) The total throughput decreases when more than two users are offloaded to D2D pairs,and increases as the number of offloaded users increases when less than six users are offloaded to WiFi network.(ⅲ) Simultaneously offloading traffic to D2D pairs and WiFi network can obtain higher total throughput than offloading traffic to only one of them.

关键词： LTE-unlicensed WiFi AP MU-MIMO D2D

Closed form algorithm of double-satellite TDOA+AOA localization based on WGS-84 model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2019年第10期32卷 2354-2367页

作者： Wanchun LI Ruibin CHEN Yuning GUO Caixia FU school of information and communication engineering University of Electronic Science and Technology of China

In this paper,we consider the double-satellite localization under the earth ellipsoid model of the Wideband Geodetic System(WGS-84)using the Time Difference of Arrival(TDOA)and the Angle-of-Arrival(AOA).Several closed-form solution algorithms via the pseudolinearization of the measurement equations are presented to efficiently estimate the *** algorithms include the Weighted Least Squares(WLS),the Constrained Total Least Squares(CTLS),and the Taylor-Series Iteration(TSI).Performance comparison of the proposed methods with the Cramér-Rao Lower Bound(CRLB)in the simulation is shown to demonstrate that the proposed algorithms are feasible and have stable performance.

关键词： Angle-of-Arrival(AOA) Constrained Total Least Squares(CTLS) Cramér-Rao Lower Bound(CRLB) Double-satellite positioning system Taylor-Series Iteration(TSI) Time Difference of Arrival(TDOA) Weighted Least Squares(WLS) Wideband Geodetic System(WGS-84)

Energy-efficient computing-in-memory architecture for AI processor: device, circuit, architecture perspective

在线全文

学校读者我要写书评

暂无评论

Science China(information Sciences) 2021年第6期64卷 45-59页

作者： Liang CHANG Chenglong LI Zhaomin ZHANG Jianbiao XIAO Qingsong LIU Zhen ZHU Weihang LI Zixuan ZHU Siqi YANG Jun ZHOU school of information and communication engineering University of Electronic Science and Technology of China

An artificial intelligence(AI) processor is a promising solution for energy-efficient data processing, including health monitoring and image/voice recognition. However, data movements between compute part and memory induce memory wall and power wall challenges to the conventional computing ***, the memory-centric architecture has been revised to solve the data movement issue, where the memory is equipped with the compute-capable memory technique, namely, computing-in-memory(CIM). In this paper, we analyze the requirement of AI algorithms on the data movement and low power requirement of AI processors. In addition, we introduce the story of CIM and implementation methodologies of CIM architecture. Furthermore, we present several novel solutions beyond traditional analog-digital mixed static random-access memory(SRAM)-based CIM architecture. Finally, recent CIM tape-out studies are listed and discussed.

关键词： energy efficiency computing-in-memory non-volatile memory test demonstrators AI processor

A simplified decoding algorithm for multi-CRC polar codes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems engineering and Electronics 2020年第1期31卷 12-18页

作者： YANG Haifen YAN Suxin ZHANG Hao REN Yan HU Xiangdong LIN Shuisheng school of information and communication engineering University of Electronic Science and Technology of China

Polar codes represent one of the major breakthroughs in 5G standard,and have been proven to be able to achieve the symmetric capacity of binary-input discrete memoryless channels using the successive cancellation list(SCL)decoding ***,the SCL algorithm suffers from a large amount of memory *** paper proposes an adaptive simplified decoding algorithm for multiple cyclic redundancy check(CRC)polar *** results show that the proposed method can reduce the decoding complexity and memory *** can also acquire the performance gain in the low signal to noise ratio region.

关键词： polar code successive cancellation list(SCL) cyclic redundancy check(CRC) adaptive decoding

Decoherence suppression for three-qubit W-like state using weak measurement and iteration method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第8期25卷 71-76页

作者：杨光廉保旺聂敏 Department of communication engineering School of Electronics and Information Northwestern Polytechnical University

Multi-qubit entanglement states are the key resources for various multipartite quantum communication tasks. For a class of generalized three-qubit quantum entanglement, W-like state, we demonstrate that the weak measurement and the reversal measurement are capable of suppressing the amplitude damping decoherence by reducing the initial damping factor into a smaller equivalent damping factor. Furthermore, we propose an iteration method in the weak measurement and the reversal measurement to enhance the success probability of the total measurements. Finally, we discuss how the number of the iterations influences the overall effect of decoherence suppression, and find that the ＂half iteration＂ method is a better option that has more practical value.

关键词： quantum decoherence W-like state amplitude damping weak measurement

Joint 2D DOA and Doppler frequency estimation for L-shaped array using compressive sensing

在线全文

学校读者我要写书评

暂无评论

Journal of Systems engineering and Electronics 2020年第1期31卷 28-36页

作者： WANG Shixin ZHAO Yuan LAILA Ibrahim XIONG Ying WANG Jun TANG Bin school of information and communication engineering University of Electronic Science and Technology of China

A joint two-dimensional(2D)direction-of-arrival(DOA)and radial Doppler frequency estimation method for the L-shaped array is proposed in this paper based on the compressive sensing(CS)*** from the conventional CS-based methods where the joint spatial-temporal parameters are characterized in one large scale matrix,three smaller scale matrices with independent azimuth,elevation and Doppler frequency are introduced adopting a separable observation ***,the estimation is achieved by L1-norm minimization and the Bayesian CS *** addition,under the L-shaped array topology,the azimuth and elevation are separated yet coupled to the same radial Doppler ***,the pair matching problem is solved with the aid of the radial Doppler ***,numerical simulations corroborate the feasibility and validity of the proposed algorithm.

关键词： electronic warfare L-shaped array joint parameter estimation L1-norm minimization Bayesian compressive sensing(CS) pair matching