检索结果-南通市图书馆

China Communications 2021年第9期18卷 I0003-I0004页

作者： Qinyu Zhang Xuejun Sha Fei Ji Ning Ge Harbin Institute of Technology(Shenzhen) system of MOE China communication research center Electronic Engineering South China University of Technology Department of electronics Engineering at Tsinghua University

Along with the swift growth of communication services,various networks have undergone multidimensional technical evolution,*** transmission speed and large bandwidth for ground cellular network,high mobility for aviation network,and wide-area coverage for satellite *** the industry demands for joint operation arise,an integrated space-air-ground collaboration network will be formed.

关键词： network SPACE aviation

Fuzzy-Based Dynamic Distributed Queue Scheduling for Packet Switched Networks

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2013年第2期28卷 357-365页

作者： Chollette C.Chude-Olisah Uche A.K.Chude-Okonkwo Kamalrulnizam A.Bakar Ghazali Sulong Faculty of Computing Universiti Teknologi Malaysia wireless Communication center Universiti Teknologi Malaysia

Addressing the problem of queue scheduling for the packet-switched system is a vital aspect of congestion control. In this paper, the fuzzy logic based decision method is adopted for queue scheduling in order to enforce some level of control for traffic of different quality of service requirements using predetermined values. The fuzzy scheduler proposed in this paper takes into account the dynamic nature of the Internet traffic with respect to its time-varying packet arrival process that affects the network states and performance. Three queues are defined, viz low, medium and high priority queues. The choice of prioritizing packets influences how queues are served. The fuzzy scheduler not only utilizes queue priority in the queue scheduling scheme, but also considers packet drop susceptibility and queue limit. Through simulation it is shown that the fuzzy scheduler is more appropriate for the dynamic nature of Internet traffic in a packet-switched system as compared with some existing queue scheduling methods. Results show that the scheduling strategy of the proposed fuzzy scheduler reduces packet drop, provides good link utilization and minimizes queue delay as compared with the priority queuing （PQ）, first-in-first-out （FIFO）, and weighted fair queuing （WFQ）.

关键词： fuzzy logic based decision method priority queue limit queue scheduling

Opportunistic access control for enhancing security in D2D-enabled cellular networks

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第4期61卷 187-198页

作者： Yajun CHEN Xinsheng JI Kaizhi HUANG Bin LI Xiaolei KANG National Digital Switching system Engineering & Technological R&D center National Mobile Communications research Laboratory Southeast University National Engineering Lab for Mobile Networking Security School of Information and electronics Beijing Institute of Technology

In this paper, we investigate secure communication over cellular uplinks in device-to-device(D2 D)-enabled cellular networks. We consider a more general scenario, in which multiple D2 D pairs could simultaneously share the same resource block with a specific cellular user. First, an opportunistic access control scheme based on wireless channel gains is proposed, by which the candidate selected set of D2 D pairs sharing the same resource block is determined. The proposed scheme could guarantee reliable communications for both cellular users and D2 D pairs, and further could combat eavesdroppers while keeping the legitimate cellular user as non-intrusive as possible, regarding D2 D pairs as friendly jammers in a non-collaborative way. Then, we derive theoretical results to characterize the security and reliability of the typical cellular and D2 D links, respectively. To further support the performance of this hybrid network, we next present an interference threshold optimization model. Our aim is to minimize the connection outage probability(COP)of D2 D pairs subject to the secrecy requirement of the cellular user. Finally, simulation results are presented to validate the effectiveness of our proposed scheme.

关键词： device-to-device(D2D) communication opportunistic access control physical layer security(PHY-security) secrecy outage probability(SOP) connection outage probability(COP)

Super-resolution DOA estimation for correlated off-grid signals via deep estimator

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 2022年第6期33卷 1096-1107页

作者： WU Shuang YUAN Ye ZHANG Weike YUAN Naichang Facility Design and Instrumentation Institute China Aerodynamics Research and Development CenterMianyang 621000China State Key Laboratory of Complex Electromagnetic Environment Effects on electronics and Information system National University of Defense TechnologyChangsha 410073China

This paper develops a deep estimator framework of deep convolution networks(DCNs)for super-resolution direction of arrival(DOA)*** addition to the scenario of correlated signals,the quantization errors of the DCN are the major *** our deep estimator framework,one DCN is used for spectrum estimation with quantization errors,and the remaining two DCNs are used to estimate quantization *** propose training our estimator using the spatial sampled covariance matrix directly as our deep estimator’s input without any feature extraction ***,we reconstruct the original spatial spectrum from the spectrum estimate and quantization errors ***,the feasibility of the proposed deep estimator is analyzed in detail in this *** the deep estimator is appropriately trained,it can recover the correlated signals’spatial spectrum fast and *** results show that our estimator performs well in both resolution and estimation error compared with the state-of-the-art algorithms.

关键词： off-grid direction of arrival(DOA)estimation deep convolution network(DCN) correlated signal quantization error super-resolution

Adaptive Relaying Protocol for Decode and Forward Full-Duplex system over Rician Fading Channel: system Performance Analysis

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第3期16卷 92-102页

作者： Tan N.Nguyen Minh Tran Thanh-Long Nguyen Miroslav Voznak wireless Communications research Group Faculty of Electrical and Electronics Engineering Ton Duc Thang University Optoelectronics research Group Faculty of Electrical and Electronics Engineering Ton Duc Thang University center for Information Technology Ho Chi Minh City University of Food Industry Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava

In this paper, the system performance of a decode-and-forward(DF) full-duplex(FD) adaptive relaying network over the Rician fading environment is proposed, analyzed and demonstrated. In the first stage, the system is presented with the energy harvesting and information transmission processes. After that, the analytical expressions of the achievable throughput, the outage probability, and symbol error ratio(SER) were proposed, analyzed and demonstrated. Finally, the analytical results are also demonstrated by Monte-Carlo simulation in comparison with the closed-form expressions in the influence of the key system parameters. The results show that the analytical and simulated results match for all possible parameter values.

关键词： relaying network throughput outage probability SER wireless energy harvesting(EH)

Intelligent indoor metasurface robotics

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第8期10卷 20-32页

作者： Hanting Zhao Shengguo Hu Hongrui Zhang Zhuo Wang Hao Dong Philipp del Hougne Tie Jun Cui Lianlin Li State Key Laboratory of Advanced Optical Communication systems and Networks School of Electronics Peking University center on Frontiers of Computing Studies School of Computer Science Peking University The French National Centre for Scientific research(CNRS) University of Rennes 4. State Key Laboratory of Millimeter WavesSoutheast University

Intelligent indoor robotics is expected to rapidly gain importance in crucial areas of our modern society such as at-home health care and factories. Yet, existing mobile robots are limited in their ability to perceive and respond to dynamically evolving complex indoor environments because of their inherently limited sensing and computing resources that are, moreover, traded off against their cruise time and payload. To address these formidable challenges, here we propose intelligent indoor metasurface robotics(I2MR),where all sensing and computing are relegated to a centralized robotic brain endowed with microwave perception; and I2MR’s limbs(motorized vehicles, airborne drones, etc.) merely execute the wirelessly received instructions from the brain. The key aspect of our concept is the centralized use of a computation-enabled programmable metasurface that can flexibly mold microwave propagation in the indoor wireless environment, including a sensing and localization modality based on configurational diversity and a communication modality to establish a preferential high-capacity wireless link between the I2MR’s brain and limbs. The metasurface-enhanced microwave perception is capable of realizing low-latency and high-resolution three-dimensional imaging of humans, even around corners and behind thick concrete walls, which is the basis for action decisions of the I2MR’s brain. I2MR is thus endowed with real-time and full-context awareness of its operating indoor environment. We implement, experimentally, a proof-of-principle demonstration at ～2.4 GHz, in which I2MR provides health-care assistance to a human inhabitant. The presented strategy opens a new avenue for the conception of smart and wirelessly networked indoor robotics.

关键词： intelligent metasurfaces intelligent robotics edge devices IoT 6G

An Efficient Scheduling Scheme for Fronthaul Load Reduction in Fog Radio Access Networks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communications 2019年第11期16卷 146-153页

作者： Sovit Bhandari Hong Ping Zhao Hoon Kim IoT and Big-data research center Department of Electronics Engineering Incheon National University

Fog radio access network(F-RAN) is one of the key technology that brings cloud computing benefit to the future of wireless communications for handling massive access and high volume of data traffic. The high fronthaul burden of a typical cellular system can be partially diminished by utilizing the storage and signal processing capabilities of the F-RANs, which is still not desirable as user throughput requirement is in the increasing trend with the increment of the internet of things(IoT) devices. This paper proposes an efficient scheduling scheme that minimizes the fronthaul load of F-RAN system optimally to improve user experience, and minimize latency. The scheduling scheme is modeled in a way that the scheduler which provides the lower fronthaul load while fulfilling the minimum user throughput requirement is selected for the data transmission process. Simulation results in terms of user selection fairness, outage probability, and fronthaul load for a different portion of user equipments(UEs) contents in fog access point(F-AP) are shown and compared with the most common scheduling scheme such as round robin(RR) scheme to validate the proposed method.

关键词： fog radio access networks fog access points fronthaul load user throughput

Optimal RS Location And Bandwidth Allocation For Relay system With Decode-Amplify-Forward Scheme

在线全文

学校读者我要写书评

暂无评论

Optimal RS Location And Bandwidth Allocation For Relay Syste...

A Novel Combinatorics-Based Reconfigurable Bit Permutation Network and Its Circuit Implementation

2009 3rd IEEE International Symposium on Microwave,Antenna,Propagation and EMC Technologies for wireless Communications

作者： Young il Kim wireless system research Group electronics and Telecoms research Institute Daejeon Korea

In this paper, the optimal relay station （RS） location and the bandwidth allocation for RS in fixed RS based radio cooperation system are investigated to maximize the data rate when the RS adopts decode- amplify-forward （DAF） scheme. According to the information-theoretic achievable rate maximization policy, the MS selectively accesses base station （BS） or RS, and the optimal RS location is obtained to maximize the system capacity for relaying system with three sectors within which there is one fixed RS. And then the optimal bandwidth allocation for the RS is gotten by calculating the percentage of MS which accesses RS. Numerical simulation is implemented to find the optimal RS location and bandwidth allocation for RS in IEEE 802.16j based relay system.

关键词： relay decode-amplify-forward bandwidth allocation IEEE 802.16j

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of electronics 2015年第3期24卷 513-517页

作者： SHAN Weiwei CHEN Xin LU Yinchao LI Jie National ASIC system Engineering research center Southeast University College of Electronic & Information Engineering Nanjing University of Aeronautics & Astronautics

Bit permutation is an important operation in many applications. A novel reconfigurable N × N bit permutation network with a compact structure is presented. It is based on combinatorics theory by cascading two recursive N/2 × N/2 sub-networks, while each subnetwork is cascaded by two N/4 × N/4 sub-networks, and so on cascaded until reaching the elementary 4 × 4 seed networks. Its routing algorithm is also established to determine each multiplexor’s status. Then the circuits of different sized permutation networks in a reconfigurable cipher co-processor were designed and implemented in 0.18μm CMOS process. The proposed circuit can achieve an arbitrary n × n permutation and support all types of bit permutations in many cryptographic algorithms. Plus, it consumes less multiplexors than commonly used BENES and OMFLIP networks.

关键词： Bit permutation Reconfigurable Cryptographic circuit Digital integrated circuits

Transmit correlation effect on SIC-ZF receiver for V-BLAST system

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China(Series F) 2009年第12期52卷 2290-2295页

作者： GUO HaiYou ZHOU ZhiGang HU HongLin Key Laboratory of wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Shanghai research center for wireless Communications Shanghai 200335 China

It has been shown that transmit correlation causes a signal-to-noise ratio （SNR） loss in the zero forcing （ZF） receiver for V-BLAST （Vertical Bell LAbs LAyered Space-Time） system. In this paper, we investigate the transmit correlation effect on the ZF receiver with successive interference cancellation （SIC）. We show that such an unfavorable condition leads to twofold effects on the performance degradation. In addition to the immediate SNR loss, the transmit correlation can increase the propagation factor to spread decision error significantly. These two effects are evaluated analytically. We derive the probability density function （pdf） of the effective SNR at each decoded stream, and hence accurately quantify the SNR loss. We also calculate the decision error propagation factor in terms of its second moment. In particular, we show that transmit correlation can cause a stable component of error propagation which does not decline during the SIC procedure. Finally, we conduct the simulation to verify the analytical results.

关键词： error propagation (EP) successive interference cancellation (SIC) transmit correlation V-BLAST zero forcing (ZF)