检索结果-内蒙古大学图书馆

Suppression of Doppler dispersion in the target detection with multi-carrier signal

The Journal of China Universities of Posts and Telecommunications 2016年第2期23卷 1-5,30页

作者： Yang Chao Wang Mei Zheng Lin Tang Jianming Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin University of Electronic Technology Guilin 541004 China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang 050081 China

The output of each individual channel in multi-carrier system can be processed to detect moving targets by the approach used in tradition narrowband pulse Doppler（PD） radar and then using non-coherent integration to promote signal noise ratio（SNR）. However, due to the difference of Doppler on sub-carriers, there occurs Doppler dispersion during non-coherent integration, which causes attenuation and extension on target＇s amplitude. Especially, it can deteriorate performance of target detection under wideband multicarrier system or fast-moving target scene. In this paper, a modified Fourier transform kernel is proposed to solve Doppler dispersion for multi-carrier chirp signal. It can achieve accumulation at the same frequency point for the target＇s Doppler of each subcarrier. The simulation results indicate that this method can effectively eliminate the integral loss caused by Doppler dispersion.

关键词： multi-carrier chirp Doppler dispersion pulse Doppler(PD) Doppler frequency shift(DFS)

来源：评论

学校读者我要写书评

暂无评论

SPP-MIM Hybridization Meta-Films for High-Sensitivity and High-Stability Biosensing at Optical Fiber End-Facets

SSRN

引用

SSRN 2025年

作者： He, Chenjia Sun, Xiaqing Zhong, Hao Meng, Qing-Feng Zhou, Xuetong Liu, Sihang Zheng, Li Kong, Xiangyang Chen, Shengfu Yang, Tian State Key Laboratory of Advanced Optical Communication Systems and Networks Key Laboratory for Thin Film and Microfabrication The Ministry of Education School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Material Science and Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Key Laboratory of Biomass Chemical Engineering College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China

The specific optical dispersion of metal-insulator-metal (MIM) waveguide allows the hybridization of surface plasmon polaritons (SPPs) and the waveguide, which is not possible with dielectric waveguides. SPP-MIM hybridization creates such a meta-film that integrates the previously incompatible respective merits of SPR and LSPR, including a flat biosensing interface, a high surface sensitivity and efficient coupling with spatially confined illumination. On the other hand, to achieve stable and reproducible performance is one of the greatest but unresolved challenges for nanophotonic biosensors. Yet the underlying mechanism of instability is not well understood. We conclude, from a literature survey, that the stability of biosensing performance is strongly correlated with the flatness of the physical sensing interface. A nanostructured interface, at least, would introduce surface gas nanobubbles to interfere with the interactions between analytes in the solution and ligands on the solid substrate. Hence, the SPP-MIM meta-film provides a capable solution for sealing photonic nanostructures under a flat and stable biosensing interface. We embed the meta-film with a plasmonic crystal cavity and integrate it on a single-mode fiber's end-facet to detect biomolecular interactions. This device demonstrates highly reproducible sensorgrams and convincing detection of biotinylated proteins at down to 30 fM, with the sensorgrams following the Langmuir model. Having both high sensitivity and high stability, our device proposal provides an unprecedentedly comprehensive solution for optical fiber-tip plasmonic devices. It has immediate application values for biomolecular interaction analysis and drug discovery. © 2025, The Authors. All rights reserved.

关键词： MIM devices

来源：评论

学校读者我要写书评

暂无评论

Demonstration of 60 GHz millimeter-wave short-range wireless communication system at 3.5 Gbps over 5 m range

引用

science China(Information sciences) 2017年第8期60卷 70-76页

作者： Guangrong YUE Zhiqiang WANG Lei CHEN Long CHENG Junlin TANG Xianbing ZOU Yuan ZENG Lianming LI National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory 54th Research Institute of China Electronics Technology Group Corporation Shanghai Institute of Aerospace System Engineering School of Information Science and Engineering Southeast University

Millimeter-wave communication has received considerable attention for use in new-generation broadband wireless communication because of the scarcity of microwave band spectrum resources. The unlicensed frequency band at 60 GHz is suitable for indoor short-range broadband communication. In this paper, we introduce a 60 GHz millimeter-wave short-range wireless communication demo system adhering to the IEEE 802.11 ad standard and targeting high-definition video streaming transmission. The system uses single-carrier transmission with frequency-domain equalization. The hardware prototype consists of a 65-nm CMOS radio-frequency front-end and a baseband transceiver for the physical layer functions. Important baseband technologies such as carrier synchronization, phase noise compensation, frequency-domain equalization, and low-density parity-check decoding based on probability calculation are also discussed. The system performance is demonstrated in an experiment on high-definition video transmission, where a data rate of 3.52 Gbps is achieved with a quadrature phase-shift keying signal over a distance of 5.109 m.

关键词： 60 GHz millimeter-wave IEEE 802 11ad SC-FDE 65-nm CMOS

来源：评论

学校读者我要写书评

暂无评论

A secure and high-performance multi-controller architecture for software-defined networking

引用

Frontiers of Information technology & Electronic Engineering 2016年第7期17卷 634-646页

作者： Huan-zhao WANG Peng ZHANG Lei XIONG Xin LIU Cheng-chen HU Department of Computer Science and Technology Xi'an Jiaotong UniversityXi'an 710059China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang 050081China MOE Key Laboratory for Intelligent Networks and Network Security Xi'an Jiaotong UniversityXi'an 710049China

Controllers play a critical role in software-defined networking(SDN).However,existing singlecontroller SDN architectures are vulnerable to single-point failures,where a controller's capacity can be saturated by flooded flow *** addition,due to the complicated interactions between applications and controllers,the flow setup latency is relatively *** address the above security and performance issues of current SDN controllers,we propose distributed rule store(DRS),a new multi-controller architecture for *** DRS,the controller caches the flow rules calculated by applications,and distributes these rules to multiple controller *** controller instance holds only a subset of all rules,and periodically checks the consistency of flow rules with each *** from switches are distributed among multiple controllers,in order to mitigate controller capacity saturation *** the same time,when rules at one controller are maliciously modified,they can be detected and recovered in *** implement DRS based on Floodlight and evaluate it with extensive *** results show that DRS can effectively maintain a consistently distributed rule store,and at the same time can achieve a shorter flow setup time and a higher processing throughput,compared with ONOS and Floodlight.

关键词： Software-defined networking(SDN) Security Multi-controller Distributed rule store

来源：评论

学校读者我要写书评

暂无评论

Secure Beamforming Design for SWIPT in Cooperative D2D communications

引用

China communications 2017年第1期14卷 20-33页

作者： Li Jiang Cheng Qin Xixi Zhang Hui Tian State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunicationsand Science and Technology on Information Transmission and Dissemination in Communication Networks LaboratoryBeijing100876China

In device-to-device(D2D) communications, device terminal relaying makes it possible for devices in a network to function as transmission relays for each other to enhance the spectral efficiency. In this paper we consider a cooperative D2D communication system with simultaneous wireless information and power transfer(SWIPT). The cooperative D2D communication scheme allows two nearby devices to communicate with each other in the licensed cellular bandwidth by assigning D2D transmitters as half-duplex(HD) relay to assists cellular downlink transmissions. In particular, we focus on secure information transmission for the cellular users when the idle D2D users are the potential eavesdroppers. We aim to design secure beamforming schemes to maximize the D2D users data rate while guaranteeing the secrecy rate requirements of the cellular users and the minimum required amounts of power transferred to the idle D2D users. To solve this non-convex problem, a semi-definite programming relaxation(SDR) approach is adopted to obtain the optimal solution. Furthermore, we propose two suboptimal secure beamforming schemes with low computational complexity for providing secure communication and efficient energy transfer. Simulation results demonstrate the superiority of our proposed scheme.

关键词： device-to-device(D2D) communications half-duplex relaying physical layer security secure beamforming simultaneous wireless information and power transfer

来源：评论

学校读者我要写书评

暂无评论

Channel Sensing Order for Distributed Cognitive networks with Multi-user and Multi-channel 9

Channel Sensing Order for Distributed Cognitive Networks wit...

引用

2017 9th IEEE International Conference on communication Software and networks (ICCSN 2017)

作者： Liwang Li Tong Li Jincheng Ge Lijun Kong Jie Liu College of Communications Engineering PLA University of Science and Technology Science and Technology on Communication Networks Laboratory

ISBN: (纸本)9781509038237;9781509038220

This work investigates the problem of channel sensing order in distributed cognitive networks with multiuser, in which the set of active secondary users is randomly changing in each time slot. We model this problem into a noncooperative game and define a generalized interference metric. The optimization objective is to minimize the generalized interference metric. To cope with this problem, we propose Q learning algorithm and no-regret learning algorithm. Through simulations we evaluate our proposal and compare its throughput performance with random selection algorithm, the results obtained by Q learning algorithm are close to no-regret learning algorithm and superior to random selection algorithm.

关键词： channel sensing order distributed cognitive networks non-cooperative game Q learning

来源：评论

学校读者我要写书评

暂无评论

Database-based Dynamic Spectrum Sharing with Service Adaptation Using OMNeT++ Simulator 9

Database-based Dynamic Spectrum Sharing with Service Adaptat...

引用

2017 9th IEEE International Conference on communication Software and networks (ICCSN 2017)

作者： Tong Li Liwang Li Lijun Kong College of Communications Engineering PLA University of Science and Technology Science and Technology on Communication Networks Laboratory

ISBN: (纸本)9781509038237;9781509038220

In this paper, we consider a centralized dynamic spectrum sharing system, in which dynamic spectrum allocation is accomplished in spectrum database. We consider a more realistic scenario, in which different users can access the same channel simultaneously within limited *** to the users submitting the service requirements in a sequential manner, the current channel allocation result will influence the future users. In order to solve this challenge, we propose a soft decision policy based dynamic spectrum allocation algorithm. Simulations results using the OMNeT++simulator are provided, showing that the soft decision policy based dynamic spectrum allocation algorithm is better than the best respond algorithm in terms of satisfaction and packet loss rate.

关键词： spectrum database dynamic spectrum sharing service adaptation OMNeT++

来源：评论

学校读者我要写书评

暂无评论

Recent progress in an ‘ultra-high speed, ultra-large capacity, ultra-long distance' optical transmission system(Invited Paper)

引用

Chinese Optics Letters 2016年第12期14卷 7-11页

作者：余少华罗鸣李响胡荣邱英黎偲刘武贺志学曾涛杨奇 Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory of Optical Communication Technologies and Networks Wuhan Research Institute of Posts and Telecommunications

From 2010 to 2015, the Wuhan Institute of Posts and Telecommunications（WRI） had undertaken the national key basic research development program project ‘ultra-high speed, ultra-large capacity, ultra-long distance（3U）optical transmission based research＇ as the leading agency. Under the support of the project, we have obtained a series of achievements in scientific research and engineering. Some of the results have been widely used in commercial systems. This Review will make a preliminary summary of the achievements during the past 5 years.

关键词： preliminary agency Wuhan multiplexing coherent Invited Paper hundreds summary companies bandwidth

来源：评论

学校读者我要写书评

暂无评论

An Abnormal Traffic Detection Based on Attention-Guided Bidirectional GRU 22

An Abnormal Traffic Detection Based on Attention-Guided Bidi...

引用

22nd IEEE International Conference on communication technology, ICCT 2022

作者： Li, Hao He, Erlu Kuang, Chunxu Yang, Xiaopeng Wu, Xiangbo Jia, Zhe Science and Technology on Communication Networks Laboratory Shijiazhunag China

ISBN: (纸本)9781665470674

With the development of network technology and the diversification of network applications, network environment is becoming increasingly complex which leads to various network attacks. Malicious traffic, such as DDOS and infiltration attacks, may degrade the network quality, or even block the network directly. Now, traditional network security methods are difficult to meet the needs for network security and information security. Due to the high recognition accuracy and strong generalization of deep neural network (DNN), deep learning based abnormal traffic detection methods have become a research hotspot. However, there are obvious problems containing high false positive rate poor robustness. We propose a novel abnormal traffic detection method based on attention-guided bidirectional gated recurrent unit (Att-BiGRU). Different from the traditional feature extraction methods in DNNs, we use stacked sparse Auto-encoder (SSAE) to extract traffic features for interference factors filtering. The extracted features can reproduce the original input samples as much as possible which enhances the representation of traffic features and effectively improves the robustness of anomaly detection traffic. Then, attention mechanism was introduced to optimize the traffic features. Extensive experiments on UNSW-NB15 show that the proposed scheme has the impressive performance. Compared with recent abnormal traffic detection algorithms, the proposed scheme achieves better results with 89.67% accuracy and 4.2% FAR. © 2022 IEEE.

关键词： Network security

来源：评论

学校读者我要写书评

暂无评论

DNN7: An Efficient Network Intrusion Detection Model 22

DNN7: An Efficient Network Intrusion Detection Model

引用

22nd IEEE International Conference on communication technology, ICCT 2022

作者： Li, Hao Wu, Xiangbo Zhao, Yangyang Yang, Xiaopeng He, Erlu Jia, Zhe Science and Technology on Communication Networks Laboratory Shijiazhuang China

ISBN: (纸本)9781665470674

With the explosive growth of network traffic, network intrusion detection has become an increasingly important part of network security field. In view of the frequent emergence of new attack types, it is necessary to design an efficient network intrusion detection system (NIDS) model. However, an realistic problem for current NIDS is the balance between the accuracy and real-time performance in massive traffic data scenarios. In this paper, we propose an improved deep neural network model named DNN7, which contains 7 hidden layers to better capture data features. Furthermore, batch normalization layer is introduced to reduce the change of the hidden layer data distribution and improve the stability of the network. Experiments on UNSW-NBIS indicates that DNN7 has excellent performance. Compared with the DNN3 model, the accuracy is increased by 20%. It can save a lot of time compared to other complex models with deep layers. DNN7 has a simple structure and less overhead, and is more suitable for real-time analysis and detection of massive traffic in real scenarios. © 2022 IEEE.

关键词： Deep neural networks

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：