检索结果-内蒙古大学图书馆

Simple and practical method of characterizing the parametric down-conversion source

Chinese Physics B 2017年第11期26卷 83-88页

作者：王东伍娟赵良圆安雪碧银振强陈巍韩正甫王琴 Key Laboratory of Quantum Information University of Science and Technology of China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications

Parametric down-conversion（PDC） sources play an important role in quantum information processing, therefore characterizing their properties is necessary. Here we present a statistical model to assess the properties of the PDC source with certain distribution, such as the brightness and photon channel transmissions, we only need to measure the singles and coincidences counts in a few seconds. Furthermore, we validate the model by applying it to a PDC source generating highly non-degenerate photon pairs. The results of the experiment indicate that our method is more simple, efficient, and less time consuming.

关键词： parametric down-conversion brightness photon channel transmission

来源：评论

学校读者我要写书评

暂无评论

Ionosphere correction algorithm for spaceborne SAR imaging

引用

Journal of Systems Engineering and Electronics 2016年第5期27卷 993-1000页

作者： Lin Yang Mengdao Xing Guangcai Sun School of Electronic Science and Engineering National University of Defense TechnologyChangsha 410073China National Laboratory of Radar Signal Processing Xidian UniversityXi'an 710071China

For spaceborne synthetic aperture radar （SAR） imaging,the dispersive ionosphere has significant effects on the propagationof the low frequency （especially P-band） radar signal. Theionospheric effects can be a significant source of the phase error inthe radar signal, which causes a degeneration of the image qualityin spaceborne SAR imaging system. The background ionosphericeffects on spaceborne SAR through modeling and simulation areanalyzed, and the qualitative and quantitative analysis based onthe spatio-temporal variability of the ionosphere is given. A novelionosphere correction algorithm （ICA） is proposed to deal with theionospheric effects on the low frequency spaceborne SAR radarsignal. With the proposed algorithm, the degradation of the imagequality caused by the ionosphere is corrected. The simulation resultsshow the effectiveness of the proposed algorithm.

关键词： synthetic aperture radar （SAR） radar imaging highresolution ionospheric effects total electron content （TEC）.

来源：评论

学校读者我要写书评

暂无评论

Modulation recognition of underwater acoustic communication signals based on denoising & deep sparse autoencoder 45

Modulation recognition of underwater acoustic communication ...

引用

45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016

作者： Yang, Honghui Yao, Xiaohui Shen, Sheng Xiong, Jinyu Zhang, Xiaoyong School of Marine Science and Technology Northwestern Polytechnical University China Science and Technology on Blind Signals Processing Laboratory China

It is difficult to identify the modulation types of underwater acoustic communication signals via traditional modulation recognition methods since the received communication signals always have a low signal to noise ratio (SNR) due to the oceanic ambient noise and signal distortion. In this paper, we propose a modulation recognition model for underwater acoustic communication signals which is combined by a denoising autoencoder and a deep sparse autoencoder. We use a denoising autoencoder to reconstruct the signals as a preprocessing in order to enhance the signals and then we use the reconstructed signals as training datasets to train a deep sparse autoencoder to classify 4 kinds of modulation types of underwater acoustic communication signals. Denoising autoencoder can learn essential representations of input that are robust to stochastic corruption in input, besides, sparse coding can make the representations learning more efficient. Comparative experiments clearly show the advantage of using denoising autoencoder and deep sparse autoencoder in modulation recognition of underwater acoustic communication signals. © 2016, German Acoustical Society (DEGA). All rights reserved.

关键词： Modulation

来源：评论

学校读者我要写书评

暂无评论

A signal Synchronization and Pilot-Aided DOA Estimation Method in the presence of Interferences 6

A Signal Synchronization and Pilot-Aided DOA Estimation Meth...

引用

6th IEEE International Conference on Computer and Communications, ICCC 2020

作者： Wei, Lanxin Wang, Siye Xu, Wenbo Li, Dong Yang, Kun Network and Wireless Communication Lab Beijing University of Posts and Telecommunications Beijing China National Key Laboratory of Science and Technology on Blind Signal Processing Shanghai China

ISBN: (纸本)9781728186351

Direction of arrival (DOA) estimation is a fundamental problem in signal processing. The super-resolution spatial spectrum estimation algorithm based on feature decomposition, such as multiple signal classification (MUSIC) and estimating signal parameter via rotational invariance techniques (ESPRIT), has a good performance in high signal-to-interference plus noise ratio (SINR) environment and single interference. However, strong interferences will make DOA estimation error. And the number of angles that can be estimated by these methods is limited by the freedom of the antenna. The existence of multiple interferences will affect accuracy of DOA estimation. To address this problem, in this paper, we propose a novel dual-channel synchronization architecture and a Piloted-Aided DOA estimation method. We improve the matching performance by dual channel synchronization. A new matched filter is designed by using the idea of filter truncation, which reduces the computational resource cost. And a new DOA estimation method is proposed, which can estimate the angle of target signal in the environment of low SINR and multiple interferences. Experiments were performed to verify the performance of the proposed design. Results show that this architecture can greatly reduce the computational complexity. And the method successfully gets the direction of target signal in low SINR environment. © 2020 IEEE.

关键词： Synchronization

来源：评论

学校读者我要写书评

暂无评论

Terahertz radiation affects the dynamics of neurons by decreasing membrane area ratio

引用

Brain Research Bulletin 2025年 227卷 111373-111373页

作者： Ma, Shaoqing Li, Siyu Wang, Huan Li, Yingwei Lu, Chengbiao Li, Xiaoli School of Management Science and Information Engineering Hebei University of Economics and Business Shijiazhuang 050062 China School of Information Science and Engineering Yanshan University Qinhuangdao 066004 China Hebei Key Laboratory of Information Transmission and Signal Processing Qinhuangdao 066004 China School of Electronic and Information Engineering Hebei University of Technology Tianjin 300401 China School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China Henan International Key Laboratory for noninvasive Neuromodulation Xinxiang Medical University Xinxiang 453003 China School of Automation Science and Engineering South China University of Technology Guangzhou 510641 China Pazhou Lab Guangzhou 510330 China

Terahertz radiation at specific frequencies and energies can mediate cellular morphology or function changes by exciting nonlinear resonance effects in proteins or DNA. However, the effects of terahertz radiation on neuronal morphology and function are currently unknown, and the correlation between neuronal morphology and kinetic properties after terahertz radiation remains to be elucidated. In this paper, we first characterized the changes in neuronal morphology by the relative ratio of neuronal cytosol to protruding membrane area. Analyzed the pattern of the influence of terahertz radiation on neuronal morphology and the cumulative effect. On this basis, this paper constructs a kinetic model of neurons regulated by terahertz radiation, investigates the influence law of terahertz radiation on the kinetic properties of neurons, and analyzes the correlation between neuronal morphology and kinetic properties. The results showed that terahertz radiation caused a decrease in the membrane area ratio of neuronal cytosol to protrusion, and this effect started on the first day of terahertz radiation and lasted until the end of terahertz radiation;terahertz radiation changed the neuronal discharge pattern by decreasing the membrane area ratio of neuronal cytosol to protrusion and lowered the frequency of neuronal inter-cluster discharges and amplitude of action potentials, and increased the neuronal intra-cluster discharge. In addition, terahertz radiation can increase the peak value of neuronal postsynaptic currents by decreasing the membrane area ratio. In summary, terahertz radiation can modulate neurons' morphology and change their firing patterns and kinetic properties by affecting their morphology. These predict that terahertz radiation at specific frequencies and energies can be developed as a novel, molecular-level neuromodulation technique for intervening or treating neuronal degenerative diseases. © 2025 The Authors

关键词： Neuronal Dynamics Neuronal Morphology Neurons Synaptic Transmission Terahertz Radiation

来源：评论

学校读者我要写书评

暂无评论

Dynamics of a Cortical Neural Network Based on a Simple Model

引用

Chinese Physics Letters 2012年第8期29卷 52-55页

作者： QU Jing-Yi WANG Ru-Bin Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation UniversityTianjin 300300 Institute for Cognitive Neurodynamics School of ScienceEast China University of Science and TechnologyShanghai 200237

The collective dynamics of a randomly connected neuronal network motivated by the anatomy of a mammalian cortex based on a simple model are *** simple model can not only reproduce the rich behaviors of biological neurons but also has only two equations and one nonlinear *** varying some key parameters,such as the connection weights of neurons,the external current injection and the noise of intensity,this neuronal network will exhibit various collective *** is demonstrated that the synchronization status of the neuronal network has a strong relationship with the key parameters and the external current has more influence on the spiking of inhibitory neurons than that of excitatory *** results may be instructive in understanding the collective dynamics of a mammalian cortex.

关键词： anatomy collective cortex

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

Overlapping community‐based particle swarm optimization algorithm for influence maximization in social networks

引用

CAAI Transactions on Intelligence technology 2023年第3期8卷 893-913页

作者： Lei Zhang Yutong Liu Haipeng Yang Fan Cheng Qi Liu Xingyi Zhang Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Intelligent Computing and Signal Processing of Ministry of EducationSchool of Computer Science and TechnologyAnhui UniversityHefeiChina School of Computer Science and Technology University of Science and Technology of ChinaHefeiChina

Influence maximization,whose aim is to maximise the expected number of influenced nodes by selecting a seed set of k influential nodes from a social network,has many applications such as goods advertising and rumour *** the existing influence maximization methods,the community‐based ones can achieve a good balance between effectiveness and ***,this kind of algorithm usually utilise the network community structures by viewing each node as a non‐overlapping *** fact,many nodes in social networks are overlapping ones,which play more important role in influence *** this end,an overlapping community‐based particle swarm opti-mization algorithm named OCPSO for influence maximization in social networks,which can make full use of overlapping nodes,non‐overlapping nodes,and their interactive information is ***,an overlapping community detection algorithm is used to obtain the information of overlapping community structures,based on which three novel evolutionary strategies,such as initialisation,mutation,and local search are designed in OCPSO for better finding influential *** results in terms of influence spread and running time on nine real‐world social networks demonstrate that the proposed OCPSO is competitive and promising comparing to several state‐of‐the‐arts(***,CMA‐IM,CIM,CDH‐SHRINK,CNCG,and CFIN).

关键词： computational intelligence data mining social network

来源：评论

学校读者我要写书评

暂无评论

Efficient closed-form estimator for moving source localization using TDOA-FDOA-AOA measurements 17

Efficient closed-form estimator for moving source localizati...

引用

6th WASE International Conference on Information Engineering, ICIE 2017

作者： Deng, Bing Sun, Zheng Bo He, Qin Zhengzhou Institute of Information Science and Technology P.O. Box 450001 China National Key Laboratory of Science and Technology on Blind Signal Processing P.O. Box 610041 China

ISBN: (纸本)9781450352109

This paper1 proposes a simple and efficient closed-form solution for a moving source localization using the time difference of arrival (TDOA), frequency difference of arrival (FDOA) and angle of arrival (AOA) measurements obtained at spatially distributed moving receivers. Comparing with the localization scenario utilizing TDOA and AOA measurements only, this hybrid localization scheme by adding FDOA measurements can improve source position estimate accuracy and gain source velocity information in the same time. Theoretical analysis and simulations verify the approximate efficiency of the developed positioning technique and its improved performance over the benchmark iterative method. © 2017 Copyright held by the owner/author(s).

关键词： Time difference of arrival

来源：评论

学校读者我要写书评

暂无评论

A comparative study on the accuracy of two methods for time delay estimation 17

A comparative study on the accuracy of two methods for time ...

引用

6th WASE International Conference on Information Engineering, ICIE 2017

作者： Zhao, Pei Yan Qin, Ji Dong Peng, Hua Feng National Key Laboratory of Science and Technology on Blind Signal Processing P.O. Box 610041 China Zhengzhou Institute of Information Science and Technology P.O. Box 450001 China

ISBN: (纸本)9781450352109

This paper1 presents an accuracy analysis of Time Delay Estimation (TDE) in the passive location system. Firstly, the signal processing model using the information of envelope and phase are presented, respectively. Then the Cramer-Rao Lower Bounds (CRLB) for phase delay estimation is developed. The bound is shown to be inversely proportional to carrier wavelength, and for narrowband signals, independent of the signals bandwidth. Simulation results show that the theoretical analysis is correct, and the use of phase information alone or in combination with the envelope information is expected to significantly improve the accuracy of time delay estimation. © 2017 Copyright held by the owner/author(s).

关键词： Timing circuits

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：