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检索条件"机构=Key Laboratory of Data Link Technology"

共 87 条记录，以下是61-70 订阅

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NB-IoT Estrus Detection System of Dairy Cows Based on LSTM Networks

NB-IoT Estrus Detection System of Dairy Cows Based on LSTM N...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Nan Ma Lin Pan Shihao Chen Baoling Liu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China CETC Key Laboratory of Data Link Technology Xi’an China

ISBN: (数字)9781728144900

ISBN: (纸本)9781728144917

To improve the revenue of dairy farms, cow estrus must be accurately monitored to track mating time. Narrow Band Internet of Things (NB-IoT) is considered as a promising technology to realize cost-effective detection system attributing to its wide coverage and low power consumption. To increase the success rate of real-time detection, machine learning based algorithms have been applied to extract patterns from estrus data. However, due to the lack of multivariate time series data, most previous studies do not consider using the time correlation to guide estrus detection. In this paper, we present a NB-IoT based solution framework where multivariate behavioral time series data collected by neck-mounted sensors and then uploaded to a cloud data center for further analysis through NB-IoT network. Based on the collected data, we propose an estrus prediction algorithm which gives estrus alert by exploiting Long-Short Term Memory (LSTM) and Convolution Neural Network (CNN). Through numerical studies conducted using real data set from the pasture, we show that our proposed solution outperforms exiting detection algorithms in terms of accuracy and efficiency.

关键词： Cows Logic gates Monitoring Temperature sensors Indexes Machine learning algorithms

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A Novel Non-Stationary Cylinder Model for Massive MIMO Air-To-Ground (A2G) Channels

A Novel Non-Stationary Cylinder Model for Massive MIMO Air-T...

引用

International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Shihao Chen Nan Ma Jianqiao Chen Xiaoli Yang Baoling Liu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China CETC Key Laboratory of Data Link Technology Xi’an China

ISBN: (数字)9781728172361

ISBN: (纸本)9781728172378

In this paper, we propose a novel single-hop cylinder-based channel model for massive multiple-input multiple-output (MIMO) air-to-ground (A2G) communication systems. With employing a uniform planar array (UPA) at the ground station (GS), we first characterize the geometrical relationships between transmitter and receiver through vectors in detail. Then, to describe the spatial non-stationary properties of clusters along the UPA, we propose a novel scatterer update process, which keeps the number of visible scatterers of different antenna elements constant. It also solves the high spatial-correlation problem, which results from the survival probability of the scatterer not tending to zero with the increase of distance. Moreover, we discuss the impacts of the spatial non-stationary properties on channel statistical characteristics, i.e., the spatial correlation function. Finally, our numerical and simulation results show that compared with other models, our proposed channel model can capture the spatial non-stationary properties of massive MIMO A2G channels observed in channel measurements well.

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A Novel 3D Non-stationary Channel Model with UPA for Massive MIMO V2V Communication in Crossroads Scattering Environments

A Novel 3D Non-stationary Channel Model with UPA for Massive...

引用

IEEE International Conference on Communications in China (ICCC)

作者： Fan Liu Nan Ma Jianqiao Chen Lulu Gu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China CETC Key Laboratory of Data Link Technology Xi'an China

ISBN: (数字)9781728173276

ISBN: (纸本)9781728173283

In this paper, we propose a novel three-dimensional (3D) non-stationary geometry-based channel model with a uniform planar antenna array (UPA) for massive multiple-input multiple-output (MIMO) vehicle-to-vehicle (V2V) communication in crossroads scattering environments. Considering the nearfield effect, we first calculate the received phases and Doppler frequency variations caused by movements under the spherical wavefront assumption. In this case, we adopt a two-ring and four-quarter-cylinder model to characterize the moving vehicles and static scatterers on the building, respectively. Then, we derive the closed-form expressions of channel impulse responses (CIRs) of the proposed model and discuss statistical properties in detail, e.g., temporal auto-correlation function (ACF) and spatial crosscorrelation function (CCF). Furthermore, the impacts of the movements, distribution of scatterers and setting of UPA on channel statistical properties are studied. Finally, our numerical and simulation results show that our proposed model with limited scatterers can capture the characteristics of massive MIMO V2V communication in crossroads scattering environments while agreeing well with the theoretical model, thereby demonstrating the efficiency of our model.

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A Novel 3D Wideband Geometry-Based Channel Model for 5G Massive MIMO Vehicle-to-Vehicle Communications in Urban Merging Areas

A Novel 3D Wideband Geometry-Based Channel Model for 5G Mass...

引用

IEEE International Conference on Communications Workshops, ICC

作者： Lulu Gu Nan Ma Jianqiao Chen Lingfeng Wang Baoling Liu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China CETC Key Laboratory of Data Link Technology Xi'an China

ISBN: (数字)9781728174402

ISBN: (纸本)9781728174419

In this paper, a novel three-dimensional (3D) wideband geometry-based stochastic model (GBSM) is developed for the fifth-Generation (5G) massive multiple-input multiple-output (MIMO) vehicle-to-vehicle (V2V) channels in urban merging areas. Our proposed model consists of a semi-circle and multi-confocal semi-ellipsoids, which is the first GBSM that is capable of modeling the blocking effect of the sound barrier equipped in the merging area. Under the spherical wavefront assumption, we first derive the channel impulse responses (CIRs) of the proposed model in detail. Then we further generate the corresponding simulation model by using a ray selection algorithm with considering the influence of the sound barrier. Moreover, the impacts of the height of the sound barrier and the velocity of the vehicle on the statistical characteristics of the proposed model are discussed. Finally, our numerical and simulation results indicate that our proposed model can capture characteristics of massive MIMO V2V channels in a merging area, thereby demonstrating the efficiency of our proposed model.

关键词： Merging Channel models MIMO communication Numerical models Roads Computational modeling Wideband

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Flexible Sectorized MPAC Configuration for 5G OTA Testing

Flexible Sectorized MPAC Configuration for 5G OTA Testing

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International Conference on Communication technology (ICCT)

作者： Fei Yu Nan Ma Xiaoli Yang Jianqiao Chen Beijing University of Posts and Telecommunications Beijing China CETC Key Laboratory of Data Link Technology Xi’an China

ISBN: (数字)9781728181417

ISBN: (纸本)9781728181424

This paper addresses the problem of multi-probe anechoic chamber (MPAC) configuration for over-the-air (OTA) radiated testing in fifth-generation (5G) multi-input multi-output (MIMO) communication systems. In this case, to construct a larger test area and reproduce the target channel model more accurately, the number of channel emulators and probes used in the test system is increasing, which results in a significant increase in the cost of the test system. To solve this problem, we first propose a novel two-dimensional (2D) sectorized MPAC configuration with uniform spacing of probes for accurately synthesizing clustered delay line (CDL) channel models. Then, we introduce an intelligent cuckoo search (CS) algorithm to optimize the selection of probe positions, which can significantly enhance the efficiency and accuracy of probe selection procedure. Specifically, the optimal OTA probe locations are determined within the sector width in 2D sectorized MPAC setups we proposed. Finally, numerical results show that our proposed flexible sectorized MPAC configuration with CS algorithm can emulate channels more accurately with fewer probes.

关键词： Probes Two dimensional displays Channel models Correlation Optimization Emulation 5G mobile communication

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Three-way decision of target threat decision making based on adaptive threshold algorithms

Three-way decision of target threat decision making based on...

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3rd Asian Conference on Artificial Intelligence technology, ACAIT 2019

作者： Li, Bo Tian, Linyu Han, Yue Chen, Daqing School of Electronics and Information Northwestern Polytechnical University Shanxi Xi'an China Cetc Key Laboratory of Data Link Technology Shanxi Xi'an China School of Engineering London South Bank University London United Kingdom

In order to solve the problems of existing threat assessment algorithms, a threat assessment method based on intuitionistic fuzzy three-way decision method is proposed. Firstly, the indexes are described by theory of intuitionistic fuzzy sets on the basis of that the threat assessment index system is established. Then, TOPSIS method is used to calculate the target threat. Finally, the targets are classified by three-way decision method according to the result of target threat. It is proved that it is feasible to introduce three-way decision method into threat assessment. At the same time, an improved algorithm for calculating the threshold of three-way decision is proposed. Experiments show that the improved algorithm has stable results and good classification effect. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Decision making

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Effectiveness analysis of ship formation air defence based on deep belief network

Effectiveness analysis of ship formation air defence based o...

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3rd Asian Conference on Artificial Intelligence technology, ACAIT 2019

作者： Li, Bo Luo, Haoran Wang, Yuanxun Chen, Daqing School of Electronics and Information Northwestern Polytechnical University Shanxi Xi'an China Cetc Key Laboratory of Data Link Technology Shanxi Xi'an China School of Engineering London South Bank University London United Kingdom

Aiming at the problem of strong subjectivity and insufficient data utilisation in the traditional ship formation combat effectiveness analysis method, this study proposes a performance analysis fitting model based on deep belief network (DBN), which effectively reconstructs the combat model and improves the accuracy of the effectiveness analysis of the combat system. Firstly, the ship formation air defence effectiveness analysis index system is constructed, and then the structure and training method of the performance analysis fitting model are introduced. Finally, based on the formation of air defence combat, the performance analysis fitting model based on DBN and its comparative experiments are simulated and analysed. Simulation results verify the applicability and effectiveness of the model and method. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Ships

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Modeling and Interoperability Testing of data link Based on DEVS

Modeling and Interoperability Testing of Data Link Based on ...

引用

IEEE International Conference on Electronic Information and Communication technology (ICEICT)

作者： Wanyong Tian Chilian Chen Lulu Zhao Key Laboratory of Technology on Data link China Electronics Technology Group Corporation (CETC) 20th Institute Xi'an China

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

As a key information technique, data link plays an important role in modern information-based warfare. Compared to traditional communication systems, data link has better interoperability and hence could promote the cooperation of all combat units. Interoperability is based on exchanging and utilizing data with the purpose of realizing tactical functions. Modeling and interoperability testing of data link have always been a great challenge. Taking protocol rules and tactical functions as testing objects, data link models are expressed in Discrete Event System (DEVS) Specification in this paper. Simulations show that the proposed methodology could perform typical rule and function test. Besides, it provides good effectiveness and scalability.

关键词： Protocols Semantics Tools data models Interoperability Standards Testing

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Multiple Basic Proposal Distributions Model Based Sampling Particle Filter

Multiple Basic Proposal Distributions Model Based Sampling P...

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International Conference on Information Fusion

作者： Lihong Shi Feng Yang Litao Zheng Xiaoxu Wang Liang Chen School of Automation Northwestern Polytechnical University Xi'an China CETC Key Laboratory of Data Link Technology Xi'an China

ISBN: (数字)9780578647098

ISBN: (纸本)9781728168302

A hybrid sampling strategy is considered in multimode sampling based particle filter to alleviate the degeneracy as one of the most typical problems in the particle filter. However, to achieve high accuracy, expensive computation cost is inevitable when generating the hybrid distribution. To overcome this problem, a novel framework of particle filter is proposed in this paper with an improved hybrid sampling strategy. The main novelty is that this framework can simplify the generation of the hybrid distribution and makes the selection of particles more reasonable, in which the likelihood of particle is used to select the particles and determine the weights of multiple basic proposal distributions. Two simulation examples are implemented to test performances of the proposed filter algorithm. The obtained results show that the proposed framework has several superior performances in comparison with the standard particle filter, the unscented particle filter and the multimode sampling based particle filter.

关键词： Proposals Probability density function Estimation Automation Monte Carlo methods Hybrid power systems Atmospheric measurements

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Frequent Pattern Mining Based On Occupation and Correlation

Frequent Pattern Mining Based On Occupation and Correlation

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IEEE International Conference on Electronic Information and Communication technology (ICEICT)

作者： Kai Zhang Yongping Zhang Zhigang Wang Key Laboratory of Technology on Data link China Electronics Technology Group Corporation (CETC) 20th Institute Xi'an China

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

Frequent itemset mining has been extensively studied in data mining for over the last two decade because of its numerous applications. However, the classic support-based mining framework used by most previous studies is not suitable for some real-world application, such as the travel landscapes recommendation, where occupancy besides support also plays a key role in evaluating the interestingness of an itemset. In this paper, we propose a new kind of tasks based on occupancy, namely high correlated occupancy mining, by introducing correlated occupancy into the support-based mining framework. We present the confidence constraint to filter redundant information and show the mining goal of top-k quality pattern combined with occupancy and correlation pattern mining algorithm to ensure the results credible.

关键词： Correlation Itemsets Filtering algorithms Information filters Information and communication technology data mining Task analysis

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