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检索条件"作者=Liang xuwen"
206 条 记 录,以下是1-10 订阅
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Unlicensed Spectrum Sharing Game Between LEO Satellites and Terrestrial Cognitive Radio Networks
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Chinese Journal of Aeronautics 2012年 第4期25卷 605-614页
作者: XIE Zhuochen MA LU liang xuwen Shanghai Engineering Center for Micro-satellites Shanghai 200050China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Graduate University of Chinese Academy of Sciences Beijing 100049China
By cognitive radio,the low Earth orbit(LEO) satellites may prefer to operate in the unlicensed spectrum which is open to all the users,and compete for the limited resources with terrestrial cognitive radio networks... 详细信息
来源: 评论
Orbital reference frame estimation with power spectral density constraints for drag-free satellites
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Chinese Journal of Aeronautics 2016年 第6期29卷 1721-1729页
作者: Zhang Yonghe Wang Yamin Mao Qingyun liang xuwen Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Shanghai Engineering Centre for Microsatellites Shanghai 201210China Joint Key Laboratory of Microsatellite Chinese Academy of SciencesShanghai 201210China
The drag-free satellites are widely used in the field of fundamental science as they enable the high-precision measurement in pure gravity fields. This paper investigates the estimation of local orbital reference fram... 详细信息
来源: 评论
A distributed routing algorithm based-on simplified topology in LEO satellite networks
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High Technology Letters 2010年 第2期16卷 117-123页
作者: 曾媛 liang xuwen Li Yong Shanghai Engineering Center for Micro-Satellites Shanghai 200050 P.R. China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 P.R. China
In this paper, a distributed muting strategy based on simplified topology (DRBST) was proposed for LEO satellite networks. The topology of LEO satellite networks was simplified aiming at minimizing intersatellite li... 详细信息
来源: 评论
Dynamic Channel Reservation Strategy Based on DQN Algorithm for Multi-Service LEO Satellite Communication System
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IEEE WIRELESS COMMUNICATIONS LETTERS 2021年 第4期10卷 770-774页
作者: Li, Zongwang Xie, Zhuochen liang, xuwen Chinese Acad Sci Shanghai Engn Ctr Microsatellites Shanghai 201210 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China
In this letter, a dynamic channel reservation (DCR) strategy based on deep Q network (DQN) is proposed for multi-service low earth orbit (LEO) satellite communication system. We develop a novel modeling method to repr... 详细信息
来源: 评论
Blind Identification Based on Expectation-Maximization Algorithm Coupled With Blocked Rhee-Glynn Smoothing Estimator
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IEEE COMMUNICATIONS LETTERS 2018年 第9期22卷 1838-1841页
作者: Chen, Wenhao Ma, Lu liang, xuwen Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol Shanghai 200050 Peoples R China Chinese Acad Sci Shanghai Engn Ctr Microsatellites Shanghai 201210 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Shanghai SpaceOK Aerosp Technol Co Ltd Shanghai 201802 Peoples R China
In this letter, we consider blind estimation of channel parameters over a frequency-selective channel. We use a blocked Rhee-Glynn smoothing estimator to derive E-step in the expectation-maximization (EM) algorithm. T... 详细信息
来源: 评论
Symmetry Chirp Spread Spectrum Modulation Used in LEO Satellite Internet of Things
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IEEE COMMUNICATIONS LETTERS 2018年 第11期22卷 2230-2233页
作者: Qian, Yubi Ma, Lu liang, xuwen Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol Shanghai 100049 Peoples R China Chinese Acad Sci Shanghai Engn Ctr Microsatellites Shanghai 100049 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Shanghai SpaceOK Aerosp Technol Co Ltd Shanghai 201802 Peoples R China
With the development of Internet of Things (IoT), the world gradually moves toward the interconnection of all things. In terrestrial networks, narrowband-IoT and Long Rage (LoRa) are used widely in the IoT industry. F... 详细信息
来源: 评论
The Acquisition Method of Symmetry Chirp Signal Used in LEO Satellite Internet of Things
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IEEE COMMUNICATIONS LETTERS 2019年 第9期23卷 1572-1575页
作者: Qian, Yubi Ma, Lu liang, xuwen Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol Shanghai 200050 Peoples R China Chinese Acad Sci Shanghai Engn Ctr Microsatellites Shanghai 201210 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Shanghai SpaceOK Aerosp Technol Co Ltd Shanghai 201802 Peoples R China
Chirp signal has been used in some fields, like radar and sonar. In recent years, the symmetry chirp signal (SCS) is a kind of revised Long Range (LoRa) chirp signal and proposed to be used in low-earth-orbit (LEO) sa... 详细信息
来源: 评论
Heterogeneous temporal graph powered DRL algorithm for channel allocation in Maritime IoT Systems
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COMPUTER COMMUNICATIONS 2024年 213卷 260-270页
作者: Li, Zongwang Xie, Zhuochen He, Xiaohe liang, xuwen Chinese Acad Sci Innovat Acad Microsatellites 1 Xueyang Rd Shanghai 201304 Peoples R China Univ Chinese Acad Sci 1 Yanqihu East Rd Beijing 101408 Peoples R China
In actual maritime Internet of Things systems, the communication environment is characterized by its time-varying nature and the presence of highly heterogeneous network structures. Those attributes present considerab... 详细信息
来源: 评论
Intelligent Spectrum Sharing Strategy for Integrated Satellite-Maritime Heterogeneous Mobile Networks
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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2024年 第5期73卷 6780-6794页
作者: Wu, Ruiwen Li, Zongwang Xie, Zhuochen liang, xuwen Univ Chinese Acad Sci Beijing 100049 Peoples R China Shanghai Innovat Acad Microsatellites Shanghai 201304 Peoples R China Shanghai Engn Ctr Microsatellites Shanghai 201210 Peoples R China
Spectrum sharing is a pivotal technology for integrated satellite-maritime network to improve spectrum efficiency. However, the majority of existing spectrum sharing approaches relied on time-frequency multiplexing to... 详细信息
来源: 评论
On-Orbit Estimation and Calibration of GPS Antenna Geometry Offsets for Attitude Determination of LEO Satellites
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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2018年 第3期E101A卷 644-648页
作者: Hou, Huiling Hu, Weisheng Wu, Kang liang, xuwen Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol Shanghai Peoples R China Chinese Acad Sci Shanghai Engn Ctr Microsatellites Shanghai Peoples R China Univ Chinese Acad Sci Beijing Peoples R China
In this letter, a novel on-orbit estimation and calibration method of GPS antenna geometry offsets for attitude determination of LEO satellites is proposed. Both baseline vectors in the NED coordinate system are achie... 详细信息
来源: 评论