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检索条件"机构=Beijing Laboratory of Network System Architecture and Convergence"

共 1221 条记录，以下是301-310 订阅

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WiAgent: Link Selection for CSI-Based Activity Recognition in Densely Deployed Wi-Fi Environments

WiAgent: Link Selection for CSI-Based Activity Recognition i...

引用

IEEE Conference on Wireless Communications and networking

作者： Xinbin Shen Lingchao Guo Zhaoming Lu Xiangming Wen Shuang Zhou Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

In this work, we address the issue of Wi-Fi-based human activity recognition (HAR) system in densely deployed Wi-Fi environments. With the benefit of sufficient information provided by Wi-Fi channel state information (CSI), HAR based on Wi-Fi has become an active research area in recent years. Traditional Wi-Fi CSI-based HAR applications usually focus on utilizing one Wi-Fi transmitter and one or several Wi-Fi receivers to extract the activity-related features, ignoring the communication among multiple Wi-Fi devices in the real world. In this paper, we present a novel Wi-Fi link selection model on the basis of continuous state decision-making process in which CSI is modeled as a part of the state. The model, referred to as WiAgent, takes an action of selecting one Wi-Fi link according to current state, and then updates the state for the choice of the next action. From extensive experiment results, our method performs better than other solutions in a given environment where multiple Wi-Fi transmitters exist.

关键词： Training Transmitters Conferences Decision making Receivers Activity recognition Feature extraction

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An One-dimensional Holographic Antenna for RFID Reader 3

An One-dimensional Holographic Antenna for RFID Reader

引用

3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Ren, Xiaokui Deng, Li Li, Shufang Zhang, Chen Feng, Botao Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

A one-dimensional holographic metasurface antenna that can achieve full-angle symmetrical dual-beam rapid scanning while keeping its position unchanged is proposed. The principle of holographic antenna and beam deflec... 详细信息

ISBN: (纸本)9781728190457

关键词： Holography

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Highly Efficient Generation of Non-diffraction Bessel Beams with Metasurface 3

Highly Efficient Generation of Non-diffraction Bessel Beams ...

引用

3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Zeng, Ting Deng, Li Li, Shufang Feng, Botao Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9781728190457

A reflection metasurface that can generate non-diffraction Bessel beams and achieve anomalous reflection with high efficiency at 5.8 GHz is proposed in this paper. The unit it utilizes has excellent amplitude and phase characteristics, greatly facilitating the construction of the proposed metasurface and laying a solid foundation for the improvement of efficiency. According to non-diffraction theory and anomalous reflection law, two metasurfaces are designed for comparison. The simulation results show that the designed metasurfaces successfully realize the non-diffractive beam with a focusing distance of 126 mm (2.44 λ0), and can bend the normally reflected wave to the direction 10° from the +z direction in a vertical plane 45° away from the +x direction. The average efficiency of the metasurface within the focusing range is as high as 84.5%, thus could be used as radio energy transmission, telecommunication multiplexing and accurate detection devices. © 2020 IEEE.

关键词： Diffraction

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Reflective Metasurface for Controlling the Beam Divergence Angles of Dual-mode OAM Waves 3

Reflective Metasurface for Controlling the Beam Divergence A...

引用

3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： He, Xiaoyuan Deng, Li Feng, Botao Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9781728190457

For dealing with the problem of receiving multimode orbital-angular momentum (OAM) waves resulting from different beam divergence angles of OAM waves with different topological charges, it is essential to control the beam divergence angles of OAM waves. In this paper, a method is proposed to control the beam divergence angles of multi-mode OAM waves without modifying the inherent topological charges by a reflective metasurface. Based on this method, a reflective metasurface is properly designed to generate dual-mode OAM waves with equal beam divergence angle. As a dual-mode OAM waves generator, the reflective metasurface is composed of 31x31 metal-insulator-metal elements which is capable to manipulate dual-polarized electromagnetic waves (EMWs) independently. Furthermore, as a beam divergence controller, the reflective metasurface is properly divided into two regions that are responsible for +1 mode and +3 mode OAM waves generations. In this way, dual-mode OAM waves with equal beam divergence angle can be generated by the proposed reflective metasurface. The proposed design provides an efficient technology to control the beam divergence angles of multi-mode OAM waves flexibly, which is conductive to simplify the receiving device in OAM based communication systems. © 2020 IEEE.

关键词： Topology

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Use OFDM in OAM Communication to Redcuce Multi-path Effects 3

Use OFDM in OAM Communication to Redcuce Multi-path Effects

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3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Shu, Jingyue Deng, Li Li, Shufang Feng, Botao Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9781728190457

The orbital angular momentum (OAM) has raised great attention for its potential to enhance the capacity of wireless communication system. The performance of OAM communication is dependent on the accuracy of phase information. In multi-path channel, the accuracy is destroyed. In this paper, we use orthogonal frequency division multiplexing (OFDM)before OAM modulation to enhance communication performance. © 2020 IEEE.

关键词： Orthogonal frequency division multiplexing

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An Omni-directional Array Antenna with a Feeding Structure in Series 3

An Omni-directional Array Antenna with a Feeding Structure i...

引用

3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Liu, YaQi Feng, Botao Deng, Li College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781728190457

An omni-directional broad-band microstrip array antenna is proposed in this work. The serial feed and antenna array technology are combined to design an antenna array which can satisfy the demands of both omni-directionality in H-plane and high gain. The radiating patches are printed on dual sides of a printed circuit board (PCB) with an overall size of 128 mm × 7.5 mm × 1 mm. An operating bandwidth of 1975 MHz (5.15-7.125 GHz) is achieved, which is suitable for WiFi-6 wireless communication systems. © 2020 IEEE.

关键词： Antenna arrays

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A Novel Omni-directional Antenna with Low Gain Variations for WiFi Communications 3

A Novel Omni-directional Antenna with Low Gain Variations fo...

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3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Deng, Wucai Feng, Botao Deng, Li College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781728190457

An omni-directional monopole antenna with low gain variations is presented for Wireless Fidelity (WiFi) communications in this paper. Compared with the conventional microstrip antenna, the novel patch antenna with simple structure shows good performance in the aspects of high gain and low gain variations. Within ±1dB gain variations, dual bandwidths of 2.41GHz-2.57 GHz (6.4%) and 2.87 GHz-3.77 GHz (27.1%) are achieved for WIFI communication systems. To acquire the dual-band and omni-directional characteristics, the rectangular patch etched with an annular-ring slot is employed. Owing to the coplanar waveguide (CPW) feeding structure, the proposed antenna has an excellent performance of a stable gain of 2±0.5 dBi. © 2020 IEEE.

关键词： Microstrip antennas

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A Wideband Omni-directional Antenna Based on Printed Log-Periodic Element 3

A Wideband Omni-directional Antenna Based on Printed Log-Per...

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3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Li, Liangying Yan, Wei Feng, Botao Deng, Li College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781728190457

In this paper, a novel omni-directional antenna with wideband and low cross-polarization for GSM1800/3G/LTE/5G indoor communication systems is proposed. By using the printed log-periodical antenna elements, which are evenly arranged around the center, the proposed antenna achieves the omnidirectional radiation patterns. Moreover, with the cooperation of the log-periodical antenna and the annular parasitic patches, a wide bandwidth and a good omnidirectional radiation performance are achieved simultaneously. Simulated results indicate that an impedance bandwidth of 1.7-3.8 GHz (76.4%) can be achieved with a gain of approximately 1.5 dBi across the whole operating frequency. Low cross-polarization level of less than-30 dB and compact size are also acquired. © 2020 IEEE.

关键词： Electric impedance

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A Dual-Polarized Omnidirectional Antenna with High Isolation for 2G/3G/LTE/5G Scenarios 3

A Dual-Polarized Omnidirectional Antenna with High Isolation...

引用

3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

作者： Li, Haoming Cao, Wenhua Feng, Botao Deng, Li College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781728190457

This paper presents a dual polarized omnidirectional antenna with high isolation for 3G/LTE/5G scenarios. The antenna is comprised of two parts: a vertically polarized radiating element composed of 3 copper patches and a horizontally polarized radiating element composed of 4 printed dipoles and a four-way power divider. The overall profile height of the antenna is 0.3 λ0 (where λ0 is the starting wavelength). Simulation results show that the overlapped bandwidth between horizontal polarization (HP) and vertical polarization (VP) is 1.66-3.65 GHz, and the isolation is less than-42 dB. Moreover, low gain variations within 3 dB in both VP and HP directions can also be attained, which means good omni-directional characteristics. © 2020 IEEE.

关键词： Omnidirectional antennas

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A Wide-Beamwidth Magneto-Electric Dipole Antenna with Low Cross-Polarization and High Front-to-Back Ratio 3

A Wide-Beamwidth Magneto-Electric Dipole Antenna with Low Cr...

引用

3rd IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2020

ISBN: (纸本)9781728190457

A novel magneto-electric (ME) dipole antenna is presented in this paper, which owns the characteristics of low cross polarization level and high front-to-back ratio (FBR) for the Sth-generation (5G) indoor communications is described. By dividing the conventional patches into two pairs of rectangle patches and four pieces of parasitic patches, the current which produces cross-polarization can be offset. Furthermore, the vertical fence can effectively widen the beamwidth of antenna. Experiment results demonstrate that a broad frequency bandwidth of 3.3-4.2 GHz (24%) can be achieved for 5G communications. Besides, a cross-polarization level below-20 dB and a FBR level of approximately 26 dB in the operating bands. Noting that a wide beamwidth of 100° for E-plane and H-plane is also obtained. © 2020 IEEE.

关键词： Polarization

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