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A Distributed Acoustic Sensing System for Vibration Detection and Classification in Railways

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zte Communications 2024年第2期22卷 80-84页

作者： ZHU Songlin WANG Zhongyi XIE Yunpeng SUN Zhi Wireline Product Planning department ZTE CorporationShanghai 201203China Shenzhen Branch of China Telecom Corporation Limited Shenzhen 518000China

A distributed acoustic sensing(DAS)system is proposed and a data processing method for vibration is designed in this paper.The proposed DAS system is based on the Rayleigh scattering signal and utilizes phase-sensitive optical time-domain reflectometry(φ-OTDR)to demodulate the environmental vibration.It can collect the vibration information in railways and implement vibration classification based on the feature of sensed vibration signals.This system has been deployed in Guangzhou Shenzhen High-Speed Railway,and the experimental results validate its effectiveness.

关键词： DAS φ-OTDR vibration classification

Special Topic on Near-Field Communication and Sensing Towards 6G

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zte Communications 2024年第1期22卷 1-2页

作者： WEI Guo ZHAO Yajun CHEN Li 不详 the Wireless and Computing Product R&D Institute ZTE Corporation department of Electronic Engineering and Information Science USTC

6G wireless technologies involve dense device deployment,utilize large-scale antenna arrays,and operate in the millimeter-wave and terahertz bands.This will shift the challenges of communication and sensing from the far field to the radiative near field,where traditional models and algorithms may incur errors or even become obsolete due to mismatch.Therefore,there is an urgent need to discuss localization and communication issues in the near-field region.The near-field assumption allows us to capture more information in electromagnetic signals,unlocking new possibilities for improving communication quality and localization accuracy.It can be anticipated that research on the near-field will play an increasingly important role in 6G and future wireless networks.

关键词： communication millimeter antenna

Real-Time 4-Mode MDM Transmission Using Commercial 400G OTN Transceivers and All-Fiber Mode Multiplexers

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zte Communications 2024年第1期22卷 106-110页

作者： REN Fang LI Yidan YE Bing LIU Jianguo CHEN Weizhang School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China department of WDM System Design ZTE CorporationBeijing 100029China

Weakly-coupled mode division multiplexing(MDM)technique is considered a promising candidate to enhance the capacity of an optical transmission system,in which mode multiplexers/demultiplexers(MMUX/MDEMUX)with low insertion loss and modal crosstalk are the key components.In this paper,a low-modal-crosstalk 4-mode MMUX/MDEMUX for the weakly-coupled triple-ring-core few-mode fiber(TRC-FMF)is designed and fabricated with side-polishing processing.The measurement results show that a pair of MMUX/MDEMUX and 25 km weakly-coupled TRC-FMF MDM link achieve low modal crosstalk of lower than−17.5 dB and insertion loss of lower than 11.56 dB for all the four modes.Based on the TRC-FMF and all-fiber MMUX/MDEMUX,an experiment for 25 km real-time 4-mode 3-λwavelength division multiplexing(WDM)-MDM transmission is conducted using commercial 400G optical transport network(OTN)transceivers.The experimental results prove weakly-coupled MDM techniques facilitate a smooth upgrade of the optical transmission system.

关键词： optical fiber couplers mode(de)multiplexers mode division multiplexing transmission

Age of Information Based User Scheduling and Data Assignment in Multi-User Mobile Edge Computing Networks:An Online Algorithm

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China Communications 2024年第5期21卷 153-165页

作者： Ge Yiyang Xiong Ke Dong Rui Lu Yang Fan Pingyi Qu Gang School of Computer and Information Technology Beijing Jiaotong UniversityBeijing 100044China Engineering research Center of Network Management Technology for High Speed Railway of Ministry of Education Beijing 100044China Beijing Engineering research Center of High-speed Railway Broadband Mobile Communications Beijing 100044China department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China department of Electrical and Computer Engineering College ParkMarylandUSA

This paper investigates the age of information(AoI)-based multi-user mobile edge computing(MEC)network with partial offloading mode.The weighted sum AoI(WSA)is first analyzed and derived,and then a WSA minimization problem is formulated by jointly optimizing the user scheduling and data assignment.Due to the non-analytic expression of the WSA w.***.t.the optimization variables and the unknowability of future network information,the problem cannot be solved with known solution methods.Therefore,an online Joint Partial Offloading and User Scheduling Optimization(JPOUSO)algorithm is proposed by transforming the original problem into a single-slot data assignment subproblem and a single-slot user scheduling sub-problem and solving the two sub-problems separately.We analyze the computational complexity of the presented JPO-USO algorithm,which is of O(N),with N being the number of users.Simulation results show that the proposed JPO-USO algorithm is able to achieve better AoI performance compared with various baseline methods.It is shown that both the user’s data assignment and the user’s AoI should be jointly taken into account to decrease the system WSA when scheduling users.

关键词： age of information(aoi) mobile edge computing(mec) user scheduling

Waveguide Bragg Grating for Fault Localization in PON

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zte Communications 2024年第2期22卷 94-98页

作者： HU Jin LIU Xu ZHU Songlin ZHUANG Yudi WU Yuejun XIA Xiang HE Zuyuan School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Wireline Product Planning department ZTE CorporationShanghai 201203China Hangzhou Electric Connector Factory Hangzhou 310052China

Femtosecond laser direct inscription is a technique especially useful for prototyping purposes due to its distinctive advantages such as high fabrication accuracy,true 3D processing flexibility,and no need for mold or photomask.In this paper,we demonstrate the design and fabrication of a planar lightwave circuit(PLC)power splitter encoded with waveguide Bragg gratings(WBG)using a femtosecond laser inscription technique for passive optical network(PON)fault localization application.Both the reflected wavelengths and intervals of WBGs can be conveniently tuned.In the experiment,we succeeded in directly inscribing WBGs in 1×4 PLC splitter chips with a wavelength interval of about 4 nm and an adjustable reflectivity of up to 70% in the C-band.The proposed method is suitable for the prototyping of a PLC splitter encoded with WBG for PON fault localization applications.

关键词： planar light circuit power splitter waveguide Bragg gratings femtosecond laser optical network fault localization

Codebook Design and Beam Training for Extremely Large-Scale RIS:Far-Field or Near-Field?

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China Communications 2022年第6期19卷 193-204页

作者： Xiuhong Wei Linglong Dai Yajun Zhao Guanghui Yu Xiangyang Duan Beijing National research Center for Information Science and Technology(BNRist)as well as the department of Electronic Engineering Tsinghua UniversityBeijing 100084China zte Corporation Shenzhen 518038China

Reconfigurable intelligent surface(RIS)is more likely to develop into extremely large-scale RIS(XL-RIS)to efficiently boost the system capacity for future 6 G communications.Beam training is an effective way to acquire channel state information(CSI)for XL-RIS.Existing beam training schemes rely on the far-field codebook.However,due to the large aperture of XL-RIS,the scatters are more likely to be in the near-field region of XL-RIS.The far-field codebook mismatches the near-field channel model.Thus,the existing far-field beam training scheme will cause severe performance loss in the XL-RIS assisted nearfield communications.To solve this problem,we propose the efficient near-field beam training schemes by designing the near-field codebook to match the nearfield channel model.Specifically,we firstly design the near-field codebook by considering the near-field cascaded array steering vector of XL-RIS.Then,the optimal codeword for XL-RIS is obtained by the exhausted training procedure.To reduce the beam training overhead,we further design a hierarchical nearfield codebook and propose the corresponding hierarchical near-field beam training scheme,where different levels of sub-codebooks are searched in turn with reduced codebook size.Simulation results show the proposed near-field beam training schemes outperform the existing far-field beam training scheme.

关键词： extremely large-scale RIS near-field codebook design beam training

Investigation and Comparison of 5G Channel Models: From Qua DRi Ga, NYUSIM,and MG5G Perspectives

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Chinese Journal of Electronics 2022年第1期31卷 1-17页

作者： PANG Lihua ZHANG Jin ZHANG Yang HUANG Xinyi CHEN Yijian LI Jiandong School of Communication and Information Engineering Xi'an University of Science and Technology State Key Laboratory of Integrated Service Networks Xidian University National Mobile Communications research Laboratory Southeast University Algorithm department ZTE Corporation

This paper investigates and compares three channel models for the fifth generation(5 G) wireless communications: the quasi deterministic radio channel generator(Qua DRi Ga), the NYUSIM channel simulator model developed by New York University, and the more general 5 G(MG5 G) channel model. First, the characteristics of the modeling processes of the three models are introduced from the perspective of model framework.Then, the small-scale parameter modeling strategies of the three models are compared from space/time/frequency domains as well as polarization aspect. In particular, the drifting of small-scale parameters is introduced in detail.Finally, through the simulation results of angular power spectrum, Doppler power spectrum density, temporal autocorrelation function, power delay profile, frequency correlation function, channel capacity, and eigenvalue distribution, the three models are comprehensively investigated. According to the simulation results, we clearly analyze the impact of the modeling strategy on the three channel models and give certain evaluations and suggestion which lay a solid foundation for link and system-level simulations for 5 G transmission algorithms.

关键词： 5G Channel model Small-scale parameter Modeling strategy Channel simulation

An Improved Color Cast Detection Method Based on an AB-Chromaticity Histogram

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zte Communications 2013年第1期11卷 41-43页

作者： Ping Lu Xia Jia Tirui Wu pre-research department of zte Corporation

AB-chromaticity histogram analysis works well most of the time, but it may not work well when the color cast is not severe. To overcome this problem, we propose an improved, two-step automatic cast-detection method. First, we compute the RGB color variance to evaluate the quality of the input image. If this variance is very small, we extract near-neutral color areas and compute the local ab-chromaticity histogram. We use this local ab-chromaticity histogram to evaluate the quality of the input image. This method has been tested in zte＇ s video surveil- lance system. The results show that the proposed method pro- duces better results based on subjective evaluation and is more efficient in various conditions.

关键词： color cast AB-chromaticity histogram near-neutral color areas

A 26-Gb/s CMOS optical receiver with a reference-less CDR in 65-nm CMOS

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Journal of Semiconductors 2022年第7期43卷 68-77页

作者： Quan Pan Xiongshi Luo Zhenghao Li Zhengzhe Jia Fuzhan Chen Xuewei Ding C.Patrick Yue School of Microelectronics Engineering Research Center of Integrated Circuits for Next-Generation CommunicationsMinistry of EducationSouthern University of Science and TechnologyShenzhen 518055China department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyHong Kong SARChina zte Microelectronics Shenzhen 518055China

This paper presents a 26-Gb/s CMOS optical receiver that is fabricated in 65-nm technology. It consists of a tripleinductive transimpedance amplifier(TIA), direct current(DC) offset cancellation circuits, 3-stage gm-TIA variable-gain amplifiers(VGA), and a reference-less clock and data recovery(CDR) circuit with built-in equalization technique. The TIA/VGA frontend measurement results demonstrate 72-dB? transimpedance gain, 20.4-GHz-3-dB bandwidth, and 12-dB DC gain tuning range. The measurements of the VGA’s resistive networks also demonstrate its efficient capability of overcoming the voltage and temperature variations. The CDR adopts a full-rate topology with 12-dB imbedded equalization tuning range. Optical measurements of this chipset achieve a 10-12 BER at 26 Gb/s for a 2;-1 PRBS input with a-7.3-dBm input sensitivity. The measurement results with a 10-dB @ 13 GHz attenuator also demonstrate the effectiveness of the gain tuning capability and the built-in equalization. The entire system consumes 140 mW from a 1/1.2-V supply.

关键词： clock and data recovery equalizer optical receiver transimpedance amplifier variable-gain amplifier