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Free-space optical channel characterization in a coastal environment

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Journal of Communications and Information Networks 2017年第4期2卷 100-106页

作者： Wael G.Alheadary Ki-Hong Park Boon S.Ooi Mohamed-Slim Alouini Computer Electricaland Mathematical Sciences and Engineering(CEMSE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900Saudi Arabia

Recently,FSO(Free-Space Optical Communication)has received a lot of attention thanks to its high data-rate transmission via unbounded unlicensed ***,some weather conditions lead to significant degradation of the FSO link *** on this context and in order to have a better understanding of the capabilities of FSO communication in a coastal environment,the effects of temperature and humidity on an FSO system are investigated in this *** experiment is conducted using an open source FSO system that achieves a transmission rate of 1 Gbit/s at a distance of 70 *** new mathematical models are proposed to represent the effects of temperature and humidity on our developed FSO system operating at a wavelength of 1550 *** first model links the FSO attenuation coefficient to the air temperature in coastal regions,while the second model links the FSO attenuation coefficient to the humidity and the dew-point *** key finding of this study is that FSO links can achieve maximum availability in a coastal city with normal variations in temperature and humidity.

关键词： FSO optical systems relative humidity temperature channel characterization attenuation coefficient

Measurement-Based channel characterization for 5G Wireless Communications on Campus Scenario

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ZTE Communications 2017年第1期15卷 8-13页

作者： YANG Mi HE Ruisi AI Bo XIONG Lei DONG Honghui LI Jianzhi WANG Wei FAN Wei QIN Hongfeng Beijing Jiaotong University Beijing 100044China German Aerospace Center(DLR) Münchner Strasse 2082234 WesslingGermany Aalborg University Aalborg 9220Denmark Xi’an R&D Center ZTE CorporationXi’an 710114China

The fifth generation(5G)communication has been a hotspot of research in recent years,and both research institutions and industrial enterprises put a lot of interests in 5G communications at some new frequency *** this paper,we investigate the radio channels of 5G systems below 6 GHz according to the 5G communication requirements and *** measurements were conducted on the campus of Beijing Jiaotong University,China at two key optional frequency bands below 6 *** using the measured data,we analyzed key channel parameters at 460 MHz and 3.5 GHz,such as power delay profile,path loss exponent,shadow fading,and delay *** results are helpful for the 5G communication system design.

关键词： channel measurement 5G channel characterization

Measurements and characterization for the Vehicle-to-Infrastructure channel in Urban and Highway Scenarios at 5.92GHz

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China Communications 2022年第4期19卷 28-43页

作者： Yuanyuan Fan Yi Feng Liu Liu Shuoshuo Dong Zhaoyang Su Jiahui Qiu Xiaobo Lin School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China China United Network Communications Group Co. Ltd.Beijing 100033China

In the future smart transportation system, reliable vehicle-to-infrastructure(V2 I) communication is very important to ensure vehicle driving safety and to improve vehicle driving efficiency. In this paper, V2 I channel measurements at 5.92 GHz are conducted in typical urban and highway *** frequency and bandwidth of transmission, as well as the deployment of the RSU(roadside unit) and the OBU(on board unit), are selected by considering the recommendation proposed by 3 GPP TR 36.885. Then,based on the measured data, the key channel characteristic parameters of the V2 I channel are extracted,including path loss, root-mean-square delay spread,stationarity distance, and Doppler spread, etc. Also,the statistical characteristics of the parameters, including time-varying and Doppler characteristics, are investigated and characterized. The work in this paper helps researchers design technology and communication systems in similar scenarios.

关键词： vehicle-to-infrastructure channel characterization measurement urban scenario highway scenario

Key technologies for wireless network digital twin towards smart railways

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High-Speed Railway 2024年第1期2卷 1-10页

作者： Ke Guan Xinghai Guo Danping He Philipp Svoboda Marion Berbineau Stephen Wang Bo Ai Zhangdui Zhong Markus Rupp State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China Christian Doppler Laboratory for Digital Twin Assisted AI for Sustainable Radio Access Networks Institute of TelecommunicationsTU WienVienna 1040Austria UniversitéGustave Eiffel COSYSLEOSTVilleneuve d′Ascq 59650France VIAVI Marconi Labs VIAVI SolutionsStevenage SG12ANUK Institute of Telecommunications TU WienVienna 1040Austria

An emerging railway technology called smart railway promises to deliver higher transportation efficiency,enhanced comfort in services,and greater *** smart railway is expected to integrate fifth-generation mobile communication(5G),Artificial Intelligence(AI),and other technologies,which poses new problems in the construction,operation and maintenance of railway wireless *** Digital Twins(DTs),which have recently emerged as a new paradigm for the design of wireless networks,can address these problems and enable the whole lifecycle management of railway wireless ***,there are still many scientific issues and challenges for railway-oriented wireless *** key technologies to solve these problems are introduced and described,including characterization of materials'physical-EM properties,autonomous reconstruction of Three-dimensional(3D)environment model,AI-empowered environmental cognition,Ray-Tracing(RT),model-based and AIbased RT acceleration,and generation of multi-spectra sensing ***,this paper presents our research results for each key technology and describes the wireless network planning and optimization system based on highperformance RT developed by our *** paper outlines the framework for realizing the wireless DT of smart railways,providing the direction for future research.

关键词： Digital twin Smart railways Ray tracing channel characterization

Propagation characterization and Analysis for 5G mmWave Through Field Experiments

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Computers, Materials & Continua 2021年第8期68卷 2249-2264页

作者： Faizan Qamar Mhd Nour Hindia Tharek Abd Rahman Rosilah Hassan Kaharudin Dimyati Quang Ngoc Nguyen Centre for Cyber Security Faculty of Information Science and TechnologyUniversiti Kebangsaan Malaysia(UKM)43600BangiSelangorMalaysia Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603Kuala LumpurMalaysia Wireless Communication Centre Faculty of Electrical EngineeringUniversiti Teknologi Malaysia81310SkudaiJohorMalaysia Department of Computer Science and Communications Engineering Faculty of Science and EngineeringWaseda UniversityTokyo169-8050Japan

The 5G network has been intensively investigated to realize the ongoing early deployment stage as an effort to match the exponential growth of the number of connected users and their increasing demands for high throughput,bandwidth with Quality of Service(QoS),and low *** that most of the spectrums below 6 GHz are nearly used up,it is not feasible to employ the traditional spectrum,which is currently in ***,a promising and highly feasible effort to satisfy this insufficient frequency spectrum is to acquire new frequency bands for next-generation mobile *** this end,the primary effort has been focused on utilizing the millimeter-wave(mmWave)as the most promising candidate for the frequency ***,though the mmWave frequency band can fulfill the desired bandwidth requirements,it has been demonstrated to endure several issues like scattering,atmospheric absorption,fading,and especially penetration losses compared to the existing sub-6 GHz frequency ***,it is fundamental to optimize the mmWave band propagation channel to facilitate the practical 5G implementation for the network ***,this study intends to investigate the outdoor channel characteristics of 26,28,36,and 38 GHz frequency bands for the communication infrastructure at the building to the ground floor in both Line of Sight(LOS)and Non-Line of Sight(NLOS)*** experimental campaign has studied the propagation path loss models such as Floating-Intercept(FI)and Close-In(CI)for the building to ground floor environment in LOS and NLOS *** findings obtained from the field experiments clearly show that the CI propagation model delivers much better performance in comparison with the FI model,thanks to its simple setup,accuracy,and precise function.

关键词： 5G mmWave propagation channel path loss channel characterization field experiment