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Vehicle-to-Infrastructure Channel Characterization in Urban Environment at 28 GHz

China Communications 2019年第2期16卷 36-48页

作者： Longhe Wang Bo Ai Danping He Ke Guan Jiayi Zhang junhyeong kim Zhangdui Zhong State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Future Mobile Communication Research Division Electronics and Telecommunications Research Institute School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST)

Both ultra-reliable low latency and high-data-rate communications are required by connective vehicles. Millimeter wave(mm Wave) with large bandwidth is a key technology to support high-data-rate communications. In this paper, the 28 GHz wideband vehicle-to-infrastructure channel is characterized for the urban environment in a major street in Manhattan. The deployment of the transmitter and the receiver, as well as the traffic models, are selected by considering the recommendation by 3GPP TR 37.885. Ray tracing simulator with calibrated electromagnetic parameters is employed in this work to practically conduct intensive simulations. The 3D environment model is reconstructed from OpenStreetMap. The power delay profile, path loss, root-meansquare delay spread, K-factor and so on, are extracted from the calibrated simulation results. The evolution of the parameters, as well as their statistical properties, are analyzed and modeled. The work of this paper helps the researchers understand the propagation channel for designing mmWave technologies and communication system in a similar scenario.

关键词： channel characterization mmWave channel ray tracing urban environment vehicular communication

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A Ray Tracing and Joint Spectrum Based Clustering and Tracking Algorithm for Internet of Intelligent Vehicles

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Journal of Communications and Information Networks 2020年第3期5卷 265-281页

作者： Luoyan Zhu Danping He Bo Ai Ke Guan Shuping Dang junhyeong kim Heesang Chung Zhangdui Zhong State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Beijing 100044China CEMSE Division King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Moving Wireless Network Research Section Electronics and Telecommunications Research Institute(ETRI)Daejeon 34129Republic of Korea

Driven by the rapid growth in information services provided by the Internet and the appearance of new multimedia applications,millimeter wave is foreseen as a key enabler towards the Internet of intelligent vehicles(IoIV)for urban traffic safety *** this regard,cluster-based channel modeling has become an important research topic in the realm of emergency *** fully understand the cluster-based channel model,a series of vehicle-to-infrastructure(V2I)channel simulations at 22.6 GHz are conducted by a three-dimensional ray tracing(RT)*** clustering and tracking algorithm is proposed and analyzed from three aspects by the obtained simulation *** multiple signal classification estimation spectrum is applied to restrain the influence of antenna sidelobes and identify targets at *** on the fundamentals,the clusters can be identified and subsequently tracked using the proposed *** impacts of antenna sidelobes,angle resolution of beam rotation,and non-line-of-sight propagation path on the performance of clustering and tracking are *** multi-component-level RT results are adopted as comparison benchmarks,which reflect the ground *** work aims to provide a full picture of the clustering characteristics for designing and analyzing emergency communication systems.

关键词： clustering and tracking algorithm Internet of intelligent vehicles(IoIV) millimeter-wave channel modeling ray tracing vehicle-to-infrastructure(V2I)communications

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Inverse design of a Si-based high-performance vertical-emitting meta-grating coupler on a220 nm silicon-on-insulator platform

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Photonics Research 2023年第6期11卷 897-905页

作者： JINHYEONG YOON JAE-YONG kim junhyeong kim HYEONHO YOON BERKAY NESELI HYO-HOON PARK HAMZA KURT School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea

Efficient extraction of light from a high refractive index silicon waveguide out of a chip is difficult to *** inverse design approach was employed using the particle swarm optimization method to attain a vertical emitting meta-grating coupler with high coupling efficiency in a 220-nm-thick silicon-on-insulator *** carefully selecting the figure of merit and appropriately defining parameter space,unique L-shape and U-shape grating elements that boosted the out-of-plane radiation of light were *** addition,a 65.7%(-1.82 dB)outcoupling efficiency and a 60.2%(-2.2 dB)fiber-to-chip vertical coupling efficiency with an 88 nm 3 dB bandwidth were demonstrated by numerical *** fabrication constraints,the optimized complex meta-grating coupler was modified to correspond to two etching steps and was then fabricated with a complementary metal-oxide-semiconductor-compatible *** modified meta-grating coupler exhibited a simulated coupling efficiency of 57.5%(-2.4 d B)with a 74 nm 3-dB bandwidth in the C-band and an experimentally measured coupling efficiency of 38%(-4.2 dB).

关键词： waveguide coupling insulator

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