- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Measurements of Beamswitching Gains and Fade Dynamics for 28 GHz Indoor Static Links in the Presence of Pedestrian Traffic
摘要： We measured channel dynamics for fixed wireless indoor channels at 28 GHz. We characterize pedestrian-induced fades in open indoor spaces and the effectiveness of beamswitching to mitigate them. We find that fades of the dominant propagation path may be as deep as 9 dB at the 90th percentile and that alternative signal paths are typically not strong enough to provide significant beamswitching gains.
关键词： Millimeter wave propagation,Rician channels,Channel models,Multipath channels,Fading channels
更新于2025-09-23 15:22:29
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Epitaxial GaAs Lift Off via III-VI Layered Compounds
摘要： The global bandwidth shortage facing wireless carriers has motivated the exploration of the underutilized millimeter wave (mm-wave) frequency spectrum for future broadband cellular communication networks. There is, however, little knowledge about cellular mm-wave propagation in densely populated indoor and outdoor environments. Obtaining this information is vital for the design and operation of future fifth generation cellular networks that use the mm-wave spectrum. In this paper, we present the motivation for new mm-wave cellular systems, methodology, and hardware for measurements and offer a variety of measurement results that show 28 and 38 GHz frequencies can be used when employing steerable directional antennas at base stations and mobile devices.
关键词： 5G,cellular,MIMO,millimeter wave propagation measurements,28GHz,directional antennas,38GHz,channel models,mobile communications
更新于2025-09-16 10:30:52
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Atmospheric Effects on Millimeter and Sub-millimeter (THz) Satellite Communication Paths
摘要： Satellite communications require more bandwidth due to the necessity of increasing the capacity of communication channels and bandwidth to end-users. As a result, looking for new bands is required in the electromagnetic spectrum including millimeter and sub-millimeter wavelengths. Recent technological developments made the extremely high frequencies (EHF) above 30 GHz as a candidate for wireless applications such as the fifth generation (5G) of mobile communications, high resolution radars, and remote sensing. The EHF communication systems are becoming more and more commercial, cheap, and compact. However, the fact that the atmospheric medium is not completely transparent to millimeter waves requires considerations of the frequency selective absorption and dispersion effects emerging in this band. These phenomena affect also remote sensing in the millimeter and sub-millimeter waves (the terahertz frequencies). The atmospheric effects on the propagation of millimeter and sub-millimeter wave transmission from land to satellite are discussed. It is shown that not only atmospheric absorption plays a significant role on the received signal strength but also the refraction index of the atmospheric medium. The inhomogeneous refractivity causes the beam to Bbend^ along the propagation path, and it may even Bmiss^ its destination. This phenomenon should be considered in the design of a link operating in extremely high frequencies involving highly directive antennas.
关键词： Millimeter wave propagation,Terahertz waves,Millimeter wave satellite communications
更新于2025-09-10 09:29:36
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Increased reliability of outdoor millimeter-wave link simulations by leveraging lidar point cloud
摘要： Exploitation of the millimeter-wave (mmWave) band for both the small-cell radio access (RAN) and in-street backhauling must contribute to strongly increase the capacity of next-generation outdoor wireless networks. Beside the numerous technological challenges faced by the equipment manufacturers, the definition of practical deployment requirements and elaboration of efficient network design procedures are key issues for future network providers and the refinement of business models. The work reported in the present paper is part of research activity on small-cell and wireless backhaul design methodologies. The authors analyze how digital geographical data and radio propagation models may be enhanced and tailored to answer new mmWave simulation requirements. Three different propagation methods are compared in an urban 60 GHz scenario: based on free building database, traditional high-resolution map data, or Lidar point cloud. The advantage of the multi-paths prediction versus direct-path is also investigated, using the Lidar point cloud as a simulation input.
关键词： millimeter-wave propagation,Lidar point cloud,simulation
更新于2025-09-04 15:30:14