H
H.H. Xia
Publications - 12
Citations - 823
H.H. Xia is an academic researcher. The author has contributed to research in topics: Radio propagation & Antenna (radio). The author has an hindex of 7, co-authored 12 publications receiving 809 citations.
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Journal ArticleDOI
Radio propagation characteristics for line-of-sight microcellular and personal communications
TL;DR: In this article, a comprehensive measurement program was conducted by Telesis Technologies Laboratory (TTL) in the San Francisco Bay area using three base station antenna heights of 3.2 m, 8.7 m, and 13.4 m and two frequencies at 900 MHz and 1900 MHz.
Journal ArticleDOI
UHF propagation prediction for wireless personal communications
TL;DR: The paper starts by reviewing the characteristic signal variations observed in CMR systems employing high base station antennas to cover macrocells having radius out to 20 km, and discusses advances in site specific prediction for outdoor and indoor propagation.
Journal ArticleDOI
Microcellular propagation characteristics for personal communications in urban and suburban environments
TL;DR: The paper reports the path loss measurements made in urban and suburban areas where the receiving mobile was driven along preselected line-of-sight, zig-zag, and staircase routes to gather information about direct propagation along streets, as well as diffraction over the roofs in suburban areas, and diffraction around the corners in urban areas.
Journal ArticleDOI
IMT-2000 standards: radio aspects
R.D. Carsello,R. Meidan,S. Allpress,F. O'Brien,J.A. Tarallo,N. Ziesse,A. Arunachalam,J.M. Costa,E. Berruto,R.C. Kirby,A. Maclatchy,F. Watanabe,H.H. Xia +12 more
TL;DR: The article overviews the technology facilitators that, by the year 2000, will greatly assist the economic implementation of these new systems and the ITU process for the selection of radio technologies that will fulfil these ambitious requirements is outlined.
Proceedings ArticleDOI
Radio propagation measurements and modelling for line-of-sight microcellular systems
TL;DR: For all LOS measurements even in different environments, the variation of signal strength with distance was found to show distinct ear and far regions separated by a break point, and the location of the break point for different frequencies and antenna heights could be calculated based on first Fresnel zone clearance.