Exploring a large dataset : typical behavior of UHF signal propagation
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2020Copyright
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Radioverkon suunnittelua ja käyttöä varten täytyy radio aaltojen
eteneminen ymmärtää hyvin. Tässä tutkimuksessa tutustutaan laajaan mittausaineistoon
hetkellisiä tehoja maanlaajuisesta UHF verkosta. Spektrianalyysillä todettiin mitatussa
tehossa olevan jaksollista vaihtelua taajuuksilla kerran ja kahdesti päivässä. Myös nopeampaa
vaihtelua välillä 0:1 mHz ja 1:4 mHz todettiin 34% yhteyksistä. Hierarkisella ryhmittelyllä
etsittiin tyypilliset mittausten arvojakaumat. Saaduissa arvojakaumien ryhmissä oli eri
levyisiä vasemmalle tai oikealle vinoja tai symmetrisiä jakaumia. The design and operation of radio networks requires good understanding of radio
propagation. This study explores a dataset containing measured instantaneous power values
from a statewide UHF network. Using spectral analysis the measured power was found to
have periodic variations of once and twice per day. Faster variation between 0:1 mHz and
1:4 mHz was also detected in 34% of the connections. Hierarchical clustering was used to
determine typical value distributions of the measurements. Clusters of symmetric, positively
skewed or negatively skewed value distributions and several widths were found.
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