Abstract:
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In this paper a comparative study of two
measurement campaigns carried out in Barcelona, Spain, and
Pozna, Poland, to identify spectrum occupancy in different
bands, is presented. In both cases the measurement setup was
harmonized to obtain comparable results. The problem of
efficient noise floor estimation was also considered and a
pragmatic approach that takes into account both internal and
ambient noise has been proposed. Obtained results show
significant amount of unused spectrum, with similar results for
both sites when analyzed globally (average spectrum occupancy
of 27% in Pozna¿ and 22% in Barcelona). On the contrary, when
going to the detailed analysis of some specific bands, more
relevant differences are obtained. These differences have been
observed mainly in the Terrestrial TRunked RAdio (TETRA)
bands that in Poland are also used by Code Division Multiple
Access (CDMA) 450, as well as in the bands of theGlobal System
for Mobile communications (GSM) due to the effects of Universal
Mobile Telecommunications System (UMTS) refarming in the
900 MHz band. |