NDLI: Signal to noise ratio measurements of directional versus omnidirectional antennas at 1990 MHz

Content Provider	IEEE Xplore Digital Library
Author	Perini, P.L. Bhobe, A.U.
Copyright Year	2000
Description	Author affiliation: US West Adv. Technol., Boulder, CO, USA (Perini, P.L.)
Abstract	We evaluate the SNR of a 1.25 MHz channel in three antenna receive configurations at 1990 MHz. In particular, we evaluate the SNR both inside and outside an apartment using two omnidirectional antennas and one directional antenna. Other results we derive include wall penetration or propagation loss into the residence as well as the noise rise. We test two multi-dwelling units (MDUs) in different orientations to the transmitter and compare results. In general the results suggest that a directional antenna placed outside the apartment typically has a higher SNR than the omnidirectional antenna placed inside the residence. Furthermore, the SNR of all three antennas tested outside the apartment was higher that the SNR measured indoors. Contributing factors to the degradation of SNR indoors are both penetration loss into the residence as well noise rise experienced when placing the antenna indoors. The results in the paper are from field experiments conducted at US WEST Advanced Technologies in Boulder, Colorado. Theoretical treatments to the expected antenna noise temperature are also discussed.
Starting Page	171
Ending Page	178
File Size	636119
Page Count	8
File Format	PDF
ISBN	0780358465
ISSN	1095323X
DOI	10.1109/AERO.2000.879385
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-03-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Signal to noise ratio Noise measurement Antennas and propagation Antenna measurements Directive antennas Directional antennas Testing Receiving antennas Propagation losses Transmitters
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

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