NDLI: A novel polarization smart antenna

Content Provider	IEEE Xplore Digital Library
Author	Shapira, J. Miller, S.
Copyright Year	2001
Description	Author affiliation: Celletra Ltd., Yokne'am, Israel (Shapira, J.)
Abstract	The wave propagating through the mobile channel becomes partially depolarised by polarization-dependent scattering. Measurements of the amount of depolarization (XPD-cross polarization discrimination) for linear polarizations reveal an energy transfer of -8 to -15 dB to the orthogonal polarization in outdoor propagation, indicating that the wave is essentially polarized. The independent fading of the wave components are commonly interpreted as being randomly polarized but the histogram of the incident wave appears to be bounded by an eccentric ellipse-like shape with an axial-ratio equal to the value of XPD. Moreover, the measured projection of the averaged-in-time polarization of the incident wave is found to be highly correlated over a wide frequency bandwidth. This observation serves as the foundation for a new polarization-matching algorithm, whereby the time-average polarization of the incident wave serves to adjust the polarization of the transmission back to each individual mobile station (MS). This process recovers a substantial portion of the polarization-induced transmission losses that may exceed 10 dB, and serves to reduce the forward power control variations, and the average transmit power of the base-transceiver-station (BTS), as well as the induced interference. The paper presents the proof-of-concept polarization matching trial, and the analysis of the results. A novel polarization-matching smart-antenna system architecture is described.
Starting Page	253
Ending Page	257
File Size	525804
Page Count	5
File Format	PDF
ISBN	0780367286
ISSN	10903038
DOI	10.1109/VETECS.2001.944842
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-06
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Polarization Antennas and propagation Scattering Antenna measurements Energy measurement Energy exchange Fading Histograms Shape Frequency measurement
Content Type	Text
Resource Type	Article

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