DocumentCode :
826783
Title :
Inexpensive upgrade of base-station dumb antennas by two magnetic loops for "blind" adaptive downlink beamforming
Author :
Wong, Kainam Thomas ; Lai, Albert Kin-Yue
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Volume :
47
Issue :
1
fYear :
2005
fDate :
2/1/2005 12:00:00 AM
Firstpage :
189
Lastpage :
193
Abstract :
A simple scheme is herein proposed to upgrade an older base-station\´s "dumb" antennas for use in an adaptive space-division frequency-reuse downlink, with no expensive retrofitting of each "dumb" antenna with its own rake receiver. This scheme adds only two horizontally oriented loops (plus an optional vertically oriented dipole) to a base station\´s 120°-azimuth sector, each with a temporal (not space-time) rake receiver. Such a pair (or triad) of diversely polarized but collocated antennas can estimate an incident mobile-source\´s uplink direction of arrival, based on which the existing "dumb" antennas can beam-form towards the mobile in downlink transmission.
Keywords :
antenna arrays; array signal processing; dipole antennas; direction-of-arrival estimation; frequency allocation; mobile radio; radio links; radio receivers; adaptive space-division frequency-reuse downlink; base-station dumb antenna; blind adaptive downlink beamforming; collocated antenna; direction of arrival estimation; horizontally oriented loop; incident mobile-source uplink; magnetic loop; rake receiver; Adaptive arrays; Array signal processing; Dipole antennas; Directive antennas; Downlink; Fading; Mobile antennas; Multipath channels; Receiving antennas; Transmitting antennas;
fLanguage :
English
Journal_Title :
Antennas and Propagation Magazine, IEEE
Publisher :
ieee
ISSN :
1045-9243
Type :
jour
DOI :
10.1109/MAP.2005.1436274
Filename :
1436274
Link To Document :
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