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/spl deg/-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.
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