Inexpensive upgrade of base-station dumb antennas by two magnetic loops for "blind" adaptive downlink beamforming

Kainam Thomas Wong, Albert Kin Yue Lai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)189-193
Number of pages5
JournalIEEE Antennas and Propagation Magazine
Issue number1
Publication statusPublished - 1 Feb 2005
Externally publishedYes


  • Adaptive signal detection
  • Array signal processing
  • Direction of arrival estimation
  • Diversity methods
  • Land mobile radio diversity systems
  • Land mobile radio equipment
  • Multiuser channels

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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