Avoiding ambiguity in beamspace processing

Ali Nasiri Amini, Tryphon T. Georgiou

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


In direction finding of narrow-band signals using antenna arrays with a large number of elements, the so-called beamspace matrix is often used to project the measurements into a lower dimension subspace. This reduces computation time and allows for parallel processing. On the other hand, beamspace preprocessing may introduce ambiguity, i.e., spurious estimated directions. We show that when the null space of the beamspace matrix is suitably designed, ambiguity within any sector of interest can be avoided.

Original languageEnglish (US)
Pages (from-to)372-375
Number of pages4
JournalIEEE Signal Processing Letters
Issue number5
StatePublished - May 2005

Bibliographical note

Funding Information:
Manuscript received August 30, 2004; revised December 10, 2004. This work was supported in part by the National Science Foundation and the Air Force Office of Scientific Research. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Dimitri Van De Ville.

Copyright 2008 Elsevier B.V., All rights reserved.


  • Antenna arrays
  • Direction of arrival (DOA) estimation
  • Spectral analysis

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