Journal of Signal Processing Systems

, Volume 63, Issue 3, pp 277–286 | Cite as

Wideband Beamspace Processing Using Orthogonal Modal Beamformers

  • Thushara Dheemantha AbhayapalaEmail author
  • Darren B. Ward


We introduce a novel beamspace processing structure that can be used for narrowband or wideband sources located either in nearfield or farfield of a sensor array. Main features of the new structure are: (i) a single parameter is used to steer the processor to any desired radial distance; (ii) a set of fixed frequency invariant orthogonal beamformers are used to transform array data into beamspace; and (iii) consequently, only a single set of beamspace weights are needed to process wideband beamspace data. The utility of the novel structure is illustrated by applications in interference cancellation and direction/range estimation.


Broadband beamforming Array processing Adaptive arrays Direction estimation Interference cancellation Nearfield Sensor arrays 


  1. 1.
    Coifman, R., Rokhlin, V., & Wanzura, S. (1993). The fast multipole method for the wave equation: A pedestrian prescription. IEEE Antennas Propagat. Magazine, 35(3), 7–12.CrossRefGoogle Scholar
  2. 2.
    Colton, D., & Kress, R. (1998). Inverse acoustic and electromagnetic scattering theory (2nd ed.). New York: Springer.zbMATHGoogle Scholar
  3. 3.
    Marciano, Jr., J. S., & Vu, T. B. (2000). Reduced complexity MVDR broadband beamspace beamforming under frequency invariant constraint. In International symposium on antennas and propagation (pp. 902–905).Google Scholar
  4. 4.
    Lee, T. (1994). Efficient wideband source localization using beamforming invariancetechnique. IEEE Transactions on Signal Processing, 42(6), 1376–1387.CrossRefGoogle Scholar
  5. 5.
    Agrawal, M., & Prasad, S. (1999). DOA estimation of wideband sources using a harmonic source model and uniform linear array. In IEEE Transactions on Signal Processing (pp. 619–629).Google Scholar
  6. 6.
    MacRobert, T. (1967). Spherical harmonics: An elementary treatise on harmonic functions with applications. London: Pergamon.zbMATHGoogle Scholar
  7. 7.
    Hoffman, M. W., & Buckley, K. M. (1988). Beamspace processing of broadband multiple beam antenna data for source localization. In Proc. twenty-second Asilomar conf. signals, systems and computers (pp. 813–817).Google Scholar
  8. 8.
    Oppenheim, A., Willsky, A., & Nawab, S. (1997). Signals and systems. Upper Saddle River: Prentice Hall.Google Scholar
  9. 9.
    Kittredge, P. F., & Pulsone, N. B. (2000). Wideband angle estimation techniques for a beamspace application. In Sensor array and multichannel signal processing workshop (pp. 474–478).Google Scholar
  10. 10.
    Schmidt, R. (1986). Multiple emitter location and signal parameter estimation. IEEE Transactions on Antennas and Propagation, 34(3), 276–280.CrossRefGoogle Scholar
  11. 11.
    Sekiguchi, T., & Karasawa, Y. (2000). Wideband beamspace adaptive array utilizing FIR fan filters formultibeam forming. IEEE Transactions on Signal Processing, 48(1), 277–284CrossRefGoogle Scholar
  12. 12.
    Abhayapala, T. D., & Bhatta, H. (2003). Coherent broadband source localization by modal space processing. In 10th international conference on telecommunications (Vol. 2, pp. 1617–1623).Google Scholar
  13. 13.
    Abhayapala, T. D., Kennedy, R. A., & Williamson, R. C. (2000). Nearfield broadband array design using a radially invariant modal expansion. Journal of Acoustic Society of America, 107(1), 392–403CrossRefGoogle Scholar
  14. 14.
    Van Trees, H., & Firm, K. (2002). Optimum array processing. New York: Wiley-Interscience.CrossRefGoogle Scholar
  15. 15.
    Wang, H., & Kaveh, M. (1985). Coherent signal-subspace processing for the detection and estimation of angles of arrival of multiple wide-band sources. IEEE Transactions on Acoustics, Speech and Signal Processing, 33(4), 823–831.CrossRefGoogle Scholar
  16. 16.
    Ward, D., Ding, Z., & Kennedy, R. (1998). Broadband DOA estimation using frequency invariant beamforming. IEEE Transactions on Signal Processing, 46(5), 1463–1469.CrossRefGoogle Scholar
  17. 17.
    Gabriel, W. F. (1988). Large aperture sparse array antenna systems of moderate bandwidth for multiple emitter location. In AP symposium (pp. 238–241).Google Scholar
  18. 18.
    Williams, M., Abhayapala, T., & Kennedy, R. (2007). Generalized broadband beamforming using a modal subspace decomposition. EURASIP Journal on Applied Signal Processing, 2007(1), 9.Google Scholar
  19. 19.
    Xu, X. L., & Buckley, K. M. (1988). Reduced-dimension beam-space broad-band source localization: preprocessor design and evaluation. In Fourth annual ASSP workshop on spectrum estimation and modeling (pp. 22 –27).Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Thushara Dheemantha Abhayapala
    • 1
    Email author
  • Darren B. Ward
    • 2
  1. 1.Applied Signal Processing Group, Research School of Information Sciences and EngineeringThe Australian National UniversityCanberraAustralia
  2. 2.LondonUK

Personalised recommendations