A subband-selective broadband GSC with cosine-modulated blocking matrix

Wei Liu, S. Weiss, L. Hanzo

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A novel subband-selective generalized sidelobe canceller (GSC) for partially adaptive broadband beamforming is proposed. The columns of the blocking matrix are derived from a prototype vector by cosine modulation, and the broadside constraint is incorporated by imposing zeros on the prototype vector appropriately. These columns constitute a series of bandpass filters, which select signals with specific directions of arrival and frequencies. This results in a high-pass-type bandlimited spectra of the blocking matrix outputs, which is further exploited by subband decomposition and suitably discarding the low-pass subbands prior to running independent unconstrained adaptive filters in each nonredundant subband. By these steps, the computational complexity of a GSC implementation is greatly reduced compared to fully adaptive GSC schemes, while performance is comparable or even enhanced due to subband decorrelation in both spatial and temporal domains.
Original languageEnglish
Pages (from-to)813-820
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Issue number3
Publication statusPublished - 2004


  • adaptive filters
  • array signal processing
  • band-pass filters frequency estimation
  • matrix algebra


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