Title :
Applications of cumulants to array processing. III. Blind beamforming for coherent signals
Author :
Gonen, Egemen ; Mendel, Jerry M.
Author_Institution :
Globalstar LP, San Jose, CA, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
For pt.II see ibid., vol.43, no.7, p.1663-7, 1995. We provide a cumulant-based blind beamforming method for recovery of statistically independent narrowband source signals in the presence of coherent (or perfectly correlated) multipath propagation. Our method is based on the fact that for a blind beamformer, the presence of coherent multipaths is equivalent to the case of independent sources with a different steering matrix. Our approach is applicable to any array configuration having unknown response. Signal sources must have nonzero fourth-order cumulants. There is no need to estimate the directions of arrival. Our method maximizes signal-to-interference plus noise ratio (SINR). A comparable result does not exist using just second-order statistics
Keywords :
array signal processing; direction-of-arrival estimation; higher order statistics; interference (signal); interference suppression; matrix algebra; multipath channels; DOA; SINR; array configuration; array processing; blind beamforming; coherent multipath propagation; coherent signals; communication signals; cumulants; directions of arrival estimation; independent sources; nonzero fourth-order cumulants; perfectly correlated multipath propagation; second-order statistics; signal recovery; signal to interference plus noise ratio; statistically independent narrowband source signals; steering matrix; unknown response; Array signal processing; Calibration; Direction of arrival estimation; Higher order statistics; Narrowband; Sensor arrays; Signal processing; Signal to noise ratio; Source separation; Working environment noise;
Journal_Title :
Signal Processing, IEEE Transactions on
