Abstract
A broadband adaptive beamforming approach based on the concept of signal-subspace alignment is formulated and contrasted with the conventional approach. The proposed method involves a preprocessor that focuses the signal spaces at different frequencies to a common one and a narrowband beamformer following the preprocessor. The merits that result as a consequence are partial adaptivity due to single frequency weights and decorrelation of coherent signals thus combating signal cancellation. The latter effect is studied by deriving expressions for the desired-signal distortion in a minimum variance distortionless response (MVDR) beamformer and analyzing them. Implementation issues of the preprocessor are addressed. Simulation results confirm the utility of the focusing preprocessor.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 68-80 |
| Number of pages | 13 |
| Journal | IEEE Transactions on Aerospace and Electronic Systems |
| Volume | 30 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1994 |
Bibliographical note
Funding Information:This work was supported in part by the National Science I'oundation under Grant MIP-8813204 and by the SDIO/IST, managed by the office of Naval Research under Contract NOOO14-86-k-0410.