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A broadband adaptive beamforming approach based on the concept of signal-subspace aligrunent is formulated and contrasted with the conventional approach. The proposed method involves a preprocessor that focuses the signal spaces at dirrerent 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 decorrelalion of coherent signals thus combating signal cancellation. The latter erreel is studied by deriving expressions for the desired-signal distortion In a minimum variance distortiouless response (MVDR) beamformer and analyzing them. 11I1Jlementation issues of the preprocessor are addressed. Simulation resulls confirm the utility of the focusin g preprocessor.

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