An analysis of several partially adaptive beamformer designs

A general analysis of broadband interference cancellation in adaptive beamformers is provided. The results are then used to analyze beam, eigenstructure, and power-minimization approaches to the design of linearly constrained partially adaptive beamformers. It is shown that although beam-based designs are capable of good performance in narrowband environments, they are not appropriate for broadband environments. Eigenstructure-based designs are capable of excellent performance in narrow- or broadband environments. However, performance degrades if the number of adaptive weights is less than the eigenstructure dimension. Power-minimization designs are based on directly minimizing interference output power. Simulations indicate that the power-minimization design is capable of the best cancellation performance with a limited number of adaptive weights