PARTIALLY ADAPTIVE BEAMFORMER DESIGN SUBJECT TO WORST-CASE PERFORMANCE CONSTRAINTS

This correspondence proposes two methods for designing partially adapt ive beamformers that satisfy a performance specification over a set of likely interference scenarios. Both methods choose the adaptation spa ce in a sequential fashion; the dimension is increased one by one unti l the performance specification is attained. In the multilevel point d esign method, each dimension of the adaptation space is chosen to give optimum performance at a single interference scenario. The constraine d minimization design method chooses each dimension of the adaptation space to exactly satisfy the performance specification at a single int erference scenario while approximately minimizing the average interfer ence output power over neighboring scenarios. Simulations indicate tha t both methods result in better performance than existing methods whil e using fewer degrees of freedom.