Adaptive Nulling with Weight Constraints

Adaptive nulling algorithms that minimize the total array output power from the array require constraints on the adaptive weights, otherwise nulls would be placed in the main beam and the desired signal rejected. The concept of cancellation patterns is reviewed and extended to partial adaptive nulling. Cancellation patterns are then extracted from adaptive nulling results with a genetic algorithm and a 32 element dipole array model. The cancellation patterns provide insight into the constraints needed for the successful implementation of a power minimization adaptive algorithm.