Abstract :
In the adaptive beamforming methodology used in the signal processing community, typically the adaptive weights are connected to each one of the antenna elements in the array and the processing information is generated over time, as the correlation matrix of the data needs to be formed. In the electromagnetic community however, the procedure is to carry out beam forming. However, in a system implementation, the practical requirements are quite different for these two disjoint theoretical philosophies, as in a real system the objective is to extract the signal of interest out of interferers, clutter, jammers and on. What makes the problem interesting and the classical solution methodologies not relevant in practice, as illustrated by the non-existence of a real system after fifty years of the discovery the adaptive methodologies, is because it is not only necessary to cancel the interferers and extract the signal of interest when they are located by less than a beam width of the array, but also, the direction of the arrival of the interferers are not known a priori as it is a part of the solution process itself and therefore beam forming has little use! In addition there can be blinking jammers which make a temporal implementation of the adaptive methodology not meaningful.
