Partial control for wide-band interference suppression using eigen approach

Null Steering with Element Failures Using Partial Controlled Linear Arrays

“…Also, it was shown that controlling the edge elements is an efficient and yet simple technique for multiple sectors suppression in terms of reducing the required controllers while maintaining the mainbeam and the SLL of the approximated pattern very close to the original pattern (Mismar & Ismail, 1998). In this work, the coefficients of the nondefective edge elements are re-optimized to approximate the desired pattern with element failures.…”

“…When the number of array elements is too large, then controlling the weights of all the elements is expensive and complex. However, controlling only a few weights of elements, partial controlled arrays, will reduce the cost and complexity (Morgan, 1978;Mismar & Ismail, 1998.…”

Pattern Nulling By Iterative Phase Perturbation

“…When the number of interfering sources are much smaller than the number of antenna elements (I N ), a partially controlled array is preferred. A partially controlled array for interference suppression means that only part of the elements weights are controlled [8][9][10]. It is shown that the edge elements of a uniformly excited array are ideal for cancellation of specific sidelobes of the pattern [10,13].…”

“…A partially controlled array for interference suppression means that only part of the elements weights are controlled [8][9][10]. It is shown that the edge elements of a uniformly excited array are ideal for cancellation of specific sidelobes of the pattern [10,13]. Let the first and the last P elements are used to create I wide suppressed sectors in the array pattern at the directions of the interference sources by controlling the corresponding current phases only.…”

“…Thus, the full phase-only nulling method presents a problem for large arrays because of the potentially significant high cost of high-resolution phase shifters. The use of partial control for synthesizing low-sidelobe array patterns will lead to a significant reduction in the number of variable attenuators and phase shifters as compared to the full control implementation [8][9][10]. By partially controlling the antenna elements to suppress prescribed sectors in jammers direction, the phase perturbations of the phase shifters will be relatively large which contradicts the small phase perturbations assumption.…”