The performance of hybrid adaptive beamforming algorithm for jammers suppression

Adaptive array processing is of growing importance in the fields of communications, radar, and sonar, where the designer almost invariably faces the problem of interference suppression. In general, under some situations, the conventional Frost´s (1972) beamforming algorithm may have some problems associated with performance degradation in multiple jammers environment. It causes the convergence time to be essentially dependent on the jammer powers ratio. A new hybrid adaptive beamforming algorithm is derived in the transformed domain for multiple jammers suppression. Here, three popular orthonormal transformations-i.e., discrete Hartley, discrete cosine, and discrete Fourier transforms-are considered. Overall performance improvement, in terms of convergence rate and the computational requirement, is investigated. From the simulation results, we observed that the new presented beamforming algorithm is more robust than the conventional Frost´s beamforming algorithm in terms of jammers suppression and the convergence rate