Two-Dimensional Beamforming Using a Frequency Domain Complex Least Mean-Squares (LMS) Adaptive Filter

摘要

The complex LMS adaptive algorithm developed by Widrow is used in the frequency domain to estimate the azimuth and elevation angles of a plane wave incident upon a planar array. The complex LMS algorithm is applied to two cases. The first case is a passive detection problem. The second case is a pulse communication problem. In both cases, complex weights are determined using the complex LMS algorithm which cophase all of the output electrical signals from the planar array. Three versions of the complex LMS algorithm are studied and their performances are compared. (Author)