Analysis of the Howells-Applebaum algorithm in the presence of moving interference. The use of lattice filters in adaptive array processors. Stability analysis of LMS adaptive filters. Adaptive array processors with moving interference

Four ongoing projects are briefly described. These are: (1) Analysis of the Howells-Applebaum algorithm in the presence of moving interference; (2) The use of lattice filters in adaptive array processors; (3) Stability analysis of LMS adaptive filters; and (4) Adaptive array processors with moving interference treated from the frequency-domain point of view. Conclusions are: the Howells-Applebaum algorithm is so insensitive to interference motion that it is unnecessary to consider such motion in the design; and adaptive array processors based on the frequency-domain approach have a worst performance than those based on time-domain approaches mainly because of the time lag required in the operation of the Fourier transform operation.