Recursive filters for wideband adaptive arrays

This paper describes a wideband adaptive array employing a recursive transversal filter. This array is then compared to a similar wideband adaptive array employing a non-recursive transversal filter. Because of correlation between successive time samples, the recursive filter in general results in smaller error for the same complexity or less complexity for the same error. Control of the recursive filter is more complicated than for the non-recursive filter, however, because of interdependence between poles and zeros. The paper suggests two possible recursive implementations and develops an algorithm for setting and adjusting the weights.