Numerically stable RLS algorithms for time-varying signals

One reason that recursive least-squares (RLS) algorithms are not used as wi dely as LMS algorithms is an instability problem resulting from finite prec ision errors in the calculations; leaky LMS algorithms that are numerically stable have been proposed in the LMS literature. in this paper, we offer a new RLS criterion that includes a strong parameter energy factor. Experime nts show that adaptive algorithms that meet this criterion are numerically more stable than conventional RLS algorithms. (C) 1999 Scripta Technica, El ectron Comm Jpn Pt 3, 82(4): 26-37, 1999.