Open Access

Nonlinear Effects of the LMS Adaptive Predictor for Chirped Input Signals

EURASIP Journal on Advances in Signal Processing20022002:705868

DOI: 10.1155/S1110865702000434

Received: 30 July 2001

Published: 14 January 2002

Abstract

This paper investigates the nonlinear effects of the Least Mean Square (LMS) adaptive predictor. Traditional analysis of the adaptive filter ignores the statistical dependence among successive tap-input vectors and bounds the performance of the adaptive filter by that of the finite-length Wiener filter. It is shown that the nonlinear effects make it possible for an adaptive transversal prediction filter to significantly outperform the finite-length Wiener predictor. An approach is derived to approximate the total steady-state Mean Square Error (MSE) for LMS adaptive predictors with stationary or chirped input signals. This approach shows that, while the nonlinear effect is small for the one-step LMS adaptive predictor, it increases in magnitude as the prediction distance is increased. We also show that the nonlinear effect of the LMS adaptive predictor is more significant than that of the Recursive Least Square adaptive predictor.

Keywords

adaptive filter linear prediction least mean square recursive least square tracking autoregressive model

Authors’ Affiliations

(1)
Department of Electrical and Computer Engineering, University of California
(2)
Space and NavalWarfare Center

Copyright

© Han et al. 2002