LIU Yun-xia, YANG Guo-shi, JIA Qun. Adaptive Noise Reduction for Chaotic Signals Based on Dual-Lifting Wavelet Transform[J]. Acta Electronica Sinica, 2011, 39(1): 13-17.
LIU Yun-xia, YANG Guo-shi, JIA Qun. Adaptive Noise Reduction for Chaotic Signals Based on Dual-Lifting Wavelet Transform[J]. Acta Electronica Sinica, 2011, 39(1): 13-17.DOI:
According to different characteristics of chaotic signals and Gaussian noises
an adaptive noise reduction method is proposed based on dual-lifting wavelet.Singular spectrum analysis (SSA) and gradient decent algorithm are respectively used for the analysis of coarse approximation and detail information.The former removes smaller singular value representing noises in a greater degree
while the latter employed for the adaptive choice of wavelet coefficients further improves the positioning accuracy of signals.The chaotic signals generated by Lorenz model as well as the observed monthly series of sunspots are applied for simulation analysis
the numerical experiment results confirm that the adaptive method in this paper is effective for noise reduction of chaotic signals.