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Adaptive Volterra filtering with complete lattice orthogonalization

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3 Author(s)
M. T. Ozden ; Fac. of Electr. & Electron. Eng., Istanbul Tech. Univ., Turkey ; A. H. Kayran ; E. Panayirci

The article presents a new recursive least squares (RLS) adaptive nonlinear filter, based on the Volterra series expansion. The main approach is to transform the nonlinear filtering problem into an equivalent multichannel, but linear, filtering problem. Then, the multichannel input signal is completely orthogonalized using sequential processing multichannel lattice stages. With the complete orthogonalization of the input signal, only scalar operations are required, instability problems due to matrix inversion are avoided and good numerical properties are achieved. The avoidance of matrix inversion and vector operations reduce the complexity considerably, making the filter simple, highly modular and suitable for VLSI implementations. Several experiments demonstrating the fast convergence properties of the filter are also included

Published in:

IEEE Transactions on Signal Processing  (Volume:44 ,  Issue: 8 )