Title:
ADAPTIVE OBLIVION COEFFICIENT CONTROL ADAPTIVE FILTER AND OBLIVION COEFFICIENT ADAPTIVE CONTROL METHOD
Document Type and Number:
Japanese Patent JP3707443
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To minimize average errors in self-multiplication by adaptively control ling an oblivion coefficient, in identification of an unknown system for changes in non-stationary state, in an adaptive filter, using the least-squares algorithm sequentially.
SOLUTION: An oblivion coefficient is adaptively controlled by updating it, using a gradient concerned with the oblivion coefficient of an error signal. The specific update equation for the oblivion coefficient becomes: λ(n)=1-λc(n); λc(n+1)=λc(n)+ρGe(n+1)e(n)aT(n+1)g(n)/λc(n) Here, λc(n) is the complement of the oblivion coefficient λ(n) at the time n, ρG is the coefficient of adaptive control, e(n) is an error signal, a(n+1) is the vector of a reference input signal, and g(n) is Kalman's gain.
Inventors:
Shinichi Koike
Application Number:
JP2002092732A
Publication Date:
October 19, 2005
Filing Date:
March 28, 2002
Export Citation:
Assignee:
NEC
International Classes:
H03H21/00; H04L25/03; (IPC1-7): H03H21/00
Domestic Patent References:
| JP10508383A | ||||
| JP9139696A |
Attorney, Agent or Firm:
Takao Maruyama