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Self-adaptive sparse system identification method based on impact-interference-resistance of independent activity factor

A technology of active factor and system identification, applied in the field of sparse system identification, can solve the problems of slowing down the convergence speed of RP-APSA

Inactive Publication Date: 2014-11-19
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Furthermore, in RP-APSA, since the active factor assigned to each weight of the adaptive FIR filter is the same, it results in all inactive filter weights being assigned the same step length, which slows down The convergence speed of RP-APSA in the whole adaptive process

Method used

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  • Self-adaptive sparse system identification method based on impact-interference-resistance of independent activity factor
  • Self-adaptive sparse system identification method based on impact-interference-resistance of independent activity factor
  • Self-adaptive sparse system identification method based on impact-interference-resistance of independent activity factor

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Embodiment

[0040] An adaptive sparse system identification method based on independent active factors for anti-shock interference, comprising the following steps:

[0041] A. Obtain the desired signal and output signal of the filter

[0042] Send the input signal x(n) to the sparse system w o , get the sparse system w o The output signal d(n) of the adaptive FIR filter is the desired signal; at the same time, the input signal x(n) is sent to the adaptive FIR filter to obtain the output signal of the adaptive FIR filter in:

[0043] n represents the current moment, the superscript T represents the transpose operation, w(n)=[w 1 (n),w 2 (n),...,w i (n),...,w M (n)] T is the weight column vector of the adaptive FIR filter at the current moment, that is, the sparse system w o The column vector identification value at the current moment, its length is M; the value of M depends on the situation of the sparse system, the more complex the sparse system, the larger the value, usually u...

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Abstract

A self-adaptive sparse system identification method based on impact-interference-resistance of an independent activity factor mainly comprises the following steps: A, acquiring an output signal and a desired signal of a self-adaptive FIR (finite impulse response) filter; B, subtracting an output signal vector (FORMULA) from a desired signal vector d(n) to obtain an output error vector e(n) of the self-adaptive FIR filter; C, calculating a scaling factor column vector g(n) of a weight vector of the self-adaptive FIR filter; D, calculating a weight column vector w(n+1) of the self-adaptive FIR filter at the next moment; E, assigning n=n+1, repeating operations in steps A, B, C and D, namely continuously obtaining identification values w(n) of the sparse system at different moments. The impact-interference-resistant self-adaptive sparse system identification method is very fast in converging speed, strong in traceability and low in calculation complexity.

Description

technical field [0001] The invention relates to a sparse system identification method in an impact noise environment, and belongs to the technical field of digital signal processing. Background technique [0002] In recent years, with the rapid development of adaptive filter algorithm theory, adaptive filter technology has been widely and successfully applied in system identification, channel equalization, active noise control and echo cancellation (including acoustic echo cancellation, network echo cancellation and underwater echo cancellation) and other fields. Essentially, these applications are an adaptive system identification problem, that is, using an adaptive filter to identify the impulse response or transfer function of the unknown system according to the statistical properties of the input and output signals of the unknown system. For example: in speech echo cancellation, although the signal from the speaker is first sent to the adaptive filter to generate an est...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H21/00
Inventor 赵海全喻翌
Owner SOUTHWEST JIAOTONG UNIV
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