A Low-Complexity Complementary Pair Affine Projection Adaptive Filter

Kwang-Hoon KIM  Young-Seok CHOI  Seong-Eun KIM  Woo-Jin SONG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E97-A   No.10   pp.2074-2078
Publication Date: 2014/10/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E97.A.2074
Type of Manuscript: LETTER
Category: Digital Signal Processing
adaptive filter,  complementary pair,  intermittent update,  affine projection (AP),  update interval,  

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We present a low-complexity complementary pair affine projection (CP-AP) adaptive filter which employs the intermittent update of the filter coefficients. To achieve both a fast convergence rate and a small residual error, we use a scheme combining fast and slow AP filters, while significantly reducing the computational complexity. By employing an evolutionary method which automatically determines the update intervals, the update frequencies of the two constituent filters are significantly decreased. Experimental results show that the proposed CP-AP adaptive filter has an advantage over conventional adaptive filters with a parallel structure in that it has a similar convergence performance with a substantial reduction in the total number of updates.