Adaptive equalization filter and method for updating filter coefficients

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12224889
APP PUB NO 20230421420A1
SERIAL NO

18038194

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Abstract

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An aspect of the present invention is an adaptive equalization filter for an optical transmission system, including: a main signal filter; and a coefficient computation unit that updates the filter coefficient of the main signal filter. The pre-stage filter and the post-stage filter receive a sample of the main signal as an input. The pre-stage coefficient computation unit obtains the filter coefficient of the pre-stage filter by feedback control using the gradient method. The post-stage coefficient computation unit obtains the filter coefficient of the post-stage filter by feedforward control. The convolution computation unit obtains the filter coefficient of the main signal filter by convolution computation of the filter coefficient of the pre-stage filter obtained by the pre-stage coefficient computation unit and the filter coefficient of the post-stage filter obtained by the post-stage coefficient computation unit.

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Patent Owner(s)

  • NEC CORPORATION AND NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Horikoshi, Kengo Musashino, JP 25 115
Kisaka, Yoshiaki Musashino, JP 65 233
Nakamura, Masanori Musashino, JP 198 1714
Okamoto, Seiji Musashino, JP 66 274
Sasai, Takeo Musashino, JP 8 3
Yamazaki, Etsushi Musashino, JP 53 376

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