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AssigneeNippon Telegraph and Telephone Corporation
InventorsEtsushi Yamazaki, Seiji Okamoto, Masanori Nakamura, Kengo Horikoshi, Takeo Sasai, Yoshiaki Kisaka
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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.
An adaptive equalization filter for an optical transmission system, the adaptive equalization filter comprising:
A filter coefficient update method for updating a filter coefficient of a main signal filter, wherein;
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