18038194. ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFICIENTS simplified abstract (Nippon Telegraph and Telephone Corporation)

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ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFICIENTS

Organization Name

Nippon Telegraph and Telephone Corporation

Inventor(s)

Etsushi Yamazaki of Musashino-shi (JP)

Seiji Okamoto of Musashino-shi (JP)

Masanori Nakamura of Musashino-shi (JP)

Kengo Horikoshi of Musashino-shi (JP)

Takeo Sasai of Musashino-shi (JP)

Yoshiaki Kisaka of Musashino-shi (JP)

ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFICIENTS - A simplified explanation of the abstract

This abstract first appeared for US patent application 18038194 titled 'ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFICIENTS

Simplified Explanation

The present invention is an adaptive equalization filter for an optical transmission system. It includes 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 using feedback control with the gradient method. The post-stage coefficient computation unit obtains the filter coefficient of the post-stage filter using feedforward control. The convolution computation unit obtains the filter coefficient of the main signal filter by performing a convolution computation of the filter coefficients of the pre-stage and post-stage filters.

  • The invention is an adaptive equalization filter for optical transmission systems.
  • It includes a main signal filter and a coefficient computation unit.
  • The pre-stage and post-stage filters receive a sample of the main signal as input.
  • The pre-stage coefficient computation unit uses feedback control with the gradient method to obtain the filter coefficient of the pre-stage filter.
  • The post-stage coefficient computation unit uses feedforward control to obtain the filter coefficient of the post-stage filter.
  • The convolution computation unit performs a convolution computation of the filter coefficients of the pre-stage and post-stage filters to obtain the filter coefficient of the main signal filter.

Potential Applications

  • Optical transmission systems
  • Communication networks
  • Fiber optic communication

Problems Solved

  • Improves the performance of optical transmission systems by equalizing the received signals.
  • Reduces distortion and noise in the transmitted signals.
  • Enhances the quality and reliability of communication networks.

Benefits

  • Adaptive equalization for optimal signal transmission.
  • Real-time updates of filter coefficients for improved performance.
  • Efficient and effective equalization of received signals.
  • Enhanced signal quality and reliability in optical transmission systems.


Original Abstract Submitted

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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