Intersymbol interference channel coding scheme
CA 2121757 C · Owner: American Telephone And Telegraph Company · Inventors: Laroia, Rajiv
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Intersymbol interference and precoding loss are minimized by combining the precoding and coding operations. An intersymbol interference coder uses a feedback loop to apply a dither sequence to a sequence of input signal points. The dither signal applied to each input signal point is a function of the previous signal points in the sequence. The intersymbol interference coder implements for example, a trellis coding operation by selecting one of several different modulo operations to determine the magnitude of the dither signal the selection being made in response to the current trellis state. The sequence of signal points output from the intersymbol interference coder generates a valid …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 20, 1994 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.