Method and apparatus of estimating data sequence transmitted using viterbi algorithm
CA 2067669 C · Owner: Nec Corporation · Inventors: Ushirokawa, Akihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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To reduce the number of operations required for estimating a transmitted data sequence using a Viterbi algorithm, a method and apparatus are provided for (a) storing, at predetermined time intervals a plurality of, sampled values of an incoming signal in a shift register; (b) receiving a plurality of the sampled values from said shift register, and estimating channel responses at a current time, point, of a plurality of signal sequences which are derived from said plurality of sampled values, each length of the signal sequences being reduced by deleting at least one sampled data; (c) receiving the channel responses estimated at step (b) and checking to determine if each of the estimated …
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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 30, 1992 and granted October 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2014.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.