Carrier phase estimation system using filter
CA 2113135 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Kataoka, Nobuhisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carrier phase estimation apparatus including a base band converter and a phase estimator. A received IF signal is converted to an in-phase component In and an quadrature component Qn of a digital base band signal in the base band converter. In the phase estimator, a non-linear circuit executes a non-linear operation of the components In and Qn to output non-linearly converted in-phase component In' and quadrature component Qn' of the digital base band signal and the components In' and Qn' are input to a pair of filters. In each filter the components In' or Qn' are stored into shift registers at a predetermined timing and the signals stored in the shift registers are multiplied by …
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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 January 10, 1994 and granted November 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.