Receiver with frequency offset correcting function
CA 2251921 C · Owner: Murakami, Keishi · Inventors: Nagayasu, Takayuki; Murakami, Keishi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A receiver with frequency offset correcting function corrects distortion caused by interference between codes and a frequency offset in received signals. In order to correct the distorsion a frequency offset correcting , circuit (21) corrects the received signals based on an estimated frequency offset value. A first CIR estimating circuit (22) finds an estimated CIR value at a first position based on an already known training sequence in the corrected received signals. A second estimating circuit (24) finds another estimated CIR value at a second position which is different from the first position by updating the estimated CIR value at the first position as an initial value in …
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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 March 4, 1997 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2019.
- 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.