Carrier regenerating device correctly operable in mobile satellite communication
CA 2029675 C · Owner: Nec Corporation · Inventors: Otani, Susumu; Iwasaki, Motoya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Supplied with an input signal into which a carrier signal is modulated at a frame period by a data signal and unique words periodically interspersed throughout the data signal, a demodulating circuit quadrature demodulates the input signal into an output signal. A cross-correlating circuit calculates a crosscorrelation coefficient between the output signal and a locally known unique word. A frame synchronizing circuit compares the cross-correlation coefficient with a predetermined threshold value and delivers an aperture when the cross-correlation coefficient is below the predetermined threshold value. A phase calculating circuit calculates phase errors between a recovered carrier signal …
Read the whole patent
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 November 9, 1990 and granted January 11, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2012.
- 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
Timeline From CIPO dates
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.