Timing and automatic frequency control of digital receiver using the cyclic properties of a non-linear operation
CA 2125489 C · Owner: Novatel Communications, Ltd. · Inventors: Scott, Kenneth E.; Kaube, Michael; Anvari, Kiomars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A technique for correcting the sampling time and carrier frequency error in a receiver for digitally modulated signals. Discrete-time complex-valued samples of the incoming signal are fed to a pair of non-linear operators such as correlators. The first correlator provides a signal having a first phase component related to the symbol timing error and a second phase component related to the carrier frequency error. The second correlator provides a signal having a first phase component related to the symbol timing error and a second phase component related to the negative of the carrier frequency error. The phase components are then separated and detected to extract an estimate of the symbol …
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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 December 8, 1992 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2014.
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