Carrier recovery for digitally phase modulated signals, using a known sequence
CA 2224992 C · Owner: Kreindeline, Vitali · Inventors: Trofimov, Iouri; Chloma, Alexandre; Bakouline, Mikhail
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of carrier recovery in a wireless communications system using a known synchronization word, for example an IS-54 TDMA system operates in two stages , to produce an estimate of carrier phase. In the first stage a complex fading , factor, embodying carrier phase information is estimated from the , synchronization word in the received signal using at least square criterion. In the second stage, the carrier phase is estimated from this complex fading factor by averaging. The averaging can provide a recursive average or a moving average, or can be implemented using Kalman filtering which also provides an estimated amplitude factor and frequency shift. The method and apparatus …
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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 June 26, 1996 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2018.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.