Non-linear predistortion and upconversion system
CA 2276883 A1 · Owner: Telecommunications Research Laboratories · Inventors: Davies, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for harmonically upconverting a phase and/or amplitude modulated subcarrier signal to a higher frequency through a non-linear optical link, is disclosed. The method requires that a bandpass signal with a earner , frequency, at a submultiple of the desired radio transmission frequency be frequency, translated in a non-linear two-port device. To avoid the inherent distortion inflicted, on the information signal in harmonic upconversion a predistortion technique , is, outlined. This consists of phase compression in the case of a phase modulated signal, amplitude scaling in the case of amplitude only and combined phaseamplitude , predistortion for QAM type signals. With …
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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 July 2, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2021.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.