A method and a device for maintaining the performance quality of a code-division multiple access system in the presence of narrow band interference
CA 2260653 C · Owner: Jagger, Charles E. · Inventors: Jagger, Charles E.; Willetts, Mark N.; Tobia, Micolino
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A method and device which dynamically detects tracks and filters interfering signals with sufficient speed (i.e. within one IS-95 CDMA data frame period or 20ms) and fidelity to eliminate or greatly reduce the deleterious effects of narrow band interferon signals on a CDMA link. When inserted in an RF signal path an Adaptive Notch Filter (ANF) detects narrow band interferors above a threshold level within the CDMA signal. Detection is accomplished by continuous scanning of a preset excision band e.g. a specified narrow band associated with an AMPS system. Detected interferors are then automatically acquired and suppressed. This is achieved by electronically placing a rejection notch at the …
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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 February 2, 1999 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.