Spread spectrum interference canceler system and method
CA 2195534 C · Owner: Interdigital Technology Corporation · Inventors: Moshavi, Shimon; Schilling, Donald L.; Kowalski, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spread-spectrum CDMA interference canceler for reducing interference in a DS/CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators (54 64, 74), a plurality of spread-, spectrum-processing circuits (55 65, 75), subtracting circuits (150), and channel correlators (146). Using a plurality of chip-code signals generated from chip codeword signal generators (52 62, 72), the correlators (54, 64, 74) despreads the spread-spectrum CDMA signal as a plurality of despread signals. The plurality of spread-spectrum-processing circuits (55 65, 75) , uses a timed version of the plurality of chip-code signals generated from the delay devices (53, …
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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 5, 1995 and granted October 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2017.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.