Method and apparatus of using a bank of filters for excision of narrow band interference signal from cdma signal
CA 2281863 A1 · Owner: Rakib, Selim Shlomo · Inventors: Zarai, Yoram; Rakib, Selim Shlomo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A narrow band interference excision circuit for use in broadband digital data communication systems such as CDMA systems. The excision circuit is comprised of a, matrix of polyphase filters that divide the input signal into a plurality of narrow subbands. Each narrow subband signal is examined to determine if narrowband interference exists in, that bin. This is done preferably by taking the average of the absolute amplitude of the, signals in the bin. If a signal in a bin has an absolute amplitude which far exceeds the, average in the bin, the entire bin signal is eliminated. A bank of polyphase synthesis filters, reassembles the composite signal. An equalization circuit with an error …
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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 September 9, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 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.