Developing a channel impulse response by using distortion
CA 2199761 C · Owner: Lucent Technologies Inc. · Inventors: Wang, Jin-Der
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital audio broadcasting (DAB) system includes a radio-frequency (RF) receiver that develops a characterization signal representative of a respective mobile, communications channel as a precursor to estimating a channel impulse response. The, latter is used to set coefficients of an equalizer of the receiver to compensate for distortion, such as intersymbol interference. In generating the channel impulse response a Fast, Fourier Transform (FFT) of the characterization signal is performed. The resulting FFT, is then clipped such that frequency components above a predetermined upper threshold, and less than a predetermined lower threshold are set to the respective threshold values. …
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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 March 12, 1997 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.