Multi-carrier transmission with bit rate variation in a noise environment
CA 2270774 C · Owner: Nec Corporation · Inventors: Okamura, Yusaku
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for multi-carrier transmission is provided which can secure transmission, capacity under a noise environment whose noise changes cyclically. A mapping section in an, ATU-C (ADSL transceiver unit central office end) memorizes: the bit allocation allocated to, each carrier and transmission power allocation used for each carrier during a period in which, the noise generated at the data transmission to a downstream direction is large; and the bit, allocation allocated to each carrier and transmission power allocation used for each carrier, during a period in which the noise generated at the data transmission to an upstream direction, is large. A demapping section in an ATU-R …
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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 May 4, 1999 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2021.
- 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.