Method and apparatus for providing time diversity
CA 2183116 C · Owner: At&T Corp. · Inventors: Weerackody, Vijitha
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method and apparatus for transmitting digital signaling, formation to a receiver using a plurality of antennas. The invention involves applying, a channel code to a digital signal producing one or more symbols. A plurality of symbol, copies is made and each copy is weighted by a distinct time varying function. Each, antenna which are located at two or more base stations transmits a signal based on one, of the weighted symbol copies. Any channel code may be used with the invention, such, as a convolutional channel code or block channel code. Weighting provided to symbol, copies may involve application of an amplitude gain phase shift, or both. The , present, …
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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 August 12, 1996 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2018.
- 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
Timeline From CIPO dates
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.