Tcm scheme with fractional bit rates, framing signals and constellation shaping
CA 2106844 C · Owner: Brownlie, John David · Inventors: Brownlie, John David; Williams, Richard Guy Carrington
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Data are transmitted using quadrature amplitude modulation to select for transmission symbols from two (or more) different signal point constellations; constellation switching being used to facilitate transmission of a non-integral average number of bits per symbol and/or frame synchronisation. Trellis shaping (where redundancy is introduced and selection of constellation "regions" performed (206) over a number of symbols so as to minimise transmitted power) is employed; switching (205,209) is provided so that power information (from stores (207 208)) is available appropriate to the constellation in use for each respective symbol. Synchronisation may alternatively be provided by …
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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 27, 1992 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2014.
- 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.