Rotationally invariant multilevel coded systems
CA 2118991 C · Owner: Wei, Lee-Fang · Inventors: Wei, Lee-Fang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotationally invariant, multilevel coded modulation scheme is provided by partitioning a constellation, such as an M-PSK or QAM constellation into , several trellis, subsets, each of which is is further partitioned into block subsets. The input bits are then, encoded to select a signal point from the constellation. A first portion of the input bits are, differentially encoded. A second portion of the input bits together with at , least one of the, differentially encoded bits are trellis encoded to select a trellis subset of the constellation. A third portion of the input bits -- excluding any differentially encoded bits -- are block, encoded to select a block subset from the selected …
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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 14, 1994 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.