Multilevel amplitude modulation and demodulation communication system
CA 1301864 C · Owner: Minowa, Morihiko · Inventors: Aono, Yoshihito; Daido, Yoshimasa; Takenaka, Sadao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital communication system using a QAM signal and a honeycomb constellation multilevel signal. The digital communication system includes a modulator (100a) having a unit (101) transforming in-phase and quadrature-phase data (D(i), D (q)) arranged in a quadrature lattice constellation into two data arranged in a honeycomb constellation, and a unit (102) amplitude-modulating the transformed data and a, demodulator (200a) for demodulating a transmitted signal output from the modulator.
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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
- Granted May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- 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.