Means providing novel signal structures for qcm modulation
CA 1202083 A · Owner: Motorola Information Systems Ltd./Systemes D'Information Motorola Ltee. · Inventors: Qureshi, Shahid; Forney, George D. Jr.; Lee, Chi H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A C T, QCM signals are provided to a transmission link by a device which converts groups of n binary signals each having 2n possible group values into signals representing a set of K signal points defined by Cartesian coordinate pairs where K>2n and the signal message points are located substantially at intersections on a rectangular triangular grid, where each message point corresponds to only one group value of the 2n possible values and each of the 2n possible values corresponds to at least one message point. Means are provided, responsive to said message point signals for providing a pair of coordinates of said complex signal message points.
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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 March 18, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 2003.
- 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.