Wireless transmission method for antenna arrays, having improved resistance to fading
CA 2275520 C · Owner: Marzetta, Thomas Louis · Inventors: Marzetta, Thomas Louis; Hochwald, Bertrand M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a modulation method for wireless signal transmission. Each message that is transmitted is made up of a sequence of signals each selected , from a, constellation of L such signals L a positive integer. Each transmitted signal is, distributed spatially across a transmitting antenna array and is also , distributed in, time. Thus each signal may be represented as a TxM matrix in which each of , the, M columns represents a distinct antenna of the array and each of the T rows, represents a distinct time interval. Each entry in this matrix represents a complex, baseband voltage amplitude. Each of these signal matrices is proportional to a matrix having orthonormal columns.
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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 June 18, 1999 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.