Adaptive antenna
CA 2265206 C · Owner: Speight, Timothy James · Inventors: Speight, Timothy James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Adaptive antennas are used to counter dispersion due to multipath propagation and interference from other stations using the same frequency. Each of the antennas in the array has a respective tapped delay line in which the tap output signals are weighted and summed. In a known theoretical proposal, the weights W are determined as follows:, w = R xx -1 r xd, where R xx is the autocorrelation matrix of the input to the system and r xd is the crosscorrelation vector of the input signal and the known sequence. In practice estimates of R xx and r xd may be obtained by averaging the instantaneous matrices and vectors over the training sequence. A method to provide an improved estimate of R xx is …
Read the whole patent
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 9, 1999 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 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.
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.