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US 10,761,177 B2Granted
Angle of arrival location sensing with antenna array
AssigneeCisco Technology, Inc.
InventorsBrian Donald Hart, Paul J. Stager, Santosh Pandey, David Kloper, Dan Lyons, Matthew A. Sliverman
Life of this patent
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Abstract
In one embodiment, an apparatus includes a processor for processing a plurality of radio frequency chains at a wireless device in a block based modulation environment, recording subcarrier phases and differences between the subcarrier phases, and using the subcarrier phase differences to construct a feature vector for use in angle of arrival calculated positioning of a mobile device, and memory for storing the subcarrier phases and the feature vector.
Claims16
An apparatus comprising:
- a plurality of antennas;
- a transmitter in communication with said plurality of antennas for transmitting one or more packets in a block based modulation environment to a mobile device for use in calculating angle of arrival for location sensing at the mobile device;
- and
- a switch interposed between the transmitter and at least two of said plurality of antennas, for switching between said antennas during transmittal of said one or more packets;
- wherein the transmitter is configured for transmitting an aggregate media access control protocol data unit (MPDU) comprising metadata in at least one MPDU followed by at least one other MPDU to the mobile device, wherein the metadata is configured for use by the mobile device in calculating its location, and wherein the transmitter switches through said antennas during transmittal of said other MPDU.
2 more elements
Dependencies are inferred from the claim text.