Distributed-input OFDM angle-of-arrival scheme for location determination

摘要

A particular first wireless device having a plurality of antennas and that is part of a group of a plurality of first wireless devices, transmits to a second wireless device (whose location is to be determined) a packet across the plurality of antennas of the particular first wireless device simultaneously with a plurality of packets transmitted by a corresponding one of other first wireless devices in the group. The packet transmitted by the particular first wireless device uses a subset of a set of subcarriers available for use in the packet such that substantially the entire set of subcarriers are used in the aggregate across the plurality of packets simultaneously transmitted by the plurality of first wireless devices in the group to the second wireless device. The simultaneous reception of the plurality of packets at the second wireless device enables the second wireless device to determine its location.

主权项

1. A method comprising:
at a particular first wireless device having a plurality of antennas and that is part of a group of a plurality of first wireless devices at respective known locations, generating a location packet to be transmitted to a second wireless device, wherein the location packet is one of a plurality of location packets enabling a second wireless device to determine a location of the second wireless device by performing angle of arrival location determination with respect to the respective known locations of the plurality of first wireless devices; determining a particular subset of subcarriers among a set of subcarriers available for use in transmitting the location packet, the particular subset of subcarriers associated with the particular first wireless device; transmitting the location packet to the second wireless device across the particular subset of subcarriers using the plurality of antennas of the particular first wireless device, wherein the location packet is transmitted simultaneously with the plurality of location packets transmitted by a corresponding one or more of other first wireless devices in the group, wherein the plurality of location packets are simultaneously transmitted within a duration of a single location packet by the plurality of first wireless devices in the group to the second wireless device using respective different subsets of subcarriers to enable the second wireless device to perform angle of arrival location determination with respect to the respective known locations of the plurality of first wireless devices in the group.