Method and system of locating a wireless device using received signal strengths

7-8. (canceled)

A method for locating a tag, the tag receiving beacon frame signals from a plurality n of access points (APs), each access point having a plurality p of transmit antennas, the tag and plurality of access points operative in the same frequency band, the method comprising:

• each of the access points transmitting a sequence of k beacon frames, each beacon frame transmitted in a sequence of timeslots, each of the k beacon frames transmitted using a unique beamforming matrix which is operative to adjust the transmit phase to the p antennas to form a radiation pattern which, combined with the radiation patterns of other access points, provides a unique map of an (x,y) coordinate space by signal strength during each timeslot of transmission;
• the tag operative to determine a received signal strength indication (RSSI) from at least two of the access points to determine a location of the tag in the (x,y) coordinate space.

22-23. (canceled)

A system for a tag receiver determining a tag receiver location from beacon frames received by the tag receiver, the system comprising:

• a plurality of access points, each access point transmitting a repeating sequence of beacon frames, each one of k beacon frames in a succession of k periodic timeslots, each access point having a plurality p of antennas, the plurality p of antennas coupled to a transmitter through a beamsteering matrix having k values in a succession, the beamsteering matrix modifying the transmit amplitude and phase for each antenna using a coefficient having a real and imaginary part for each of the k timeslots;
• the tag and access points operative in the same frequency band;
• the tag receiver associating a received signal strength indication (RSSI) from each of the received beacon frames, establishing a fingerprint of RSSIs for each access point and sequence of beacon frames, and finding a closest match to a location from the RSSI fingerprint.