Patent Document ID: 9560073
Application ID: 14343244
Patent Flag: 1

Claim One:
1. A method of authenticating a transmitting device in a communication system using at least one multi-mode reconfigurable antenna, comprising the steps of: collecting wireless channel information for different antenna modes of said at least one reconfigurable antenna for a legitimate transmitter; combining the collected wireless channel information for different modes of said at least One reconfigurable antenna into a characteristic transmission fingerprint; forming a detection threshold based on the characteristic transmission fingerprint for the legitimate transmitter at the outset of a communication connection; comparing wireless channel information from a later transmission with said fingerprint based on a test metric to determine if the wireless channel information from the later transmission corresponds to said fingerprint within a designated threshold; and identifying the transmitter of said later transmission as an intruder if said wireless channel transmission does not correspond to said fingerprint within said designated threshold, wherein said designated threshold for a given false alarm rate is computed during a connection initialization phase of said communication connection by transmitting multiple training packets from the legitimate transmitter to a receiver and the test metric is computed between fingerprints corresponding to all of the training packets.