Patent ID: 8773243

Claim:
A method for activating an RFID tag, the method comprising: receiving a frame synchronization flag and an activation command from an RFID reader at an RFID tag; and determining a validity of the frame synchronization flag using a pseudo-random sequence correlator on the RFID tag; and processing the activation command when the validity of the frame synchronization flag is determined to be valid, wherein the RFID tag activation command awakens the RFID tag from a lower power hibernate mode to a relatively higher power normal mode; wherein the frame synchronization flag is a pseudo-random bit sequence, and wherein the activation command is prepended with the frame synchronization flag; wherein the activation command comprises: a 7-bit dynamic range adjustment and automatic gain control sequence; a 14-bit AC Coupling Training, reference acquisition and bit synchronization sequence; a 15-bit frame marker and activation flag sequence; and a 2-bit timing adjust and start up delay sequence.