Patent ID: 9614604
Date: 2017-04-04
CPC Classifications: G01S,G06K,H01Q,H04B

Claim:
1. An RFID system, comprising: at least one antenna array, where each antenna array comprises a plurality of antenna elements; a transmit module configured to transmit RFID tag interrogation signals to an RFID tag using antenna elements of the at least one antenna array by adjusting relative phases of the RFID tag interrogation signals using a set of beamforming coefficients; a receiver module configured to process at least one backscattered sequence of RFID tag information received by at least one antenna element from the RFID tag to form a backscattered signal and derive information from the backscattered signal; and a beamformer scheduler configured to determine a set of beamforming coefficients that modify RFID tag interrogation signals fed to each of a set of antenna elements from the at least one antenna array by searching possible combinations of coefficients to maximize the power of the beamformed output at a given spatial location of the beam target.