SYSTEM AND METHOD FOR SENSITIVITY OPTIMIZATION OF RF RECEIVER USING ADAPTIVE NULLING

摘要

The present invention provides sensitivity enhancement for a single antenna (280) RFID interrogating device by separately coupling a nulling signal formed using a portion of a transmit signal into a receiver. The phase and amplitude of nulling signal can be adjusted so that the nulling signal cancels that a reflected transmit signal from the antenna, resulting in the small backscattered signal from the distant RFID tag to be more easily detected, and improving the sensitivity of the RFID receiver.