An RFID system and method utilizes the power level of messages received from an RFID device for monitoring and/or locating and/or tracking the RFID device, e.g., and typically an object associated with the RFID device. The power level of received messages may be indicated by power level information contained...http://www.google.fr/patents/US7839289?utm_source=gb-gplus-shareBrevet US7839289 - Object monitoring, locating, and tracking system and method employing RFID devices
Object monitoring, locating, and tracking system and method employing RFID ...
