A method, system, and apparatus for interrogating a radio frequency identification (RFID) tag population are described. Tags are interrogated by a reader. The reader and tags engage in communication according to communications algorithms, where data symbols are exchanged between the reader and tags....http://www.google.com/patents/US20060061474?utm_source=gb-gplus-sharePatent US20060061474 - Method, system, and apparatus for communications in a RFID system
