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A typical Radio frequency identification system (RFID) includes one reader and a number of tags. The reader transmit to commands to the tags with interrogation radio signals, and tags receive the command and then respond with their identification. Readers with interrogation signals can read tags' responses. In RFID systems, when multiple tags respond to one reader simultaneously, tag collision can occur. In addition, multiple reader to tag collision occurs when more than one reader wants tofatcat:44byjdg5vbchdfckzezsr2frwy