Revisting Tag Collision Problem in RFID Systems
In RFID systems, the reader is unable to discriminate concurrently reported IDs of tags from the overlapped signals, and a collision happens. Many algorithms for anti-collision are proposed to improve the throughput and reduce the latency for tag identification. Existing anti-collision algorithms mainly employ CRC based collision detection functions for determining whether the collision happens. Generating CRC codes, however, requires complicated computations for both RF tags and readers, and hence incurs non-trivial time consumption, becoming the bottleneck.