ALOHA-Based Anti-Collision Algorithms Used in RFID System

Collision is a familiar problem and one of the largest disadvantages in RFID system. There are always two methods to deal with the collision problems. One is the deterministic collision resolution and the other is the stochastic collision resolution. The ALOHA-based anti-collision algorithms belong to the latter. In this paper, the ALOHA-based anti-collision algorithms are introduced and summarized. The most important is that two Tag estimation methods which are necessary to the DFSA algorithm (dynamic framed slotted ALOHA algorithm) are investigated using the conventional ternary feedback model. How to use these two Tag estimation methods is also analyzed