超高频RFID系统中一种可行的时间最优防碰撞算法

动态帧时隙ALOHA(DFSA)算法是一种应用广泛的防碰撞技术,主要用于解决超高频(UHF)射频识别系统(RFID)中的标签碰撞问题.在DFSA算法中,读写器需要准确估计剩余标签数并设定一个新的帧长度来识别这些标签.因此,碰撞检测(CD)和标签剩余数估计在DFSA中起着关键性的作用.现有的碰撞检测方法并不能足够有效的用于检测碰撞并导致识别性能的下降.为了减少计算量和提高识别性能,本文提出了一种有效的防碰撞算法,该算法结合了碰撞检测和待识别标签数估计方法,使得性能更加高效.理论分析和仿真结果表明,该算法的性能要优于现有的同类算法,这非常有助于设计一种快速而高效的读写器.

A FeasibIe Time-OptimaI Anti-CoIIision AIgorithm for UHF RFID Systems

Dynamic frame slotted ALOHA (DFSA) is a popular anti-collision technique to resolve a tag collision problem in ultrahigh-frequency (UHF) radio-frequency identification (RFID) systems.In DFSA, the reader needs to accurately estimate tag backlog and set a new frame size for identifying the backlog.Thus, collision detection (CD) and tag backlog estimation play important roles in DFSA.Existing CD schemes do not respond efficiently enough to detect a collision and result in a degradation of identification performance.To reduce computation load and improve identification performance, a feasible anti-collision algorithm that combines collision detection and tag backlog estimation is designed to make the performance more efficient.Theoretical analysis and simulation results show that the performance of the proposed algorithm is better than most existing anti-collision solutions.The results obtained were useful for the design of fast, efficient readers.