机构地区: 江苏大学计算机科学与通信工程学院
出 处: 《微计算机信息》 2006年第11Z期231-233,共3页
摘 要: RFID系统中,由于多标签引起的冲突一直是影响系统性能的大问题。ALOHA算法是运用比较普遍的一种防冲突算法,在标签数目较少的情况下,现有的ALOHA算法也有较高的效率,但是随着标签数目的急剧增加,算法时间也成指数往上增长,本文提出一种改进的ALOHA算法,在标签总数未知的情况下,动态估计标签数目,以选择合适的窗口大小,获得较高的系统效率。仿真结果表明,跟传统ALOHA算法相比,性能有明显改善。 In RFID system, one of the problems is the collision between tags, which lowers the efficiency of the system. ALOHA is a popular anti-collision algorithm. When the number of tags is small, it has well effectively. However, as the number of tag increases, the required number of slots increases rapidly. In the paper, we propose a method that estimates the number of tags and adjusts the frame size. Simulation results show that the proposed algorithm is effectively and accurately.