【作者】 郭跃； 耿淑琴； 高国； 吴武臣；

【Author】 Guo Yue Geng Shuqin Gao Guo Wu Wuchen (College of Electronic Information and Control Engineering,Beijing University of Technology,Beijing 100022,China)

【机构】 北京工业大学电子信息与控制工程学院；

【摘要】 RFID 系统广泛应用于工业自动化、商业自动化和交通运输控制管理等众多领域。当多个标签同时处于同一个通信信道时,数据碰撞致使阅读器无法正确识别标签。这是 RFID 系统的一个很严重的问题。为解决这一问题,很多 RFID 系统应用帧时隙 ALOHA 算法。帧时隙 ALOHA 算法简单易行,在较少标签数时性能很好,但随着标签数的增加,识别标签所需的时隙数会随之指数性增大因而导致系统效率下降。本文提出了一种改进的防碰撞算法,将阅读器跳频轮询技术和标签分频技术与帧时隙 ALOHA 算法相结合,降低了标签的碰撞几率,减少了识别时间,提高了识别效率。和帧时隙 ALOHA 算法相比,改进算法明显降低了所需时隙数随标签数的增加率。该算法已经成功地应用于433MHz 有源 RFID 系统,并有效的降低了标签的碰撞概率。更多还原

【Abstract】 RFID system is widely used in many fields,such as industry automation,commercial automation and traffic control system.Tag collision,causing the RFID reader can not identify the tag data,is a serious problem as several tags use the same communication channel simultaneously.Framed slotted ALOHA algo- rithm is normally used to solve the RFID collision problem.It is simple and shows good performance when the tags number is small.But it requires an exponentially increasing number of slots with the tags number increasing.An improved anti-collision algorithm is proposed in this paper,which combines the tags frequen- cies division technique,the frequency poll hopping technique to the frame slotted ALOHA algorithm.The proposed algorithm has a lower collision probability and needs fewer slots with a tag identification efficiency improved significantly.The proposed algorithm has been used in 433 MHz RFID system and reduces the tag collision probability efficiently.更多还原