【作者】 司翠；

【导师】 刘乃安；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2011， 硕士

【摘要】 RFID(射频识别技术),是一种通过射频信号自动识别目标对象并获取相关数据的非接触式的自动识别技术,广泛应用于智能交通、物流管理等领域,被公认为是21世纪十大重要的技术之一。防碰撞技术是RFID系统的关键技术之一,影响RFID系统性能的重要因素,因此,对RFID系统防碰撞机制的研究有着重要的意义。目前存在的防碰撞算法仅是单一解决系统中的某一种碰撞,在大型的RFID系统中,多种碰撞共存时效率差。因此,需要一种可同时解决系统中多种碰撞的防碰撞算法。本文主要研究的是多阅读器、大量标签的有源RFID系统中的碰撞问题。论文通过对现有多种典型的防碰撞算法的分析和比较,给出了一种基于F-CDMA的RFID系统,并在其基础上提出了一种同时解决系统中标签碰撞和阅读器碰撞的防碰撞机制——FSA-F-CDMA算法,算法结合利用了TDMA、FDMA和CDMA技术,实现了大量标签与多个阅读器的同时通信。通过对算法的理论分析和性能仿真,验证了算法的可行性,并且在大量电子标签的情况下,算法的优越性更加明显。最后,对提出的防碰撞机制的应用进行了说明。更多还原

【Abstract】 RFID (Radio Frequency Identification) is a kind of non-contact auto-identification technology, which recognizes the target and gets the relative data with the use of radio frequency signal. As considered to be one of the top ten important technologies in 21st century, it has been widely applied in many areas such as intelligent transportation and logistics management. Anti-collision technology is one of the key technologies of RFID system, which is a key factor that affects the performance of RFID system, therefore, the research of the anti-collision method in RFID system is of great significance. The available anti-collision algorithms are focus on only a single kind of collision, and their efficient are low in the large RFID system, in which kinds of collisions are existed simultaneously. So, a kind of anti-collision algorithm which could solve kinds of collisions at the same time is in a great need.The collision in the active RFID system with multi-reader and large number of tags is mainly researched in this thesis. Through the analysis and comparison of many available typical anti-collision algorithms, a new kind of RFID system based on F-CDMA is given, and on its basis a new anti-collision algorithm named FSA-F-CDMA is brought forward, by which both the tag collision and reader collision in the system could be solved, and the communication of many readers and a large number of tags at the same time can be obtained with the combination of TDMA, FDMA and CDMA. The analysis and simulation are made to verify the feasibility of the proposed algorithm, and the superiority of which is more obvious in the case of a large amount of tags. Finally, the application of the proposed anti-collision mechanism is illustrated.更多还原