RFID系统实时高效ALOHA防冲突算法研究与仿真

摘要

In this paper, the primary thoughts and performance of some radio frequency identification ALOHA anti-collision algorithms are introduced concisely which are widely used currently. And then, the essential theory of dynamic frame slot ALOHA algorithm(DFSA) which estimates the number of the tags in the valid area of the reader indirectly and the frame size adjusting method are discussed in detail. It is also analyzed statistically for estimating the number of residual tags which are frequently adopted in the dynamic frame slot ALOHA algorithm. Finally, all the algorithms are simulated based on MatLab and the results indicate that DFSA algorithm estimating the number of residual tags indirectly can have the RFID system keep higher efficiency and identify the tags accurately in real-time.%简要介绍了当前几种主要的ALOHA算法基本思想和系统效能,详细讨论了间接估算自适应帧时隙(DFSA)算法的原理和帧长度调整方法,并就DFSA算法对未识读标签的估计方法进行了统计分析,最后基于MatLab对各种算法性能进行了仿真.结果表明,间接估算DFSA算法较其它算法更能使RFID系统保持较高的系统效率,能够实时准确地识别标签.