射频识别系统中的防碰撞算法设计

为了防止射频识别（RFID）系统中多个应答器同时向阅读器发送识别信息时产生的碰撞问题，提出了一种新的算法——基于序列号对时隙数运算的排序算法。该算法通过应答器序列号对争用周期时隙数的运算结果，获得应答器在争用帧内相应时隙的发送位，从而利用填充过的争用帧来确定各个应答器在整个数据发送周期内的发送顺序，给不同的应答器分配不同的发送时序。计算机仿真表明,该算法可以有效解决射频识别系统中多目标识别的防碰撞问题，且适用于应答器数目较多的场合。

The Design of Anti-Collision Algorithm in RFID System

In order to avoid signal collision occurs when more than one transponder send the recognition information to the reader with function of radio frequency identification(RFID),a compositor algorithm based on identification(ID)operating to timeslot number is proposed.The sent bits will be obtained in corresponding timeslots of the competitive frame for all transponders when used the algorithm by operating result of transponders' identifications to the timeslot number of competitive frame.So it can confirm the sending order of all transponders in the whole data-sending period by the filled com-(petitive) frame and distribute different sending orders to different transponders.The computer simulation shows that the new algorithm is more effective to solve the problem of anti-collision for multi-(target) recognition in RFID system compared with other existed anti-collision algorithms.