捕获效应下的标签估计算法

Tag Number Estimation Algorithm with Capture Effect

传统的标签估计通常要统计标签和阅读器通信中的碰撞时隙和单标签时隙的个数.然而在实际通信过程中,由于捕获效应的存在,较强信号通常会抑制掉较弱信号.这就造成了实际统计情况与事实不符的现象,进而影响标签的正确估计.由于空时隙中没有标签响应,采用统计空时隙数进行标签估计不受捕获效应影响.仿真结果表明,统计空时隙的标签估计算法在捕获效应情况下,估计精度没有变化,同时对帧时隙大小不敏感,优于其他基于统计单标签时隙数和碰撞时隙数来进行标签估计的算法.

The conventional tag number estimation algorithms usually count the number of the single tag slots and colli-sion slots during the interrogation between the reader and tags.But the capture effect,which means the complete suppression of a weak signal in presence of a strong signal at the receiver, leads to incorrect counting results. It impacts the accuracy of the tag number estimation. Tag number estimation algorithm by counting the empty slots is not influenced by the capture effect be-cause there is no tag responds in the empty slots. The simulation results show that the method based on counting the empty slots is not affected by the capture effect,which is also not sensitive to the frame size of the slots, and outperforms other algo-rithms based on counting single tag and collision slots.