快速且节能的传感器仲裁：被动RFID标签的物理层冲突恢复
Fast and Power Efficient Sensor Arbitration: Physical Layer Collision Recovery of Passive RFID Tags
摘要：
这项工作涉及物理层冲突恢复便宜的传感器允许的频率和延迟的通信变化。这项工作是作为一个通用的，通信理论框架，并证明使用超高频RFID标签技术。在这方面的以前的工作没有提供超过两个标签，这是可能的，在这项工作中的恢复。还提出了一种新的数学模型的标签信号，将允许的频率和延迟的变化。主要的动机是观察到频率和延迟的随机变化使得不同标签的冲突信号可分离。冲突恢复是通过估计传感器特定的频率和延迟的变化，并在连续干扰消除算法和最大似然序列解码器中使用这些估计，以迭代地重建传感器信号并将其从接收信号中去除来完成的。数值仿真结果表明，该估计和算法是有效的恢复碰撞。所提出的算法，然后纳入UHF RFID标签的Qprotocol的数值模拟，并被证明是有效的，在提供快速和节能的传感器仲裁。
英文摘要：
This work concerns physical layer collision recovery for cheap sensors with allowed variations in frequency and delay of their communications. The work is presented as a generic, communication theoretic framework and demonstrated using UHF RFID tag technology. Previous work in this area has not provided recovery for more than two tags, which is shown to be possible in this work. Also presented is a novel mathematical model of the tag signal, incorporating the allowed variations in frequency and delay. The main motivation is seen in the observation that random variations in frequency and delay make the collided signals of different tags separable. The collision recovery is done by estimating the sensor specific variation in frequency and delay and using these estimates in a successive interference cancellation algorithm and a maximum likelihood sequence decoder, to iteratively reconstruct a sensor signal and remove it from the received signal. Numerical simulations show that the estimates and proposed algorithm are effective in recovering collisions. The proposed algorithm is then incorporated into a numerical simulation of the Qprotocol for UHF RFID tags and is shown to be effective in providing fast and power efficient sensor arbitration.
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