Single-Antenna Coherent Detection of Collided FM0 RFID Signals
Single-Antenna Coherent Detection of Collided FM0 RFID Signals
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DOI：
10.1109/tcomm.2011.020612.110212
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发表时间：
2012-03-01
影响因子：
8.3
通讯作者：
Karystinos, George N.
中科院分区：
文献类型：
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作者：
Bletsas, Aggelos;Kimionis, John;Karystinos, George N.
这项工作推导并评估了碰撞射频识别 (RFID) 信号的单天线检测方案，即遵循 FM0（双相空间）编码同时传输两个 RFID 标签。与现有技术形成鲜明对比的是，所提出的检测算法明确地考虑了FM0编码特性，包括其固有的存储器。当考虑两个标签之一或仅考虑两个标签之一的错误时，得出检测算法。结果表明，与无记忆对应物相比，一位记忆双标签检测的精心设计可以将误码率 (BER) 性能提高 3dB，与单标签检测的现有技术相当。此外，这项工作还计算了总标签数量库存延迟，即与传统的单标签方法相比，使用双标签检测时节省了多少时间。研究发现，对于基本框架 Aloha 访问方案，双标签检测可以显着减少库存时间（在某些情况下减少 40% 左右）。通过模拟验证了库存时间的解析计算。这项工作可以增强现有商用 RFID 读取器（包括单天线便携式版本）的检测软件，而无需对其 RF 前端进行重大修改。
This work derives and evaluates single-antenna detection schemes for collided radio frequency identification (RFID) signals, i.e. simultaneous transmission of two RFID tags, following FM0 (biphase-space) encoding. In sharp contrast to prior art, the proposed detection algorithms take explicitly into account the FM0 encoding characteristics, including its inherent memory. The detection algorithms are derived when error at either or only one out of two tags is considered. It is shown that careful design of one-bit-memory two-tag detection can improve bit-error-rate (BER) performance by 3dB, compared to its memoryless counterpart, on par with existing art for single-tag detection. Furthermore, this work calculates the total tag population inventory delay, i.e. how much time is saved when two-tag detection is utilized, as opposed to conventional, single-tag methods. It is found that two-tag detection could lead to significant inventory time reduction (in some cases on the order of 40%) for basic framed-Aloha access schemes. Analytic calculation of inventory time is confirmed by simulation. This work could augment detection software of existing commercial RFID readers, including single-antenna portable versions, without major modification of their RF front ends.