RFID Tag Acquisition Via Compressed Sensing: Fixed vs. Random Signature Assignment
RFID Tag Acquisition Via Compressed Sensing: Fixed vs. Random Signature Assignment
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DOI：
10.1109/twc.2015.2498922
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发表时间：
2016-03
影响因子：
10.4
通讯作者：
M. Mayer;N. Goertz
中科院分区：
文献类型：
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作者：
M. Mayer;N. Goertz
我们引入了一种利用压缩传感技术执行射频识别（RFID）的新颖方案。所提出的方案即使在低信噪比的情况下也可以快速可靠地识别多个 RFID 标签。与广泛使用的帧时隙 ALOHA (FSA) 协议相反，由阅读器激活的标签在采集阶段故意与其分配的签名同时响应；碰撞被认为是有益的而不是破坏性的。签名是从巨大的签名池中提取的，分配给激活标签的签名集与签名总数相比非常小。这给采集阶段带来了稀疏性，进而允许将采集表述为压缩传感测量。此外，我们的公式允许使用低复杂度的近似消息传递算法来进行压缩感知恢复。我们比较了 FSA 协议基于压缩感知的方法的两种实现。第一个执行固定签名分配 - 这可以非常快速地识别，但牺牲了灵活性。第二个执行随机签名分配 - 这降低了识别速度，但提供了灵活性。通过仿真进行比较表明，两种基于压缩感知的方法在识别速度和噪声鲁棒性方面均明显优于 FSA。
We introduce a novel scheme to perform radio frequency identification (RFID) with compressed sensing techniques. The proposed scheme allows quick and reliable identification of several RFID tags, even at low signal-to-noise ratio. Contrary to the widely used frame slotted ALOHA (FSA) protocol, the tags activated by a reader deliberately respond simultaneously with their assigned signature during the acquisition phase; collisions are regarded as beneficial rather than destructive. The signatures are drawn from a huge signature pool, and the set of signatures that is assigned to the activated tags is very small compared to the total signature count. This introduces sparsity to the acquisition phase which, in turn, allows formulation of the acquisition as a compressed sensing measurement. Furthermore, our formulation permits the usage of a low-complexity approximate message passing algorithm for compressed sensing recovery. We compare two realizations of the compressed sensing-based approach to the FSA protocol. The first performs fixed signature assignment - this enables very quick identification but sacrifices flexibility. The second performs random signature assignment - this reduces the identification speed but provides flexibility. A comparison via simulation shows that both compressed sensing-based approaches significantly outperform FSA in terms of identification speed and robustness to noise.