Walsh threshold matched-filtering based anti-collision for surface acoustic wave tags |
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Authors: | Qing-liang Li Xiao-jun Ji Tao Han Wen-kang Shi |
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Institution: | Department of Instrument Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract: | Surface acoustic wave (SAW) tags are truly passive devices and do not contain any intelligence, so the question of multiple
read in the reading range comes up. The paper suggests a Walsh matched-filtering method in Walsh field to distinguish the
collision tags with a threshold. In advance, the code states with special sequency are selected from large possible states
and the sequency variables of these tags are saved in a database. When a few tags are read simultaneously in read range, the
received signal is filtered by the known sequency of single tag in database, and then these tags can be distinguished by the
filtered result. Proper threshold selection improves operation speed. Experiment proves that this method is useful and reliable. |
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Keywords: | surface acoustic wave (SAW) tag Walsh matched filtering multiple access |
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