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Walsh threshold matched-filtering based anti-collision for surface acoustic wave tags
Authors:Qing-liang Li  Xiao-jun Ji  Tao Han  Wen-kang Shi
Institution:Department of Instrument Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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.
Keywords:surface acoustic wave (SAW) tag  Walsh matched filtering  multiple access
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