Walsh Threshold Matched-Filtering Based Anti-collision for Surface Acoustic Wave Tags  

作　　者：李庆亮 吉小军 韩韬 施文康 

机构地区：[1]Department of Instrument Science and Engineering,Shanghai Jiaotong University

出　　处：《Journal of Shanghai Jiaotong university(Science)》2009年第6期681-685,共5页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China (Nos. 10304012 and 50875167)

摘　　要：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.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.

关 键 词：surface acoustic wave （SAW） tag Walsh matched filtering multiple access 

分 类 号：TN65[电子电信—电路与系统] O174[理学—数学]