标题：An algorithm to calculate phase and amplitude of tag on RFID protocol conformance test system
作者：Wang, Na; Xu, Ying; Zhang, Yajun; Liu, Meng; Shen, Daxue; Wang, Hongjun
作者机构：[Wang, Na; Xu, Ying; Zhang, Yajun; Liu, Meng; Shen, Daxue; Wang, Hongjun] Shandong Univ, Sch Informat Sci & Technol, Jinan 250100, Shandong, Peoples R 更多
会议名称：20th International Conference on Advanced Communication Technology (ICACT)
会议日期：FEB 11-14, 2018
来源：2018 20TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY (ICACT)
关键词：RFID system; tag phase; tag amplitude; CFO; piecewise linear fitting;; segmentation
摘要：Either tag amplitude or tag phase is important factor in RFID indoor location system, so it is vital to get the correct amplitude and phase of tags. This paper propose an algorithm solving carrier frequency offset (CFO) caused by that signal generator and receiving is different and carrier frequency drift based on Radio Frequency Identification (RFID) protocol conformance test system and RFID signal analysis system. We find the change of signal with statistical idea and use piecewise linear fitting to solve how to correct every signal. The difficulty is how to pinpoint the location where rate of change changes and how to locate the start and the end of signal. We use rate of change of tag phase and I-tag signal and Q-tag signal and tag amplitude to separate tag signal to correct it and get correct signal, and then we can use cluster to get the points of IQ-signal to calculate tag phase and amplitude. This algorithm has been used in our RFID protocol conformance test system and RFID signal analysis system.