摘 要: 目前RFID技術在各個領域中廣泛應用,且還未形成統一的全球化標準,市場為多種標準并存的局面,由于各個標準中對于調制方式的定義不同,給不同標準間的通信和檢測帶來了較大的障礙。因此,正確地識別出RFID調制方式是實現通信互聯和信號測試等處理的前提,RFID調制識別的研究逐漸成為國內外RFID測試中的研究熱點。提出一種新的基于瞬時信息的調制識別方法,該方法是以RFID調制信號的瞬時信息為基礎,提出了兩個新的特征參數Ra和Rf,設計了調制識別分類器進行有效識別。仿真結果表明,該方法的復雜度降低,且RFID調制信號的識別正確率有了很大程度的提高。
關鍵詞: RFID; 信號識別; 瞬時信息; 調制識別方法
中圖分類號: TN911?34 文獻標識碼: A 文章編號: 1004?373X(2013)24?0015?05
Research and simulation of RFID modulation signal recognition algorithm
HUANG Yu, HU Ye
(Jiangsu Institute of Standardization, Nanjing 210029, China)
Abstract: Currently, RFID technology is widely used in various fields. However, there isn’t a unified global standard and multiple standards coexist. Because the definition of modulation modes in various standards is not identical, it is difficult for the detection and the communication between diferent standards. Therefore, the correct identification of RFID modulation modes is the precondition for communication interconnection and signal processing, and the RFID modulation recognition has become a research hotspot in RFID testing area at home and abroad. A new RFID modulation recognition method based on instantaneous information is proposed in this paper, in which two new parameters (Ra and Rf) are presented on the basis of RFID modulation signal instantaneous information. A classifier of for modulation recognition was designed for effective recognition. The simulation results show that the complexity is significantly reduced by the method and the correct recognition rate of RFID modulation signal is improved to a great extent.
Keywords: RFID; signal recognition; instantaneous information; modulation recognition method
0 引 言
射頻識別技術(Radio Frequency Identification,RFID)是物聯網的核心技術,它是自動識別技術(Automatic Equipment Identification,AEI)在無線電領域的應用和發展。RFID是通過射頻信號自動識別目標并獲取數據,識別過程無須人工干預,RFID技術具有防水、防磁、使用壽命長、耐高溫、取距離大、保密性強、數據容量大等優點。
近年來,隨著RFID技術的發展,RFID技術在關系國計民生的重要領域都有廣泛應用。正確有效地識別出這些信號,從中解調出有用信息,在此方面的研究意義重大。本文提出一種新的RFID調制識別方法,主要研究的內容包括基于瞬時信息提取特征參數以及設計判決的分類器。具體步驟如下:首先是計算出信號的瞬時信息,包括瞬時幅度、瞬時頻率和瞬時相位;接著,利用上一步驟中算出的瞬時信息,提取5個特征參數;……