多径衰落信道下射频识别系统抗干扰技术  

Anti-interference of RFID system in the multiple fading channel

作　　者：于银山[1] 俞晓磊[2] 汪东华[2] 赵志敏[1] 

机构地区：[1]南京航空航天大学理学院,江苏南京210016 [2]江苏省标准化研究院,江苏南京210029

出　　处：《太赫兹科学与电子信息学报》2013年第3期363-367,376,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：江苏省质量技术监督局科技资助项目(KJ122714);江苏省科技厅科技创新与成果转化(科技服务平台)资助项目(BM2011119);中央高校基本科研业务费专项资金资助项目(NS2012062)

摘　　要：射频识别(RFID)系统通信环境由简单近距离的室内通信向复杂远距离的都市通信发展,在读写器和电子标签之间出现了由多径效应引起的带多普勒频移的瑞利衰落。针对B类标签信号在多径瑞利衰落信道中的传输进行系统建模与分析,并将正交频分复用(OFDM)系统引入以提高RFID信号对信噪比的敏感度。仿真结果表明,标签信号在多径瑞利衰落信道中对信噪比变化不敏感,引入OFDM后信号对信噪比的敏感度明显提高,RFID系统抗干扰能力得到增强。With the communication environment of Radio Frequency Identification（RFID） system developing from near field communication to long distance communication, Rayleigh fading with Doppler frequency shift emerges due to multipath effect between the readers and electronic tags. A systemic study is focused on modeling and analysis of channel transmission for type B tag signals in the multiple Rayleigh fading channel. The OFDM system is added to the RFID tag signals to improve the sensitivity of SNR in the Rayleigh fading channel. The research results show that SNR of tag signal is not sensitive in the multipath Rayleigh fading channel. However, the sensitivity has increased after OFDM adding to the RFID system and the anti-interference ability has been highly improved.

关 键 词：射频识别系统瑞利信道 衰落 多普勒频移 正交频分复用 抗干扰 

分 类 号：TN911.4[电子电信—通信与信息系统] TP23[电子电信—信息与通信工程]