925MHz UHF Passive RFID System with Backscatter Diversity

• Main Authors: Jie-wei Tan, 譚介瑋
• Other Authors: Hsin-Chin Liu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/12786429913605063570

碩士 === 國立臺灣科技大學 === 電機工程系 === 100 === The multi-path fading problem causes Ultra High Frequency (UHF) Radio Frequency Identification (RFID) system performance degradation. To overcome this problem, a 925MHz RFID system with backscatter diversity that complies with Taiwan regulations is proposed in this thesis. The proposed system is composed of RFID tag with backscatter diversity and its corresponding reader. In the forward (Reader to tag) link, the RFID tag uses selective combining technique to improve its performance. In the reverse (Tag to reader) link, the tag backscatters space-time block coded signals, and the reader uses maximum ratio combining technique to obtain diversity gain to mitigate the multi-path fading problem. In addition, considering the complexity limit of the software defined radio platform that used in this thesis, a reader with new design, which has higher tag read rate than its preceding design, is proposed.