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NI-CaseStudy-cs-14157

NI-CaseStudy-cs-14157 - Using NI PXI Modular Instruments...

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1/3 www.ni.com Using NI PXI Modular Instruments and LabVIEW to Build UHF RFID Development Platforms Author(s): Joel Joseph S. Marciano Jr. - University of the Philippines, Diliman N. Fernando Bautista - University of the Philippines, Diliman Leonard Bryan B. Paet - University of the Philippines, Diliman RFID is rapidly becoming the technological solution of choice for many applications such as inventory management, vehicular traffic management, real-time location services, and ubiquitous sensing networks. The emergence of these new applications demands several improvements to current RFID systems. At the University of the Philippines Diliman, we are developing and testing possible improvements on passive RFID readers and tags operating in the 860 MHz to 960 MHz UHF band conformant to the Electronic Product Code Class 1 Generation 2 (EPC C1G2) protocol. These improvements include enhancing the signal-to-noise ratio (SNR) in the communication link and extending the read range or coverage of the system (see Figure 1). To do this, we built a flexible test bed that emulates actual RFID readers and tags using NI PXI hardware and software. This LabVIEW RFID test bed serves as a platform for prototyping enhancements, which include a novel decoding technique for FM0 signals in tag-to-reader communication and merging “smart antenna” concepts with RFID readers and tags. Reader Emulation Platform The reader emulation platform simulates the operation of the transmitter and receiver sections of an EPC C1G2-compliant reader. The transmit section is composed of an NI PXIe-8108 embedded controller, an NI RF signal generator, an NI I/Q PXI-5652 PXIe-5450 waveform generator, and an NI PXIe-5611 I/Q vector modulator. The receive section, on the other hand, is an “RFID tag sniffer” that uses the NI IF transceiver. This transceiver digitizes the received signal and performs quadrature demodulation and PXIe-5641R downconversion to baseband. The system uses the onboard Xilinx field-programmable gate array (FPGA) to realize a bit slicer and an enhanced FM0 decoder. External components of the platform include an Alien ALR-9800 RFID reader and a UPM Raflatac passive RFID tag, whose communication is captured over the air and subsequently processed by the reader emulator. To control the operation of the RFID reader emulator, we wrote a LabVIEW VI. The VI gathers relevant RFID reader-to-tag input parameters such as power-up/power-down duration, preamble values, and reader command sequences. These parameters generate
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