RFID技術早已應用於諸多領域中，悠遊卡即為根據ISO 14443 Type A規範下的應用之一，其所使用的頻段為高頻(HF)，並藉由讀取器與標籤天線之間的互感效應來傳送訊號；在日常生活中隨處可見悠遊卡的使用，因此為了使此技術能更加便利的使用，查驗訊號品質的流程與技術是非常值得考量的一部分。為了達到
此目的，便需要有完整且具理論分析的模擬系統，透過此模擬系統來分析當讀取器與卡片在通訊時改變不同的參數對其效能的影響。

本論文實現之模擬系統使用美商國家儀器公司(National Instrument, NI)所開發之向量收發器(Vector Signal Transceiver, VST)實現可解讀ISO 14443 Type A讀取器以及標籤訊號之讀取器、卡片模擬器。讀取器、卡片模擬器均可控制發射端之功率、載波頻率以及各段指令的回傳延遲時間等參數，以驗證各參數對通訊的影響；而基頻訊號處理的部分主要撰寫於FPGA上，藉此實現即時(real time)的模擬系統，HOST部分則負責顯示接收到的波形以及訊號處理的結果

RFID technology has long been used in many areas recently. Easycard based on the ISO 14443 Type A protocol is one of the applications. ISO 14443 Type A RFID technology uses high frequency and mutual inductance between the reader antenna and tag antenna to transmit signal. We can see the use of easycard everywhere in our daily life, in order to use the technology more conveniently, it is important to consider how to measure the quality of communication between reader and tag. Thus, we need to design a system to simulate both reader and tag behaviors, so we can change different parameters and analyze how they affect the system performance.

In this work, we used National Instrument’s Vector Signal Transceiver (VST) to implement an ISO 14443 Type A tag and reader emulator system. The emulator system can control its output power, carrier frequency and frame delay time between each command to verify the impact of these parameters. In which the baseband signal processing is implemented in FPGA so that the system can be a real time system; meanwhile, the received waveform and decoded results are shown by an industrial PC.

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