針對符合ISO/IEC 18000-6B標(biāo)準(zhǔn)的UHF RFID讀寫器需要高效地解碼FM0編碼的基帶信號，從而高效地識別標(biāo)簽返回信息的要求，提出了利用高速MCU分段多次同步、多次采樣并結(jié)合IQ正交信號復(fù)合校驗的解碼方法對四通道零中頻接收機解調(diào)出來的FM0基帶信號進行解碼。通過實驗表明，該方法提高了UHF RFID讀寫器解碼FM0信號的效率，在10 m的讀卡距離下，解碼標(biāo)簽信息的誤碼率小于0.5%。

　　Abstract:

　　Aiming at the requirement of efficient decoding FM0 encoded baseband signal from the UHF RFID reader which complied with ISO/IEC 18000-6B standard ，the article introduced a new method which utilized sub-multiple synchronous and combination checking of multiple sampling and composite IQ quadrature-signal by high-speed MCU. Testing result shows the decoded bit error rate of label information less than 0.5% when the reading distance is 10 meters. A RFID tags decoding method with high accuracy and strong practicability was achieved.

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