UHF band passive RFID systems have been steadily adopted by industries leveraging the long range automatic identifications. For the applications which demand large number of readers to be located in a limited geographical area, the interference rejection among readers is important. The coding method, baseband or subcarrier coding, of the tag to reader communication link entails a significant influence onto the interference rejection. An introduction of subcarrier coding system among existing baseband coding systems need to be carefully done accordingly. This paper examines the frequency sharing of baseband and subcarrier coding UHF RFID system from the perspective of transmission delay using a numerical simulation. It is revealed that frequency band need to be divided in accordance with the coding method otherwise, a mixed operation fundamentally works against subcarrier coding system.
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