Method and apparatus for passive radio frequency indentification (rfid) reader digital demodulation for manchester subcarrier signal
OwnerJi Hoon BAE, Dong Han LEEinventors
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Abstract
An apparatus and method for passive radio frequency identification (RFID) reader digital demodulation with respect to a Manchester subcarrier signal are disclosed. In a passive RFID environment where the Manchester subcarrier signal contains DC components in a frequency region, even when a tag signal containing the DC offset noise is input to a baseband, demodulation may be efficiently performed while the DC offset noise is removed. Therefore, accurate detection of tag information from the tag signal may be achieved.
Claims20
A radio frequency identification (RFID) reader digital demodulation apparatus comprising:
- a subcarrier digital demodulator to receive a tag signal containing tag information regarding an object attached with an RFID tag, to remove a rectangular pulse within a first half-period of a symbol contained in the received tag signal, and to remove a subcarrier cycle within a second half-period;
- and
- a direct current (DC) offset remover to remove DC offset noise from the tag signal from which the subcarrier cycle is removed, using a matched filter.
A radio frequency identification (RFID) reader digital demodulation method comprising:
- receiving a tag signal containing tag information regarding an object attached with an RFID tag;
- removing a rectangular pulse within a first half-period of a symbol contained in the received tag signal;
- removing a subcarrier cycle within a second half-period;
- and
- removing DC offset noise from the tag signal from which the subcarrier cycle and the rectangular pulse are removed, using a matched filter.
A radio frequency identification (RFID) reader digital demodulation apparatus generating a baseband signal from which a subcarrier cycle is removed, using a subcarrier digital demodulator adapted to receive a tag signal containing tag information regarding an object attached with an RFID tag, to remove a rectangular pulse within a first half-period of a symbol contained in the received tag signal, and to remove the subcarrier cycle within a second half-period.
Dependencies are inferred from the claim text.