METHOD AND APPARATUS OF A RFID READER DEMODULATOR IN A PASSIVE RFID ENVIRONMENT

摘要

This invention relates to an RFID reader device and method for demodulating a received signal in subcarriers passive RFID environment . That is, the present invention is to extract tag information by a sub-carrier demodulation scheme with respect to the digital DC offset subcarriers tag signal distorted by the noise distortion that can be caused by the energy transmission (TX CW) component , DC offset noise is present in passive RFID environment by receiving the DC sub-carrier signal having a frequency component to remove the DC offset and noise effectively , it is possible to detect the tag information via the digital demodulation subcarriers .