Patent ID: 11922257
Assignee: INSTITUTE OF MICROELECTRONICS, CHINESE ACADEMY OF SCIENCES
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 3:
4. A signal processing method applied to an RFID reader, comprising:
receiving a radio frequency (RF) signal from an RFID electronic tag, wherein the RF signal is a signal obtained by performing encoding, PSK modulation and OFDM modulation in turn on a digital baseband signal by the RFID electronic tag;
performing an OFDM demodulation on the RF signal to obtain a first demodulated signal;
performing a PSK demodulation on the first demodulated signal to obtain a second demodulated signal; and
decoding the second demodulated signal to obtain the digital baseband signal;
wherein the performing the OFDM demodulation on the RF signal comprises:
removing a cyclic prefix in the RF signal to obtain a third serial signal;
performing a serial-to-parallel conversion on the third serial signal to obtain N third parallel signals;
performing discrete fast Fourier transform (DFFT) on the N third parallel signals to obtain N fourth parallel signals;
performing parallel-to-serial conversion on the N fourth parallel signals to obtain a fourth serial signal; and
performing channel estimation on the fourth serial signal to obtain a first demodulated signal.