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

Claim 0:
1. A signal processing method applied to an RFID electronic tag, comprising:
encoding a digital baseband signal to obtain a coded signal;
performing a phase shift keying (PSK) modulation on the coded signal to obtain a first modulated signal;
performing an orthogonal frequency division multiplexing (OFDM) modulation on the first modulated signal to obtain a second modulated signal; and
sending the second modulated signal to an RFID reader, by means of which an OFDM demodulation, PSK demodulation and decoding are performed in turn on the second modulated signal;
wherein the performing the OFDM modulation on the first modulated signal comprises:
inserting pilots to the first modulated signal to obtain a first serial signal;
performing a serial-to-parallel conversion on the first serial signal to obtain N first parallel signals, N being the number of subcarriers;
performing an inverse discrete fast Fourier transform (IDFFT) on the N first parallel signals to obtain N second parallel signals;
performing a parallel-to-serial conversion on the N second parallel signals to obtain a second serial signal; and
adding cyclic prefixes to the second serial signal to obtain the second modulated signal.