APPRARATUS AND METHOD FOR SIGNAL DETECTING OF RFID SYSTEM

摘要

An apparatus and a method for restoring signals of an RFID(Radio Frequency Identification) system are provided to improve reception performance of a reader by detecting the signals applied to the reader and exactly restoring the signals by using a bit duration estimator under low signal-to-noise environment. An RF(Radio Frequency) receiver(21) performs down conversion of a received signal through a baseband. An ADC(Analog to Digital Converter)(22) converts an analog signal of the baseband into a quantized digital signal. A correlator(23) calculates correlation between the quantized digital signal and a basis. A bit duration estimator(24) estimates a bit duration for sampling by using output of the correlator. A sampling/bit data recovery unit(25) samples the output of the correlator by using the estimated bit duration and performs recovery to bit data, and a decoder(26) decodes the bit data. A response selector(28) selects a response signal having no errors among the decoded signals.