Patent ID: 9501673
Filing Date: 2016-11-22
CPC Classification: G06K

Claim Text:
1. A method for transmitting a signal by a Radio Frequency Identification (RFID) reader, the method comprising: receiving a digital input signal; converting the digital input signal to an analog input signal; determining whether the digital input signal is an unmodulated signal or is modulated with information; when the digital input signal is modulated with information, filtering the analog input signal to produce a filtered signal and transmitting the filtered signal; and when the digital input signal is an unmodulated signal, bypassing the filtering of the analog input signal to produce an unfiltered analog input signal and transmitting the unfiltered analog input signal; wherein the digital input signal comprises an in-phase baseband component and a quadrature-phase baseband component; wherein converting the digital input signal to an analog input signal comprises converting the in-phase baseband component to an analog in-phase signal and converting the quadrature-phase baseband component to an analog quadrature-phase signal; wherein filtering the analog input signal to profuce a filtered signal and transmitting the filtered signal comprises: filtering the analog in-phase signal to produce a filtered analog in-phase signal; filtering the analog quadrature-phase signal to produce a filtered analog quadrature-phase signal; combining the filtered analog in-phase signal and the filtered analog quadrature-phase signal to produce a combined signal; and transmitting the combined signal.