Doppler signal processing device and method thereof for interference suppression

A Doppler signal processing device for suppressing interference in a background according to a received wireless signal, the Doppler signal processing device comprising:

• a frequency analyzer configured to generate a frequency domain signal according to a digital signal, wherein the digital signal corresponds to the received wireless signal and comprises interference energy generated by the interference in the background;
• an interference suppressor configured to perform a suppression operation according to the frequency domain signal and a frequency domain interference estimation signal to generate an interference suppressed frequency domain signal, wherein the interference suppressed frequency domain signal is related to the frequency domain signal subtracted by the frequency domain interference estimation signal during an object detection;
• an interference baseline estimator configured to generate or update the frequency domain interference estimation signal according to the frequency domain signal, wherein the frequency domain interference estimation signal corresponds to an energy distribution of the interference in the frequency domain;
• and
• a synthesizer configured to generate an interference suppressed digital signal according to the interference suppressed frequency domain signal, wherein the interference suppressed digital signal is related to the digital signal with the interference energy suppressed.