Method and apparatus for reconstructing desired signal in case of using full duplex radio (fdr) scheme

An apparatus for reconstructing a desired signal using a full duplex radio (FDR) scheme, comprising:

• a digital self-interference cancellation unit configured to output a first digital signal;
• a demodulator configured to demodulate the first digital signal;
• a modulator configured to modulate the demodulated first digital signal;
• an attenuator configured to attenuate the modulated first digital signal by applying an attenuation coefficient to the modulated first digital signal;
• and
• an operation unit configured to receive the attenuated first digital signal and the first digital signal, and transmit a residual signal to the digital self-interference cancellation unit, wherein the residual signal is obtained by subtracting the attenuated first digital signal from the first digital signal,
• wherein the digital self-interference cancellation unit is configured to:
• receive a second digital signal before digital-to-analog conversion (DAC) processing is performed in a digital to analog converter (DAC) of a transmitting end and a third digital signal obtained after analog to digital conversion (ADC) processing is performed in an analog to digital converter (ADC) of a receiving end,
• output a signal obtained after subtracting the second digital signal and the residual signal from the third digital signal.