Method and system for removing radio frequency direct current offset in signal

A system for removing an RF DC offset in a signal, comprising:

• a receiver, configured to receive a signal carrying an RF DC offset;
• an RF DC offset canceling unit, configured to subtract a canceling DC from the signal and generate an RF DC offset residual;
• a determining unit, configured to determine whether the RF DC offset residual in the signal is zero;
• a canceling DC adjusting unit, configured to adjust the canceling DC according to the RF DC offset residual in the signal if the RF DC offset residual in the signal is not zero;
• an output unit, configured to output the signal if the RF DC offset residual in the signal is zero.

A system for removing an RF DC offset in a signal, comprising:

• a receiver, configured to receive a signal carrying an RF DC offset;
• an RF DC offset canceling unit, configured to subtract a canceling DC from the signal carrying an RF DC offset and generate an RF DC offset residual;
• a filter, configured to high-pass filter the signal carrying the DC offset residual and output the signal high-pass filtered;
• a canceling DC adjusting unit, configured to adjust the canceling DC according to the RF DC offset residual in the signal.

A system for removing an RF DC offset in a signal, comprising:

• a receiver, configured to receive a signal carrying an RF DC offset;
• an RF DC offset canceling unit, configured to subtract a canceling DC from the signal and generate an RF DC offset residual;
• a canceling DC adjusting unit, configured to adjust the canceling DC according to the RF DC offset residual in the signal if the RF DC offset in the signal is larger than a threshold;
• an output unit, configured to output the signal if the RF DC offset residual in the signal is equal to or less than the threshold.