Full division duplex system and a leakage cancellation method

A full division duplex system, comprising:

• a receiver, receiving an inbound RF signal of a first band to generate an inbound baseband signal;
• a transmitter, up converting an outbound baseband signal by an oscillation signal to generate an outbound RF signal of a second band for transmission;
• an auxiliary circuit, coupled to the receiver and transmitter, calculating leakages from the outbound RF signal to generate a blocker replica, comprising:
• a first down converter, coupled to a non-conductive coupling path extended from the receiver to receive an induction signal, and down converting the induction signal by the oscillation signal to generate a preliminary baseband signal;
• an error estimator, coupled to the first down converter, comparing the preliminary baseband signal with the outbound baseband signal to calculate a set of error parameters indicating path delay, phase imbalance and gain error of the leakages from the outbound RF signal;
• a compensator, coupled to the error estimator, compensating the outbound baseband signal by the error parameter to generate an adjusted baseband signal;
• and
• an up converter, up converting the adjusted baseband signal by the oscillation signal to generate the blocker replica;
• wherein the inbound baseband signal and the induction signal are obtained from a subtraction of the inbound RF signal and the blocker replica.

A full division duplex system operating in a calibration mode and a normal mode, comprising:

• a receiver, receiving an inbound RF signal of a first band to generate an inbound baseband signal;
• a transmitter, up converting an outbound baseband signal by an oscillation signal to generate an outbound RF signal of a second band for transmission;
• an auxiliary circuit, coupled to the receiver and transmitter, calculating leakages from the outbound RF signal to generate a blocker replica, comprising:
• a error estimator, coupled to the output of receiver, enabled only in the calibration mode to compare the outbound baseband signal with the inbound baseband signal, and thereby calculating a set of error parameters indicating path delay, phase imbalance and gain error of the leakages from the outbound RF signal;
• a compensator, coupled to the error estimator, enabled in the normal mode to compensate the outbound baseband signal based on the error parameter, and thereby generating an adjusted baseband signal;
• and
• an up converter, up converting the adjusted baseband signal by the oscillation signal to generate the blocker replica;
• wherein the inbound baseband signal is obtained from a subtraction of the inbound RF signal and the blocker replica.

A leakage cancellation method for a full division duplex system, comprising:

• receiving an inbound RF signal of a first band and down converting it to generate an inbound baseband signal;
• up converting an outbound baseband signal by an oscillation signal to generate an outbound RF signal of a second band for transmission;
• calculating leakages from the outbound RF signal to generate a blocker replica, comprising:
• collecting leakages from the outbound RF signal from a non-conductive coupling path extended from the input of receiver, thereby producing an induction signal;
• down converting the induction signal by the oscillation signal to generate a preliminary baseband signal;
• adjusting phase, gain and DC offset of the preliminary baseband signal and low pass filtering it to output an adjusted baseband signal;
• and
• up converting the adjusted baseband signal by the oscillation signal to generate the blocker replica;
• wherein the inbound baseband signal is generated from a subtraction of the inbound RF signal and the blocker replica.

A leakage cancellation method, comprising:

• receiving an inbound RF signal of a first band to generate an inbound baseband signal;
• up converting an outbound baseband signal by an oscillation signal to generate an outbound RF signal of a second band for transmission;
• calculating leakages from the outbound RF signal to generate a blocker replica, comprising:
• receiving an induction signal from a non-conductive coupling path extended from the receiver;
• down converting the induction signal by the oscillation signal to generate a preliminary baseband signal;
• comparing the preliminary baseband signal with the outbound baseband signal to calculate a error parameter indicating path delay, phase imbalance and gain error of the leakages from the outbound RF signal;
• compensating the outbound baseband signal by the error parameter to generate an adjusted baseband signal;
• and
• up converting the adjusted baseband signal by the oscillation signal to generate the blocker replica;
• wherein the inbound baseband signal and the induction signal are obtained from a subtraction of the inbound RF signal and the blocker replica.