Patent ID: 8885765

Claim:
A user terminal, comprising: a transmit chain, configured to transmit a radio frequency signal which is converted from a first baseband signal originated in the user terminal, wherein the radio frequency signal has a transmitting frequency; a receive chain, configured to produce a second baseband signal or a third baseband signal; a setting unit, configured to set a control command for the receive chain, wherein the control command is selecting a data collection mode or a normal receiving mode; an adaptive factor updating module, coupled to output of the receive chain and configured to receive the second baseband signal and calculate a predistortion factor according to the first baseband signal and the second baseband signal; and a digital predistorter, configured to perform predistortion factor update by using the calculated predistortion factor, and perform predistortion by using an updated predistortion factor; wherein when the control command from the setting unit is selecting the data collection mode, the receive chain converts the radio frequency signal into the second baseband signal, and when the control command from the setting unit is selecting the normal receiving mode, the receive chain converts a received signal which has a receiving frequency from an antenna into the third baseband signal.