An apparatus adapted to implement digital baseband predistortion, comprising a transmission channel comprising a digital-to-analog converter, a modulator, an amplifier, and a power amplifier, wherein the modulator is connected to the output of the digital-to-analog converter, the power amplifier is connected to the output of the modulator via the amplifier, wherein the apparatus further comprises: a feedback channel analog part comprising a diode detector, a filter and an analog-to-digital converter, and a feedback channel digital part comprising a predistorter, a modulus obtaining unit, a predistortion coefficient generator and a feedback correcting unit; the diode detector is configured to obtain an envelope of an output signal of the power amplifier; the filter is connected with the diode detector, and is configured to filter the envelope obtained by the diode detector; the analog-to-digital converter is connected with the filter, and is configured to perform analog-to-digital conversion on an output signal of the filter; the modulus obtaining unit is configured to obtain a modulus of an input signal of the apparatus; the feedback correcting unit is connected with the analog-to-digital converter, and is configured to obtain an output signal of the analog-to-digital converter, and to perform nonlinear correction processing of the diode detector on the output signal of the analog-to-digital converter according to a correction coefficient of the diode detector; the predistortion coefficient generator is connected with the modulus obtaining unit and the feedback correcting unit, and is configured to obtain an output signal of the modulus obtaining unit and an output signal of the feedback correcting unit, and compare the obtained output signal of the modulus obtaining unit and the obtained output signal of the feedback correcting unit to obtain signal distortion of the transmission channel; the predistorter is connected with the predistortion coefficient generator and the digital-to-analog converter, and is configured to perform digital baseband predistortion processing on the input signal of the apparatus according to the signal distortion of the transmission channel output by the predistortion coefficient generator, and to send an output signal obtained after the digital baseband predistortion processing to the digital-to-analog converter; the apparatus further configured to: control an output power of the power amplifier to operate at a linear interval; obtain a nonlinear distortion parameter of the diode detector; and obtain a correction coefficient of the diode detector according to the nonlinear distortion parameter; wherein after the correction coefficient of the diode detector is obtained, the apparatus is further configured to: adjust a transmission power of the power amplifier to a nonlinear interval. a feedback channel analog part comprising a diode detector, a filter and an analog-to-digital converter, and a feedback channel digital part comprising a predistorter, a modulus obtaining unit, a predistortion coefficient generator and a feedback correcting unit; the diode detector is configured to obtain an envelope of an output signal of the power amplifier; the filter is connected with the diode detector, and is configured to filter the envelope obtained by the diode detector; the analog-to-digital converter is connected with the filter, and is configured to perform analog-to-digital conversion on an output signal of the filter; the modulus obtaining unit is configured to obtain a modulus of an input signal of the apparatus; the feedback correcting unit is connected with the analog-to-digital converter, and is configured to obtain an output signal of the analog-to-digital converter, and to perform nonlinear correction processing of the diode detector on the output signal of the analog-to-digital converter according to a correction coefficient of the diode detector; the predistortion coefficient generator is connected with the modulus obtaining unit and the feedback correcting unit, and is configured to obtain an output signal of the modulus obtaining unit and an output signal of the feedback correcting unit, and compare the obtained output signal of the modulus obtaining unit and the obtained output signal of the feedback correcting unit to obtain signal distortion of the transmission channel; the predistorter is connected with the predistortion coefficient generator and the digital-to-analog converter, and is configured to perform digital baseband predistortion processing on the input signal of the apparatus according to the signal distortion of the transmission channel output by the predistortion coefficient generator, and to send an output signal obtained after the digital baseband predistortion processing to the digital-to-analog converter; the apparatus further configured to: control an output power of the power amplifier to operate at a linear interval; obtain a nonlinear distortion parameter of the diode detector; and obtain a correction coefficient of the diode detector according to the nonlinear distortion parameter; control an output power of the power amplifier to operate at a linear interval; obtain a nonlinear distortion parameter of the diode detector; and obtain a correction coefficient of the diode detector according to the nonlinear distortion parameter; wherein after the correction coefficient of the diode detector is obtained, the apparatus is further configured to: adjust a transmission power of the power amplifier to a nonlinear interval.