Apparatus and method for implementing predistortion treatment of baseband signal

Abstract

The invention discloses a device for digital predistortion (DPD) processing of baseband signals, comprising at least one baseband carrier unit, a reverse training unit and a DPD processing unit, wherein the DPD processing unit is used for storing and updating a predistortion coefficient table, acquiring the mean amplitude of digital baseband signals of various carriers of the current time slot, calculating and obtaining the mean DPD input amplitude of the current time slot according to the mean amplitude of the digital baseband signals of the various carriers of the current time slot, selecting a corresponding predistortion coefficient from the predistortion coefficient table according to the mean DPD input amplitude of the current time slot to perform predistoriton processing on the digital baseband signals of the current time slot, and then generating output of the digital predistortion baseband signals. Moreover, the invention also discloses a method for digital distortion processing of the baseband signals. The proposal in the device can improve the efficiency of data transmission.

Description

Technical field [0001] The present invention relates to signal processing technology in the communication field, and in particular to a device and method for performing digital predistortion processing on baseband signals. Background technique [0002] Digital predistortion (DPD) technology is widely used to improve the efficiency of power amplifiers. According to the non-linear characteristics (amplitude and phase distortion) of the power amplifier, reverse predistortion processing is performed on the signal input to the power amplifier, that is, the use of The predistortion coefficient calculated by the linear characteristic performs predistortion processing on the input signal, and inputs the predistorted signal to the power amplifier to combine the two nonlinear distortion functions to obtain a highly linear, distortion-free amplified output signal. [0003] The transmission link of the communication system usually includes a power amplifier, which is used to power amplify th...

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Problems solved by technology

[0017] In the above-mentioned device, since the predistortion coefficient is searched according to the instantaneous and short-term power statistics of the baseband digital signal from the digital modulation unit, on the one hand, it takes a lot of time to perform calculations such as power statistics, resulting in the need for digital modulation. The baseband digital signal of the unit is delayed, which reduces the efficiency of signal transmission; on the other hand, because the statistical calculation of instantaneous and short-term equal power is based on the slow change of signal power, at this time, for systems such as TDD, due to The power of signals in different time slots will change suddenly, so when this method is used, it will cause problems such as inaccurate selection of pre-distortion coefficients

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