Device and method for digital predistortion of power amplifier based on cubic spline band-limited ddr function model

Abstract

The invention discloses a power amplifier digital predistortion device based on a cubic spline band-limited DDR function model, including a digital pre-distorter based on a cubic spline band-limited DDR function model, and a digital baseband signal x(n) is digitally processed. Generate predistorted signal x after predistorter pre (n), predistortion signal x pre (n) Generate a band-limited digital baseband signal u(n) after sequentially passing through a digital-to-analog converter, a broadband quadrature modulator, a power amplifier, an attenuation coupler, an analog bandpass filter, a broadband quadrature demodulator, and an analog-to-digital converter ), the band-limited digital baseband signal u(n) and the digital baseband signal x(n) are sent to the digital predistortion training module based on the band-limited DDR function model of the cubic spline respectively, and the band-limited DDR function model based on the cubic spline The signal generated by the digital pre-distortion training module is sent to the digital pre-distorter. The invention reduces the polynomial order of the DDR function model, reduces the number of multipliers used, and reduces the complexity of digital signal processing.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a power amplifier digital predistortion device and method based on a cubic spline band-limited DDR function model. Background technique [0002] With the wide application of the fourth-generation mobile communication system and the in-depth research of the fifth-generation mobile communication technology, the data traffic of the communication system is increasing day by day. The method leads to higher signal peak-to-average ratio, and the baseband signal with wideband peak-to-average ratio has high requirements on the linearity of the RF power amplifier. [0003] Because broadband signals pass through nonlinear power amplifiers, spectrum expansion will occur, so the transceiver system needs to use high-speed DAC and ADC to meet the realization conditions of traditional digital pre-distortion technology. The high cost of high-speed analog-to-digital and digital-to-analog conv...

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Problems solved by technology

[0004] "Band-Limited Volterra Series-Based Digital Predistortion for Wideband RFPower Amplifiers" introduces the technology of using the band-limited method to reduce the ADC sampling rate, but the DDR function model used in the paper has the problem of high order and difficult implementation

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