A method and device for digital predistortion based on broadband wireless communication system

Abstract

The invention discloses a digital pre-distortion method and device based on a broadband wireless communication system, and the method comprises the steps: generating a training sequence, reserving a gap between two adjacent repeated bursts in the training sequence, and enabling the repeated bursts to comprise a synchronization sequence and a single-tone signal; determining a single-tone signal starting position of each repeated burst according to the synchronization sequence; fixing the single-tone signal frequency of the training sequence, adjusting the power of the single-tone signal, training to obtain the nonlinear distortion characteristics of the power amplifier, and adjusting nonlinear pre-distortion parameters in the digital pre-distorter; fixing the power of the single-tone signalof the training sequence in the linear interval of the power amplifier, adjusting the frequency of the single-tone signal, training to obtain the memory distortion characteristic of the power amplifier, and adjusting the memory pre-distortion parameter in the digital pre-distorter. Parameters in the pre-distorter only need to be trained in the initial stage, so that a self-adaptive algorithm is converted into a training algorithm.

Description

technical field [0001] The present invention relates to the technical field of digital predistortion, in particular to a method and device for digital predistortion based on a broadband wireless communication system. Background technique [0002] With the development of wireless communication technology, limited spectrum resources require more and more data to be carried, so spectrum resources are becoming increasingly scarce. In the wireless communication system, high-order modulation technologies such as Quadrature Amplitude Modulation (QAM) and broadband transmission technologies such as Orthogonal Frequency Division Multiplexing (OFDM) are combined to obtain improved spectrum utilization. . [0003] As one of the key technologies of the fourth generation mobile communication (4th Generation Mobile Communication, 4G), OFDM is also generally considered to have an important position in the fifth generation mobile communication (Fifth Generation Mobile Communication, 5G). ...

AI Technical Summary

Problems solved by technology

The current baseband predistortion technology generally undergoes loop delay estimation before the input signal x(n) enters the training algorithm. The loop delay estimation will estimate the loop delay, so as to ensure that the input signal x(n) It is synchronized with the data u(n) after feedback processing, but this method has relatively high requirements for loop delay estimation. When the delay estimation is inaccurate, the training algorithm will also be affected, thus affecting the parameters of the predistorter calculate

Images