Power-amplifier pre-distortion device and method based on simplified Volterra series

Abstract

The invention discloses a power-amplifier digital pre-distortion device based on first-order truncation dynamic deviation reducing Volterra series of a nonlinear filter. The power-amplifier digital pre-distortion device is characterized in that a digital pre-distorter is used for performing digital pre-distortion treatment on an input digital baseband signal; a power amplifier is used for outputting an analogue baseband signal; the analogue baseband signal is coupled by power of an attenuation coupler, orthogonally demodulated by a broadband orthogonal demodulator and converted from analogue and digital by an analogue-to-digital converter to generate an output digital baseband signal; the input digital baseband signal and the output digital baseband signal are synchronized and then input in a pre-distorter training block; and the pre-distorter training block is used for performing parameter training by using a least squares algorithm to obtain model parameters. The invention also provides a power-amplifier digital pre-distortion method. According to the power-amplifier digital pre-distortion device and method, some other operations of high order operation and opening radical sign in the simplified Volterra series model are avoided; difficulty and complexity for processing digital signals are reduced; the model parameters are distributed more evenly; and nonlinear characteristics and memory effects of the power amplifier can be well compensated.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a first-order truncation dynamic deviation reduction (Dynamic Deviation Reduction) Volterra series power amplifier digital pre-distortion device and method based on a nonlinear filter. Background technique [0002] With the development of wireless mobile communication systems, data traffic is increasing rapidly, spectrum resources are increasingly scarce, and the peak-to-average ratio and bandwidth of signals transmitted in the system are becoming larger. For example, the single-carrier signal bandwidth in the WCDMA third-generation mobile communication system is 5MHz; the single-carrier signal bandwidth in the LTE fourth-generation mobile communication system is changed to 20MHz, and the peak-to-average ratio of the LTE signal even exceeds 10dB. The wideband signal with high peak-to-average ratio has high requirements on the linearity of the RF power ampli...

AI Technical Summary

Problems solved by technology

Neural network models are often too complex to be implemented in the digital domain

The first-order truncated dynamic offset to reduce the Volterra series is a simplified Volterra series model for nonlinear modeling of power amplifiers, but it also has the disadvantages of general Volterra series with many parameters and a large amount of calculation.

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