Power amplifier nonlinear self-adaptive simulation method based on sectioned polynomial and power amplifier nonlinear self-adaptive simulation system thereof

Abstract

The invention relates to a power amplifier nonlinear self-adaptive simulation method based on a sectioned polynomial. The power amplifier nonlinear self-adaptive simulation method comprises the steps that the amplitude of input signals is acquired according to the input digital baseband signals; power amplifier nonlinear characteristics are divided into three sections; the initial values of three sections of polynomial coefficients are stored in an ROM lookup table; the polynomial coefficient of the corresponding section is obtained through table look-up; the amplitude and the phase of output signals are acquired and the expected output signals are acquired through synthesis; and the expected output signals and partial feedback simulation output signals are compared so that error signals are acquired, the polynomial coefficients in the lookup table are continuously updated and finally the simulation output signals are enabled to approximate the expected output signals. The invention also discloses a power amplifier nonlinear self-adaptive simulation system based on the sectioned polynomial. With application of the simulation method based on the sectioned polynomial, the power amplifier nonlinear characteristics are described in the sectioned manner according to the amplitude of the input signals, and each section only uses one low-order polynomial for approximation so that the simulation precision can be enhanced and the computational complexity can be reduced.

Description

technical field [0001] The invention relates to the technical field of aircraft measurement and control systems, in particular to a segmented polynomial-based power amplifier nonlinear self-adaptive simulation method and system. Background technique [0002] In recent years, the development of global communication technology is changing with each passing day, especially the development trend of wireless communication is in full swing, and RF power amplifier is the key device in the wireless communication system, and it is also the most difficult and expensive part to realize. It is used to amplify the power of the modulated signal to obtain a higher signal power value to meet the needs of long-distance transmission. Generally speaking, when the input signal power is small, the power amplifier has good linearity. However, in actual engineering, in some special occasions, such as relay satellite communication systems, in order to improve work efficiency, the power amplifier is...

AI Technical Summary

Problems solved by technology

The polynomial method has a fast convergence speed and saves storage space. The larger the order and the memory depth, the higher the accuracy, but it will lead to a sharp increase in the amount of calculation, and it is difficult to implement the system.

Both methods have certain limitations, so far there has not been a widely accepted modeling method

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