Non-linear distortion compensation device of power amplifier

Abstract

The invention relates to a non-linear distortion compensation device of a power amplifier. The non-linear distortion compensation device of the power amplifier comprises a first analog-to-digital converter, a field programmable gate array (FPGA), a digital-to-analog converter, the power amplifier and a second analog-to-digital converter, wherein the first analog-to-digital converter, the FPGA, the digital-to-analog converter, the power amplifier and the second analog-to-digital converter are connected in sequence, and the second analog-to-digital converter is connected with the FPGA. The FPGA comprises a direct digital control (DDC)_digital up conversion (DUC) module, a cell failure ratio (CFR) peak clipping module, a digital pre-distortion (DPD) module, a self-adaption module and a memory, wherein an input end of the DDC_DUC module is connected with the first analog-to-digital converter, the DDC_DUC module, the CFR peak clipping module and the DPD module are connected in sequence, the DPD module is connected with the digital-to-analog converter and the self-adaption module, the self-adaption module is connected with the memory, and an output end of the second analog-to-digital converter is connected with the memory. Compared with the prior art, the non-linear distortion compensation device of the power amplifier has the advantages of saving cost of the FPGA, being high in stability, and the like.

Description

technical field [0001] The invention relates to a technology related to power amplifiers, in particular to a nonlinear distortion compensation device for power amplifiers. Background technique [0002] The demand for modern wireless communication services is growing rapidly, and wireless communication is required to have high-quality and large-capacity transmission methods. Linearization of power amplifiers has become a hot technology. [0003] The traditional technology to solve the linearization of power amplifiers is to use power back-off, feed-forward, negative feedback and pre-distortion technology. The power utilization rate of the power amplifier is low, and a larger power amplifier has to be selected in order to meet the usage requirements for the backed power, which wastes energy and increases costs. Another analog pre-distortion technology is to pre-distort the amplitude and phase of the input signal to achieve the purpose of linearization. The feedback method is...

AI Technical Summary

Problems solved by technology

[0003] The traditional technology to solve the linearization of power amplifiers is to use power back-off, feed-forward, negative feedback and pre-distortion technology. The power utilization rate of the power amplifier is low, and a higher power amplifier has to be selected in order to meet the usage requirements for the backed power, which wastes energy and increases costs

Another analog pre-distortion technology is to pre-distort the amplitude and phase of the input signal to achieve the purpose of linearization. The feedback method is not suitable for wide-band signals and the feed-forward method is suitable for wide-band signals, but the characteristics of the power amplifier will vary with time. time, the performance of the feed-forward system will deteriorate as the device characteristics change

Digital pre-distortion technology is currently the most used method, which is to use digital adaptive technology to construct an adaptive power amplifier inverse system to compensate for the nonlinear distortion of the amplifier. However, using low-cost FPGA to implement the pre-distortion algorithm requires a lot of resources , but it is difficult to debug and timing analysis by using the method of FPGA embedded MCU

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