Power amplifying system and method for generating pre-distortion signals

Abstract

The invention discloses a power amplifier system and a method for generating a pre-distortion signal. The power amplifier system calculates the transmission digital signal and the feedback digital signal in a digital signal processor (DSP), extracts pre-distortion parameters, and provides the parameters to A pre-distortion chip based on the Volterra series model or its derivative model. The pre-distortion chip uses the Volterra series model and its derivative model to perform pre-distortion processing on the transmitted digital signal to obtain a pre-distortion signal, and then transmit the pre-distortion signal through the The channel is sent to the power amplifier for amplification, and the method can greatly improve the linearity and efficiency of the power amplifier, facilitate the automation of production, and reduce the production cost and maintenance cost.

Description

technical field [0001] The invention relates to power amplifier design technology, in particular to a linear power amplifier system and a method for generating predistortion signals using digital baseband predistortion technology. Background technique [0002] Improving system capacity and reducing equipment cost is a goal that wireless broadband communication systems have always pursued. In broadband WCDMA and CDMA2000 multi-carrier base station systems, the linear power amplifier is a very expensive component to manufacture and operate. Reducing the production cost of the linear power amplifier and improving the efficiency of the power amplifier will greatly reduce the production and operation costs of the base station. The characteristics of the digital IF signal of the multi-carrier base station and the existing power amplifier design technology determine that the high-efficiency multi-carrier linear power amplifier is a very difficult but crucial component to design. ...

AI Technical Summary

Problems solved by technology

However, for broadband multi-carrier base station systems, due to the large bandwidth, the power amplifier is no longer memoryless, but a non-linear system with memory, reflected in the corresponding relationship between input and output signals, the actual output signal and the amplitude of the input signal The relationship is no longer a simple one-to-one relationship, so the above-mentioned AM-AM model and AM-PM model are not suitable for describing the input-output relationship of the wideband multi-carrier base station system power amplifier

In the existing digital baseband predistortion technology, a very accurate model has not been used for the broadband multi-carrier base station system to describe the functional relationship between the input and output signals of the power amplifier.

Therefore, the linearity and efficiency of power amplifiers in existing broadband multi-carrier base station systems are not very high

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