Digital predistortion power amplifier and signal processing method thereof

Abstract

The invention discloses a digital predistortion power amplifier and signal processing method thereof. The digital predistortion power amplifier comprises a digital predistortion unit, a digital predistortion adaptive controller, a first digital-to-analogue conversion unit, an up-conversion unit, a power divider, a first wavelength delay unit, a peak value amplifier, a second wavelength delay unit,a coupler, a carrier amplifier, a first down-conversion unit, a first analogue-to-digital conversion unit, an envelope extracting unit and a first signal processing unit; wherein one end of the envelope extracting unit is connected with the base band signal receiving terminal, and the other end is connected with the grid terminal of the peak value amplifier by the first signal processing unit. The invention extracts the envelope signal of the input base band signal by the envelope extracting unit, the first signal processing unit processes the envelope signal to be operational grid voltage value of the peak value amplifier, further the grid voltage value of the peak value amplifier can be set according to the variation of the envelope signal, so as to cause the peak value amplifier to beoperate in high-efficiency state.

Description

technical field [0001] The invention relates to the field of power amplifiers in mobile communication systems, in particular to a digital predistortion power amplifier and a signal processing method thereof. Background technique [0002] With the large-scale construction of 3G networks, in order to reduce CAPEX (Capital Expenditure, capital investment) and OPEX (Operating Expense, operating costs), the efficiency of power amplifiers has increasingly become the focus of attention of operators. Common technologies that can improve the efficiency of power amplifiers include: Doherty technology, envelope tracking technology, envelope elimination regeneration technology, adaptive bias technology, peak reduction technology, etc. High-efficiency power amplifiers can not only save electricity bills for operators, but also save investment in supporting facilities such as power supplies. Due to the simplification of the production process, the requirements for heat dissipation of the ...

AI Technical Summary

Problems solved by technology

Since the envelope of the input baseband signal changes continuously, and the grid voltage 1 value of the peak amplifier is fixed, the working state of the peak amplifier cannot be set in real time as the envelope of the input baseband signal changes, resulting in digital pre-distortion The output efficiency of the power amplifier is relatively low, which limits the improvement of the power amplifier efficiency of the digital predistortion power amplifier

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