Reconfigurable digital pre-distortion system and method of millimeter wave broadband power amplifier

Abstract

The invention discloses a reconfigurable digital pre-distortion system of a millimeter wave broadband power amplifier. The reconfigurable digital pre-distortion system comprises a digital pre-distortion model, a power amplifier, an analog tape limit filter and a model coefficient extraction module, the digital pre-distortion model generates an output signal of the digital pre-distortion model viaan original baseband input signal, the output signal of the digital pre-distortion model is sent to the power amplifier and the model coefficient extraction module, a small part of the signal obtainedby processing the output signal of the power amplifier is also transmitted back to the model coefficient extraction module, and the model coefficient extraction module extracts a digital pre-distortion model coefficient and sends the same to the digital pre-distortion model. The invention further discloses a pre-distortion method using the system. The reconfigurable digital pre-distortion systemcan flexibly select the subcarriers according to demands so as to save spectrum resources; the processing bandwidth necessary for the traditional digital pre-distortion technology is reduced; and thepressure of the existing digital signal processing chip for the high-rate data is reduced.

Description

technical field [0001] The invention relates to the technical field of digital linearization of power amplifiers, in particular to a reconfigurable digital predistortion system and method of millimeter wave broadband power amplifiers. Background technique [0002] The rapid development of wireless communication technology and the upcoming fifth generation mobile communication (5G) era have put forward new requirements for power amplifiers. The large-bandwidth signal to be adopted in 5G wireless communication technology can provide a data transmission rate of Gbps order, which can meet the needs of many high-speed data transmissions, such as 8K broadcast TV. Like existing 3G and 4G technologies, millimeter wave power amplifiers used in 5G systems also face the problem of power efficiency. In order to solve this problem, the power amplifier needs to work in the saturation region, but in this way, nonlinearity will be introduced. Digital predistortion technology has become a ...

AI Technical Summary

Problems solved by technology

[0003] (1) For existing digital signal processing chips, the baseband data processing rate required by traditional digital predistortion technology is too high;

[0004] (2) The analog bandwidth of the transmitter and feedback loop is too wide to be realized;

[0005] (3) In the face of different carrier modes, the traditional technology applies a unified digital pre-distortion model, which is not efficient and flexible enough

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