Method and device for protecting power amplifier

Abstract

The invention discloses a method and a device for protecting a power amplifier. The method comprises steps as follows: signal data subjected to digital pre-distortion are sampled; a power spectrum density of an out-of-band signal with a signal channel bandwidth is acquired according to a bandwidth value of a signal channel configured by a system as well as a sampling rate; and when the sampled signal data are determined to be abnormal according to the power spectrum density of the out-of-band signal, the power amplifier is closed. By means of the method and the device, the problem that the power amplifier cannot be effectively protected when encountering signals with abnormal wide spectrums due to the fact that the power amplifier is protected according to a power average value of an input signal in correlation techniques is solved, and conditions that the signals with abnormal wide spectrums caused by digital pre-distortion are corrected due to insufficient protection of the power amplifier according to the power average value and the power amplifier is burnt due to the signals with abnormal wide spectrums are avoided, so that the protection of the power amplifier is enhanced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for protecting a power amplifier. Background technique [0002] In order to improve the adjacent channel leakage ratio (ACLR) of the antenna port and the efficiency of the power amplifier in the wireless communication base station system, the radio frequency unit needs to perform digital pre-distortion processing on the signal. Digital predistortion is carried out in the digital domain. According to the collected forward and feedback data, the distortion characteristics of the power amplifier are fitted, and then the signal is processed by digital predistortion. The output signal of the digital predistortion processed signal after passing through the power amplifier has Good linearity, reaching the ACLR index that meets the system requirements. However, due to a variety of reasons, the signal after digital predistortion may produce unintended distortion, suc...

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Problems solved by technology

[0005] Aiming at the problem that the power amplifier is protected according to the power average value of the input signal in the related art, but the power amplifier cannot be effectively protected for the abnormal wide-spectrum signal, the present invention provides a power amplifier protection method and device to at least solve the problem of above question

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