Method and device for protecting power amplifier

A power amplifier and power spectral density technology, applied in the field of communication, can solve the problems of protection, abnormal wide-spectrum signals cannot be effectively used for power amplifier, etc., and achieve the effect of avoiding burnout and strengthening protection.

CN103326674AActive Publication Date: 2013-09-25ZTE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-09-25

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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.
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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...

Examples

Embodiment Construction

[0027] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0028] In the related art, the power amplifier is protected according to the signal power in the time domain. The embodiment of the present invention provides a power amplifier protection method and device. The method and device protect the power amplifier by detecting abnormal wide-spectrum signals. , which avoids the abnormal wide-spectrum signal input to the power amplifier. The following will be described in detail through examples.

[0029] This embodiment provides a protection method for a power amplifier, which can be implemented in a device (such as a wireless communication base station, etc.) or in a system. This embodiment is described by implementing it on a device, such as figure 1 The ...