Method and device for protecting power amplifier in DPD (Digital Pre-Distortion) system

Abstract

The invention provides a method and device for protecting a power amplifier in a DPD (Digital Pre-Distortion) system, which are used for solving the problem of burn-down of the power amplifier by possible instantaneous large stray caused by detection and protection of only mean-value power during protection of the power amplifier in the prior art. The device comprises a forward mean-value power detection and comparison unit, a baseband signal switch unit, a radiofrequency transmitting and processing unit, a power amplifying unit, a DPD operation unit, a level threshold control unit and a feedback unit. By adopting the method and the device, input mean-value power is detected, an input instantaneous ultrahigh level can be detected and controlled in time, instantaneous large stray is prevented from burning the power amplifier down, and the system reliability is enhanced; and meanwhile, mean-value and peak-value power output by the power amplifier can be detected and protected, so that the competitive power of a mobile communication system is greatly enhanced in a quadruple protecting mode.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for protecting a power amplifier realized by FPGA in a DPD system. Background technique [0002] In the existing mobile communication base station system, the power amplifier module completes the function of amplifying the power of the forward transmission signal and outputting it from the antenna. Covering the normal communication of users in the service area has very serious consequences. Based on this, base station equipment manufacturers or power amplifier manufacturers must add many protection circuits and measures to the power amplifier module. The existing technology generally uses a detection circuit to detect the output power. There is a problem of integration time in the output power of the power amplifier. If there is an instantaneous large digital spur, the detection circuit will react slowly, and the power amplifier may still be burned. [00...

AI Technical Summary

Problems solved by technology

[0002] In the existing mobile communication base station system, the power amplifier module completes the function of amplifying the power of the forward transmission signal and outputting it from the antenna. Covering the normal communication of users in the service area, the consequences are very serious

Based on this, base station equipment manufacturers or power amplifier manufacturers must add many protection circuits and measures to the power amplifier module. The existing technology generally uses a detection circuit to detect the output power. There is a problem with the integration time of the output power of the power amplifier. If there is an instantaneous large digital spur, the detection circuit will react slowly, and the power amplifier may still be burned.

[0003] The document with the application number of 200510036722.3 discloses a method and device for protecting the power amplifier based on FPGA, but this solution only discloses the method and device for protecting the power amplifier based on the average power detection of the baseband signal, and does not propose to protect the power amplifier from instantaneously appearing The method of detecting the level, and the above-mentioned documents only detect and protect the input power, and do not detect and protect the output power

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