Automatic gain control method and device with temperature compensation, digital communication system

Abstract

The invention provides an automatic gain control method and device having the temperature compensation function, and a digital communication system having the temperature compensation function. The method comprises the following steps: a gain adjustment threshold temperature compensation value and a gain temperature compensation value corresponding to the current temperature point are acquired; a gain adjustment value is determined according to the peak power of an input signal and the gain adjustment threshold temperature compensation value; the power of the received signal is adjusted according to the gain adjustment value; and an output signal is generated according to the input signal and the gain temperature compensation value. According to the invention, the problem that the gain is only adjusted when the ADC overflow condition occurs can be avoided, the communication quality can be improved, and at the same time, the output signal overflow phenomenon caused by gain temperature compensation when the ADC overflow condition does not occur can be avoided, so not only the gain fluctuation of a receiving link can be ensured to be in good effects, and but also the ADC optimal performances can be realized, the equipment performance indexes can be improved, and advantages of good application prospects and high promotional value can be realized.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an automatic gain control method with temperature compensation, a digital-analog combined automatic gain control device with temperature compensation, and a digital communication system with a digital-analog combined automatic gain control function with temperature compensation. Background technique [0002] At the receiving end of the existing digital communication system, especially at the receiving end of some relay equipment (such as RRU (Radio Remote Unit, remote radio system), repeater), the power of the received signal is often uncontrollable. For the receiving link with analog-to-digital conversion function, in order to maximize the signal-to-noise ratio of the received signal, it is generally required that the input power reach the full scale of the ADC (analog-to-digital converter) as much as possible, but due to the uncontrollable input power, in order to To avoi...

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Problems solved by technology

[0004] (1) Adjust the digital control attenuator only when the ADC overflows. Therefore, the period of time when the signal overflows will have a great impact on the performance of the device;

[0005] (2) The adaptability of temperature is not considered: at different temperatures, in order to keep the gain fluctuation of the receiving link at a better level, it is often necessary to use digital circuits to complete the gain temperature compensation function of the analog link. It may appear that the ADC does not overflow, but overflows after gain temperature compensation

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