Automatic Gain Control (AGC) for Digital Modulation Systems - Implemented using Matlab
Automatic gain control (AGC) is one of the commonly used technologies in digital communication systems, used to adjust the amplitude of the signal when receiving it to keep the signal within the appropriate range, thereby improving system performance. In this article, we will use Matlab to realize the AGC function in the digital modulation system.
AGC principle
The main goal of AGC is to keep the amplitude of the received signal within an appropriate range and not be affected by changes in signal strength. It does this by dynamically adjusting the gain of the received signal. When the signal strength is weak, the AGC will increase the gain to improve the signal-to-noise ratio; when the signal strength is strong, the AGC will reduce the gain to avoid overload. This ensures that the signal remains within a proper range during reception, making it easy to demodulate and process.
Matlab Implementation
The following is a sample code for implementing the AGC function in a digital modulation system using Matlab:
% 参数设置
fs = 1000; % 采样率
t = 0:1/fs:1