自动增益控制是根据输入信号的强度自适应动态调整信道增益的一种常用方法。对于电平动态变化较大的输入信号，通过自动增益控制可以将其处理为稳定幅度的输出信号。针对宽带多载波信号，本文提出了一种模拟中放控制 + 数字域幅度调整的自动增益控制方法。该方法通过控制中放模拟电压和数字域调整幅度，可以实现对同一接收信道内不同输入电平信号的独立稳副输出控制，已成功运用于工程实践中。
Automatic gain control is used to adjust the channel gain adaptively according to the input signal level. It can process the input signal with large dynamic level change into the output signal with stable amplitude. For the automatic gain control of wideband multi-carrier signal, a method based on analog amplifier control and digital amplitude adjustment is proposed in this paper. By controlling the analog voltage and the digital amplitude, the stable output amplitude control of different input level signals in a receiving channel can be realized independently. It has been successfully used in engineering practice.
