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设计了一个新型的自动增益控制(Automatic Gain Control,AGC)方法。针对某数字通信系统的需求,所设计的AGC可以充分利用ADC量化位数,并能够处理LTE多种传输模式(TM2和TM3)信号。仿真结果表明,本AGC能够同时适用于TM2和TM3信号,能够在充分利用ADC量化位数的同时避免过饱和现象,能够准确判断输入信号功率变化状态并迅速调整,从而对稳定功率的输入信号给出恒定的增益。
A new automatic gain control (AGC) method is designed. For the needs of a digital communication system, the AGC is designed to take full advantage of the ADC quantization bits and to handle multiple LTE transmission modes (TM2 and TM3). The simulation results show that the AGC can be applied to both TM2 and TM3 signals, which can fully utilize the quantization bits of the ADC and avoid the supersaturation, and can accurately determine the power variation state of the input signal and quickly adjust, so as to stabilize the power input signal A constant gain.