HINOC系统中数字AGC的设计与实现

Design and Implementation of Digital AGC in HINOC System

针对存在单频干扰的HINOC系统接收机大动态范围和高灵敏度的要求,提出了一种基于信号幅值对数的反馈式数字自动增益控制(DAGC)算法。该算法通过对输入信号进行功率估计、对数变换和门限比较,利用双门限的方法实现数字增益控制,扩大了HINOC接收机的动态范围,给出了详细的设计方案和仿真结果。该方法计算简单、运算量小,易于定点实现。仿真结果显示,该数字AGC具有收敛速度快、调节精度高的特点,适用于单频干扰环境下HINOC系统对信号的增益调整。

In the HINOC system with single- frequency interference, a feedback digital automatic gain control （DAGC） al- gorithm was proposed based on the logarithm of the signal amplitude. By estimating the average power of input signals,logarithmic transformation and dual threshold comparison,the algorithm realized the purpose of the digital gain control and expanded the HI- NOC receiver dynamic range. And a detailed design and simulation were proposed. The method not only has a simple and small computational complexity, but also is easy for fixed - point implementation. Simulation results show that this digital AGC has a fast convergence speed and high accuracy. Simulation proved the validity of the technique in HINOC system in the single - frequency interference environment.