高效数字检波的自动增益控制环路研究

针对数字式自动增益控制环路中包络检波需要乘法器，大量耗费系统资源的缺点，提出了一种基于绝对值方法或滑窗最大值法代替模拟检波方法中的信号的平方运算进行数字包络检波的新方法，其结果可以大大减小系统速度和资源之间的矛盾。在对环路进行理论分析的基础上，进行了环路的计算机仿真，仿真结果说明了两种方案的可行性，并证明都是高效的，并已实用于数字中频接收机的数字式自动增益控制环路设计中。

According to the disadvantages of demodulation in digital automatic gain control loop, which needs multipliers and uses much of the system resource, this paper proposed a new method of digital demodulation by means of absolute values or maximal values of slip windows which can substitute the square operation of signals in analog demodulation method. The new method can reduce, to a large extent, the contradiction between the system velocity and resource. Based on the analysis of the loop, the computer simulations are given. The results indicate the feasibility of digital AGC, and they are highly effective. The method has been used in design of digital AGC of digital intermediate frequency receiver.