数字接收机中自动增益控制技术设计

Design of AGC in Digital Receiver

论文设计了前馈式和反馈式数字AGC(自动增益控制)算法。经仿真、分析表明,两种算法均能有效的实现信号的自动增益控制。其次,基于前馈数字AGC的仿真模型,完成算法的数字化硬件设计和调试,验证了该算法能够正常工作。为降低传统实现方案的硬件计算复杂度,运用不同的模值估计方法,简化数字AGC电路的设计。通过仿真与实现,说明简化方案可在实际工程中应用。

The paper proposes two AGC algorithms：feedforward AGC and feedback AGC. After discussion and simulations of AGC,the results show that the two algorithms can achieve automatic gains control of input signal effectively. Moreover,based on the emulation model of feedforward AGC,the implementation and test are carried out,which proves the available of the algorithm in practical application. Meanwhile,the digital AGC circuits are simplified based on the different estimations of the amplitude of input signal,which reduces the complexity of hardware circuits. According to the simulation results,the scheme is suitable for practical application.