基于FPGA的AM数字调制解调设计验证与分析

Design of AM Digital Modulation and Demodulation Based on FPGA

AM和正交调制解调是通信领域应用最广泛的基础技术,由此提出了一种简单基于FPGA数字实现AM和正交调制解调的方法,具有较好的抗噪声性能及较强的抗频偏能力,并推导了所允许的最大载频偏差(Δf_(max)),为实际应用提供了理论依据;该调制解调方法实现简单,通用性强,并有较好的可靠性、抗噪声性及抗载频适配能力。利用Matlab仿真软件建立了可视化的AM通信系统模型,介绍了AM系统的工作原理、AM信号的产生和解调方法,设计电路参数和基本数据对实际应用有一定的参考意义。

AM and quadrature modulation and demodulation are the most extensive basic technologies in the field of communication.Therefore,proposed is a simple method based on FPGA digital implementation of AM and quadrature modulation and demodulation,which has better anti-noise performance and strong resistance.The frequency offset capability and the maximum carrier frequency deviation(Δfmax)allowed are derived,which provides a theoretical basis for practical applications;the modulation and demodulation method is simple to implement,has high versatility,and has good reliability,noise resistance and antiloading.The AM communication system model is established by using Matlab.The working principle of AM system,the generation and demodulation method of AM signal are introduced.The design circuit parameters and basic data have certain reference significance for the actual circuit design.