基于 MATLAB 的 AM 调制及解调系统仿真摘要:振幅调制、解调电路是信号在发射机和接收机之间进行传送时的信号处理电路。标准振幅调制与解调电路实际上是完成信号频谱的线性搬移,以便于信号的传送。MATLAB 是一种用于算法开发、数据可视化、数据分析以及数值计算的高级技术计算语言和交互式环境具有强大的软件仿真建模能力,可通过 MATLAB 建立完整的 AM 调制、解调系统的仿真模型,描绘出信号在调制与解调过程的波形变化,探究调制解调的影响因素,以便于更好的了解AM 调制与解调的过程。关键词:MATLAB AM 调制 解调Abstract: the amplitude modulation and demodulation circuit is the signals between the transmitter and receiver of the signal processing circuit. Standard of amplitude modulation and demodulation circuit is actually the complete spectrum of linear move, so that the transfer of a signal. MATLAB is a kind of for algorithm development, data visualization, data analysis and numerical calculation of senior technical computing language and interactive environment, is a powerful software simulation modeling ability, can build complete AM modulation and demodulation system by MATLAB, a simulation model of describing the waveform of the signal in the modulation and demodulation process changes, to explore the influencing factors of modem, so as to better understand the AM modulation and demodulation process.Keywords: MATLAB AM modulation demodulation1.引言在无线电技术中,调制与解调占有十分重要的地位。假如没有调制与解调技术,就没有无线电通信,没有广播和电视,也没有今日的 BP 寻呼、手持电话、传真、电脑通信及 Internet 国际互联网。振幅调制常用于长波、中波、短波和超短波的无线电广播、通信、电视、雷达等系统。这种调制方式是用传递的低频信号(如代表语言、音乐、图像的电信号)去控制作为传送载体的高频振荡波的幅度,使已调信号的幅度随调制信号的大小线性变化,而保持载波的角频率不变。在振幅调制中,根据所输出已调波信号频谱重量的不同,分为普通调幅(标准调幅,用 AM 表示)、抑制载波的双...