1.1 背景以及意义..................................................................................1
1.2 发展前景..........................................................................................1
2. AM 信号调制原理以及特点...........................................................3
2.1 噪声模型..........................................................................................3
2.1.1 噪声的分类 .......................................................................................................3
2.1.2 本文噪声模型..................................................................................................3
2.2 通用调制模型..................................................................................4
2.3 AM 信号的调制原理 .......................................................................4
2.3.1 AM 信号数字模型以及特点 ....................................................................4
2.3.2 AM 信号的波形和频谱特性 ....................................................................5
3. AM 信号的解调原理以及特点.......................................................6
3.1 AM 信号的解调原理及方式 ...........................................................6
3.2 AM 信号的相干解调 .......................................................................6
3.3 AM 信号的非相干解调 ...................................................................6
4. 抗噪声性能的分析模型 .................................................................7
4.1 相干解调的抗噪声性能 ...............................................................7
4.2 非相干解调的抗噪声性能...............................................................9
4.3 小信噪比情况...................................................................................9
5. AM 调制与解调的仿真...................................................................9
5.1 AM 调制 ...........................................................................................9
5.1.1 建立仿真模型..................................................................................................9
5.1.2 参数设置...........................................................................................................10
5.1.3 仿真波形图 .....................................................................................................12
5.2 AM 信号的解调仿真 .....................................................................13
5.2 .1AM 相干解调模型仿真.............................................................................13
5.2.2 参数设置............................................................................................................13
5.2.3 仿真波形图 .....................................................................................................14
5.2.4 相干解调抗噪声性能分析.......................................................................15
6.AM 信号的频谱分析......................................................................16
7.总结 .................................................................................................20
致谢 ....................................................................................................21
参考文献 ............................................................................................22
