摘要 ····························································································································· 1
1、设计原理 ··············································································································· 2
1.1设计目的 ··············································································································· 2
1.2仿真原理 ··············································································································· 2
1.2.1瑞利分布简介 ····························································································· 2 1.2.2多径衰落信道基本模型 ············································································· 2 1.2.3产生服从瑞利分布的路径衰落r(t) ···························································· 3
1.2.4产生多径延时 继电器控制模块····························································································· 4
1.3仿真框架 ··············································································································· 4
板栗切口机
2、设计任务 ··············································································································· 4
2.1设计任务要求 ······································································································· 4
2.2 MATLAB 仿真程序要求 ···················································································· 4
3、DSB调制解调分析的MATLAB实现 汽车香水瓶······························································· 5
3.1 DSB调制解调的MATLAB实现 ········································································ 5
3.2瑞利衰落信道的MATLAB实现 ········································································· 6
4、模拟仿真及结果分析 ··························································································· 7
深水采样器4.1模拟仿真 ··············································································································· 7
4.1.1多普勒滤波器的频响 ························································································ 7
4.1.2多普勒滤波器的统计特性 ················································································ 7
4.1.3信道的时域输入/输出波形 ··············································································· 8
4.2仿真结果分析 ······································································································· 8
4.2.1时域输入/输出波形分析 ··················································································· 8
4.2.2频域波形分析 ···································································································· 8
4.2.3多普勒滤波器的统计特性分析 ········································································ 9
5、小结与体会 ··········································································································· 9
6、参考文献 ··············································································································· 9
MATLAB 通信仿真设计
摘要
主要运用MATLAB进行编程，实现采用对输入信号进行抑制载波的双边带调幅；而后将调幅波输入信道，研究多径信道的特性对通信质量的影响；最后将信道内输出的条幅波进行同步解调，解调出与输入信号波形相类似的波形，观测两者差别。同时输出多普勒滤波器的统计特性图及信号时域和频域的输入、输出波形。 关键字：双边带调幅 瑞利衰落 相干解调 MATLAB
1、设计原理
1.1设计目的
由于多径和移动台运动等影响因素，使得移动信道对传输信号在时间、频率和角度上造成了散，如时间散、频率散、角度散等等，因此多径信道的特性对通信质量有着至关重要的影响，而多径信道的包络统计特性成为我们研究的焦点。根据不同无线环境，接收信号包络一般服从几种典型分布，如瑞利分布、莱斯分布和Nakagami-m分布。在设计中，专门针对服从瑞利分布的多径信道进行模拟仿真，进一步加深对多径信道特性的了解。
1.2仿真原理
1.2.1瑞利分布简介
印第安笛（1）环境条件：
通常在离较远、反射物较多的地区，发射机和接收机之间没有直射波路径，存在大量反射波；到达接收天线的方向角随机且在（0~2π）均匀分布；各反射波的幅度和相位都统计独立。
（2）幅度、相位的分布特性：
包络 r 服从瑞利分布，θ在0～2π内服从均匀分布。瑞利分布的概率分布密度如图1所示：
雕刻笔图1 瑞利分布的概率分布密度
