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《通信原理》课程实验报告
1
1 设计题目
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2 设计要求
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3 设计原理
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3.1 DPSK 调 制 ····················································3
3.2 DPSK 解 调 ····················································4
4 设计流程
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5 代码实现
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5.1 基 带 信 号 的 获 取 ···············································5
5.2 差 分 编 码 ·····················································6
5.3 DPSK 调 制 ···················································7
5.4 AWGN 信 道 ···················································8
5.5 限 噪 处 理 ·····················································8
5.6 差 分 相 干 解 调 ·················································9
5.4 AWGN 信 道 ··················································11
5.7 功率谱密度图的绘制
6 测试结果
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6.1 调 制 解 调 正 确 性 的 测 试 ········································12
6.2 系 统 抗 噪 性 能 的 测 试 ··········································14
7 总结
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8 心得体会
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附:完整代码
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2
1) 绘制各阶段信号波形
2) 绘制信号的 PSD
二进制差分相移键控常简称为二相相对调相,记为 2DPSK。它不是利用载波
DPSK 方式即是利用前后相邻码元的相对载波相位值去表示数字信息的一种
0 0 1 1 1 0 0 1 0 1
(a) 模拟调制法
(b) 键控法
3.2 DPSK 解调
4
设计流程如下框图所示,箭头上的信号表示实际传递的信号名称。
bn dn mod modz
BPF
r
Bn
mt
demod
差分相干解调
代码实现如下:
%%%%%%%%%%%% 初始参量定义 %%%%%%%%%%
%载波频率
%基带数据传输速率
T=50;
M=8;
N=9;
sign=randint(1,M);
SNR=20;
%%%%%%%%%%%% 对sign进行T点增样后的基带数字信号 %%%%%%%%%%
bn=[];
for n=1:M
5
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