通信原理实验六创新实验班

1、实验六DQPSK 调制信科院（院、系）创新实验 专业创新实验 班 通信原理课学号 201320224320 实验日期2015-5-5教师评定(1) 部分一：QPSK 调制一、实验目的1熟悉 DQPSK 调制原理。2掌握编写 DQPSK 调制程序的要点。二、实验内容1根据 DQPSK 调制原理，设计源程序代码。2通过仿真给定信号的调制波形。三、实验原理四、程序设计五、设计流程六、源程序代码at N=1,0,0,1,1,1,0,0;0:0.1:10;leng);%asubplot(2,1,1);stem(a);title();for i=1:2:Nifi=1%i1i1i-2i-1ifif a(i)

2、 = 0 & a(i+1) = t = i-1:0.01:i+1;s = sin(pi*t+pi*1/2);end0if a(i) = 0 & a(i+1) = t = i-1:0.01:i+1;s = sin(pi*t);end1if a(i) = 1 & a(i+1) = t = i-1:0.01:i+1;s = sin(pi*t+pi*3/2);end1if a(i) = 1 & a(i+1) = 0ts= i-1:0.01:i+1;= sin(pi*t+pi);endelse%i=3if a(i) = 0 & a(i+1) =%if if a(i-2)=0 & a(i-1)=0t =

3、i-1:0.01:i+1;s = sin(pi*t);end0if a(i-2)=0 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi*1/2);endif a(i-2)=1 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi);endif a(i-2)=1 & a(i-1)=0 t = i-1:0.01:i+1;s = sin(pi*t+pi*3/2);endendif a(i) = 0 & a(i+1) = 1 if a(i-2)=0 & a(i-1)=0t = i-1:0.01:i+1;s = sin(pi*t);

4、endif a(i-2)=0 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi*1/2);endif a(i-2)=1 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi);endif a(i-2)=1 & a(i-1)=0 t = i-1:0.01:i+1;s = sin(pi*t+pi*3/2);endendifa(i) = 1 & a(i+1) = 1 if a(i-2)=0 & a(i-1)=0t = i-1:0.01:i+1;s = sin(pi*t);endif a(i-2)=0 & a(i-1)=1 t =

5、 i-1:0.01:i+1;s = sin(pi*t+pi*1/2);endif a(i-2)=1 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi);endif a(i-2)=1 & a(i-1)=0 t = i-1:0.01:i+1;s = sin(pi*t+pi*3/2);endendif a(i) = 1 & a(i+1) = 0 if a(i-2)=0 & a(i-1)=0t = i-1:0.01:i+1;s = sin(pi*t);endif a(i-2)=0 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi*1/2);endif a(i-2)=1 & a(i-1)=1 t = i-1:0.01:i+1;s = sin(pi*t+pi);endif a(i-2)=1 & a(i-1)=0 t = i-1:0.01:i+1;s