chap2_fig6_7.m

无线通讯系统的matlab仿真程序；主要包括同步

% Chap2_Fig6_7.m

clc, close all, clear all

subplot(2,2,1)
x10=3; x20=4;
ti=linspace(0,5,500);
z1=exp(-ti); z2=exp(-2*ti);
a11=2*z1-z2;
a12=z1-z2;
a21=-2*z1+2*z2;
a22=-z1+2*z2;
x1i=a11*x10+a12*x20;
x2i=a21*x10+a22*x20;
plot(x1i,x2i)
hold on
plot(x10,x20,'.r')
xlabel('\itx_{\rm1}')
ylabel('\itx_{\rm2}')
axis([-5 5 -5 5])
grid on
text(-1.5,6,'State Trajectories Starting from Different Initial States')
text(-4,3,'\itx_{\rm1}\rm(0) = 3')
text(-4,1.5,'\itx_{\rm2}\rm(0) = 4')

subplot(2,2,2)
x10=3; x20=-4;
ti=linspace(0,5,500);
z1=exp(-ti); z2=exp(-2*ti);
a11=2*z1-z2;
a12=z1-z2;
a21=-2*z1+2*z2;
a22=-z1+2*z2;
x1i=a11*x10+a12*x20;
x2i=a21*x10+a22*x20;
plot(x1i,x2i)
hold on
plot(x10,x20,'.r')
xlabel('\itx_{\rm1}')
ylabel('\itx_{\rm2}')
axis([-5 5 -5 5])
grid on
text(-4,-1.5,'\itx_{\rm1}\rm(0) = 3')
text(-4,-3,'\itx_{\rm2}\rm(0) = -4')

subplot(2,2,3)
x10=-4; x20=-2;
ti=linspace(0,5,500);
z1=exp(-ti); z2=exp(-2*ti);
a11=2*z1-z2;
a12=z1-z2;
a21=-2*z1+2*z2;
a22=-z1+2*z2;
x1i=a11*x10+a12*x20;
x2i=a21*x10+a22*x20;
plot(x1i,x2i)
hold on
plot(x10,x20,'.r')
xlabel('\itx_{\rm1}')
ylabel('\itx_{\rm2}')
axis([-5 5 -5 5])
grid on
text(1,-1.5,'\itx_{\rm1}\rm(0) = -4')
text(1,-3,'\itx_{\rm2}\rm(0) = -2')

subplot(2,2,4)
x10=-4; x20=2;
ti=linspace(0,5,500);
z1=exp(-ti); z2=exp(-2*ti);
a11=2*z1-z2;
a12=z1-z2;
a21=-2*z1+2*z2;
a22=-z1+2*z2;
x1i=a11*x10+a12*x20;
x2i=a21*x10+a22*x20;
plot(x1i,x2i)
hold on
plot(x10,x20,'.r')
xlabel('\itx_{\rm1}')
ylabel('\itx_{\rm2}')
axis([-5 5 -5 5])
grid on
text(1,3,'\itx_{\rm1}\rm(0) = -4')
text(1,1.5,'\itx_{\rm2}\rm(0) = 2')