fig_example_z.m

Ultra.Wideband.Signals.and.Systems.in.Communication.Engineering.eBook-kB代码

clear all;
a=.9;
it=0;
for t=0:1:10;
    it=it+1;
    fd1(it)=a^t;
end;
figure (1);
plot(0:1:10,fd1,':gs','LineWidth',2,...
                'MarkerEdgeColor','k',...
                'MarkerFaceColor','g',...
                'MarkerSize',7)
grid on;hold on;
it=0;
for t=-10:1:-1;
    it=it+1;
    fd2(it)=-a^t;
end;
plot(-10:1:-1,fd2,':ro','LineWidth',2,...
                'MarkerEdgeColor','k',...
                'MarkerFaceColor','r',...
                'MarkerSize',8)
axis([-10 10 -3 1.5]);
xlabel('Time, sec');ylabel('Discrete-time functions');grid on;
legend('a^n u(n)','-a^n u(-n-1)');