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>-----------------------------------------------------------------
> exa011002_rand for example 1.10.2
> to generate the white noise signal u(n) with uniform distribution
> and power p;
> 产生均匀分布的白噪信号，使均值为0，功率为p
>-----------------------------------------------------------------
clear;
p=0.01;
N=50000;
u=rand(1,N);
u=u-mean(u);
a=sqrt(12*p);
u1=u*a;
power_u1=dot(u1,u1)/N
subplot(211)
plot(u1(1:200));grid on;
ylabel('u(n)')
xlabel('n')