gwn.m

1.对染噪doppler信号进行小波包3层分解：分解层次j=1,2时

function B = GWN(n,beta)
%  GWN- Generation of Gaussian White Noise
%  Usage
%    B=GWN(n,beta)
%  Inputs   
%    n	 size of datas
%    beta	standard deviation
%  Outputs
%    B	resulting noise
%

B=randn(1,n);
B = B/std(B);             
B = B - mean(B);     %保证产生的随即序列均值为零
B=B*beta;            %保证产生的随即序列方差为beta