compute the frequency spectrum using fft function (512 points) and generate a 4_by_2 plot such as :
the first column displays the window function in time domain 0<=n<=M-1 , the second column displays the window function in frequency domain with the correct frequency scaling in [0,fs/2].
consider a sinusoidal mixture x(n) given as:
x(n)=A1sin(w1nTs+O1)+A2sin(w2nTs+O2)+v(n)
where A1=0.1,A2=1,w1=2ᴨ0.1,w2=2ᴨ0.15,Ts=1,O1,O2 distributed between [0,2ᴨ],v(n)is a zero-mean white Gaussian noise process of variance Q^2=0.01.
clear,clc,close all
A1= 0.1;
A2= 1;
w1= 2*pi*0.1;
w2= 2*pi*1;
Ts= 1;
N= 512;
K= ;
sgm= ;
n=repmat([0:N-1].',1,k)
phi1=repmat(rand(1,k)*2*pi,N,1) ;
phi2=repmat(rand(1,k)*2*pi,N,1) ;
x=A1*sin(w1*n*Ts+phi1)+A2*sin(w2*n*Ts+phi2)+sgm*randn(N,k) ;
