## Hi, everyone! i need help to make this , instead of getting a matrix FTTx ( 4x8) i need to get a column vector (1x32) with the same values but i iam not able to do it , thank you

### mina massoud (view profile)

on 9 May 2019
Latest activity Edited by dpb

### dpb (view profile)

on 9 May 2019
Lx=20;
N=4;
P=8;
L=2;
xBuff=zeros(N,1);
b=0.5;
x = filter(sqrt(1-b^2), [1 -b], (1/(sqrt(4)))*(randn(Lx,1)) );
FFTX = zeros(N,P); %%%%%%% FFTX = zeros(N*P,1);
for k = 1 : L : 20 % k=1 ,2,3 .............. etc
nn = k : k + L - 1; %1:2 , 2:3 , 3:4 ; 4:5.............etc
xBuff(1 : N, :) = [ xBuff(L+1 : N, : ) ; x(nn, :) ];
FFTX(:,2:P) = FFTX(:,1:P-1);
FFTX(:,1) = fft(xBuff);
end

mina massoud

### mina massoud (view profile)

on 9 May 2019
% this is my code but the answer is not the same , i don't know why
Lx=20;
N=4;
P=8;
L=2;
xBuff=zeros(N,1);
b=0.5;
x = filter(sqrt(1-b^2), [1 -b], (1/(sqrt(4)))*(randn(Lx,1)) );
FFTX = zeros(N*P,1);
for k = 1 : L : 20 % BlkSize = KK*F.L, KK integer
nn = k : k + L - 1; %1:2 , 2:3 , 3:4 ; 4:5.............etc
xBuff(1 : N, :) = [ xBuff(L+1 : N, : ) ; x(nn, :) ];
%FFTX(:,2:P) = FFTX(:,1:P-1);
FFTX(2:P,1) = FFTX(1:P-1,1);
FFTX(1:4,1) = fft(xBuff);
end

R2018b