problem with fft

hello i have this program that make ifft for some random vary maybe someone can help me with the fft? thanks

N=10;
fs=1e6;
T=1e-3;

% random signal
bit=randint(20,1);     % 20 bits 0 or 1  1 x 20

% serial-to-parallel converter
par=reshape(bit,2,10);        % 2 x 10  2 bits for sym

% mapper
sym=par'*[2;1];       % multiplay for mapper 00-0 01-1 10-2 11-3
phase=[-3*pi/4,3*pi/4,-pi/4,pi/4];
phase_sym=phase(sym+1); % every sym gets phase for example pi/4 will get '3'

% IFFT
for k=0:N-1
    i=1;
    for t=1/fs:1/fs:T
        x(k+1,i)=cos((2*pi*k*t)/T+phase_sym(k+1))+j*sin((2*pi*k*t)/T+phase_sym(k+1));
       i=i+1;
    end
end

Answer 1

[Arturo Moncada-Torres]

Why don't you use MATLAB's fft and ifft functions directly?

EDIT

For example, if you want it to have a length of 1000, it is very easy:

% Suppose "x" is the signal you want
x_fft = fft(x, 1000);
x_mag = abs(x_fft); % Magnitude
x_pha = angle(x_fft); % Phase

Answer 2

[itsik]

cause i need the length of the fft will be 1000 do u know how i make it? with fft?

Answer 3

[itsik]

maybe someone's know? or how to replace all this code in ifft command?