trying to make fft for this ifft code

Question

itsik 2011-5-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/7952-trying-to-make-fft-for-this-ifft-code

hello this code simulated for ifft im trying to do the inverse for find the fft but i failed can u help me? thanks!!

clear all
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