change ifft code to 'ifft' command

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itsik
itsik 2011-5-20
does someone's know how do i change this code to ifft command? (the ifft part at the code) 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
*_

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回答（3 个）

Harsha Vardhan Rao Avunoori
Are you saying that instead of using a loop to perfrom IFFT you are interested in using ifft() ?
Is this what you mean ?
itsik
itsik 2011-5-20
yes exacly its possable? or maybe there is an option to make fft loop that converte bake the ifft loop?
Harsha Vardhan Rao Avunoori
If you are looking to just find ifft then you can try the direct function available in Matlab ifft()
ifft(your signal/variable);
Hope this will help you

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