Cirkic
4380042cf8
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4037 818b1a75-f10b-46b9-bf7c-635c3b92a50f
24 lines
672 B
Matlab
24 lines
672 B
Matlab
function [carrierdata, s]=genrandpskseq(N,M,amp)
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if(mod(N,640)~=0)
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error('The sequence length must be divisible with 640.');
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endif
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s = zeros(N,1);
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MPSK=exp(sqrt(-1)*([1:M]*2*pi/M+pi/M));
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% OFDM sequence with 512 FFT using randomly
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% generated 4-QAM and 128 cyclic prefix
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carrierdata=zeros(120,301);
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for i=0:(N/640-1)
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datablock=MPSK(ceil(rand(301,1)*M));
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for j=1:301
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carrierdata(i+1,j)=datablock(j);
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endfor
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fblock=[0 datablock(1:150) zeros(1,210) datablock(151:301)];
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ifblock=ifft(fblock,512);
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% Adding cycl. prefix making the block of 640 elements
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block = [ifblock(end-127:end) ifblock];
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s([1:640]+i*640)=floor(amp*block);
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endfor
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endfunction |