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802.11a long traning preambles

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kepani

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c = 1+1i;
Ws = zeros( 1, 64 );
S = sqrt(13/6)*[ 0 0 c 0 0 0 -c 0 0 0 c 0 0 0 -c 0 0 0 ...
-c 0 0 0 c 0 0 0 0 0 0 0 -c 0 0 0 -c 0 0 0 c 0 0 0 ...
c 0 0 0 c 0 0 0 c 0 0 ];
Ws(7:59) = S;
xs = ifft( fftshift(Ws) );

As from above, how to do cyclic extension of xs to get 160 samples? Moreover; generate the 802.11a long preamble in matlab
 

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