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OFDM Normailzation Problem

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greatestcon

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In 802.11a Standard, the short preamble is defined as

sqrt(13/6)*ifft( [ 0 0 1+1i 0 0 0 -1-1i 0 0 0 ...
1+1i 0 0 0 -1-1i 0 0 0 -1-1i 0 0 0 1+1i 0 0 0 ...
0 0 0 0 -1-1i 0 0 0 -1-1i 0 0 0 1+1i 0 0 0 ...
1+1i 0 0 0 1+1i 0 0 0 1+1i 0 0 ]

How does this sqrt(13/6) come? I just know it is used for power normalization, but how can I compute it?

Thanks for help!!
 

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