Maximum block?

Hi,
In my work i have generated random sequenece and then done ofdm
modulation
on it, further i want to use the maximum of the absolutes of ofdm
signal.But
if i look on max block its has two i/p i dont no what its mean coz it
should
take one i/p from the absolute values of ofdm . could any suggest how
can i
get maximum value.

Thanks
Regards


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