Ok then what should be my sampling rate if I want to achieve a bandwidth of 16 MHZ with 64 tone OFDM without doing zero padding.
I think i got the answer. In an OFDM system bandwidth is calculated is no.of occupied tones x (sampling rate/total tones)... so for the system employed at texas university the bandwidth was 64 x (100x10^6/400) which comes out to be 16 MHz.
So I guess if i have to achieve 16 Mhz bandwidth without doing any zero padding then I will choose the sampling rate to be 16 MS/s.
Just one last question, does 5421 AWG support only variable sampling rates like can I get precise 16 MS/s sampling rate?
On page 15 and 16 of the PXI 5421 manual we have the following:
Depending which clock you choose you can have up to 1.06 uHz resolution.