Fs value for ifft in ofdm

[Ahmed Alaa]

Dear all,

I was always using ifft function in MATLAB to generate ofdm signal without passing to it a sampling frequency parameter. Know I realized this fact and I'm generating 4k OFDM symbols but confused whether to use fs = 4096 or fs = chip rate or other value?

Thanks.

 

[Communications_Engineer]

if you want 10Mbps with rectangular pulse shaping, then choose Fs as 10MHz or so I think.

 

[Ahmed Alaa]

So this is the chip rate, right?

 

[Communications_Engineer]

Sample rate. Chips are also samples but when we say chip, we usually refer spreading