Re: [Discuss-gnuradio] OFDM on USRP2

[Marcus D. Leech]

On 20/06/2011 10:05 AM, vanITA1082 wrote:
> I am going more deeply into the OFDM example, however I cannot figure out
> which is the bit rate of the usrp.
> I mean, I know and I can set the bit rate of my application but how fast the
> packets are sent out by the usrp?
> How can I evaluate the throughput on the wireless link?
>
> Thanks
>
> Vanessa
The USRP knows nothing about packets or modulation or any of the 
higher-level concepts you seek.

The USRP/USRP2/N2XX are, conceptually, digitizers that digitize the 
baseband output of the RF chain, and present it to the
  host at a fixed sample rate.  Conversely, they take digital samples 
from the host, and convert them into baseband analog signals
  for the RF hardware to transmit.

Any given modulation waveform (whether it's OFDM, or BPSK, or NBFM, or 
whatever) occupies a certain *bandwidth*, and you chose
  the sample rate to accomodate the bandwidth of the signal.