Re: [Discuss-gnuradio] OFDM receiver on USRP2

[Matt Ettus]

On 02/16/2010 02:45 PM, Srinivas wrote:
> Matt,
>
> Thanks for verifying the data rate calculation!
>
> I tried the other solutions that you suggested, namely,
>
> *- increasing the data rate by a factor of 2 or 4
> *It works.
> *
> - modifying the OFDM code to widen the search range* - How do I widen
> the search range ?
> Should I be looking in the "ofdm_sync_" blocks in "blks2impl" folder ?
> If yes, which synchronizer is currently used with ofdm_examples ?
>
> *- locking the usrps to a common reference
> *My usrp2s are located wide apart so I guess this solution is not practical.
>
> Besides, this confirms that the problem is somewhere in the USRP2 board,
> right ? (as I tried swapping the daughter cards & firmware with the
> working pair)


No, this confirms that there is no problem.  Frequency offset is a 
natural part of radio systems.  The software needs to handle it properly.

Matt