Re: [Discuss-gnuradio] OFDM receiver on USRP2

[Srinivas]

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)

Thanks,
Srinivas

On Sun, Feb 14, 2010 at 3:25 AM, Matt Ettus <address@hidden> wrote:

That formula will give you the number of occupied tones per second. You
need to multiply by the number of bits per tone to get bps. If you are
using BPSK, multiply by 1. If using QPSK, you'll need to multiply by 3,
8PSK by 3, etc.

I meant to say:

BPSK - multiply by 1
QPSK - mult by 2 (not 3 like I said above)
8PSK - mult by 3

sorry for the confusion.

Matt

-- 
Srinivas
WINLAB, Rutgers University
New Jersey