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Re: [Discuss-gnuradio] OFDM receiver on USRP2

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] OFDM receiver on USRP2
Date: Tue, 16 Feb 2010 14:47:25 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1

On 02/16/2010 02:45 PM, Srinivas wrote:

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.


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