Re: [Discuss-gnuradio] OFDM Updates

[Dan Halperin]

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Shravan Rayanchu wrote:
> Basically, I seem to completely lose some of the packets in the air.
> Of the packets I receive, almost all the packets are received
> correctly. Initially, the error rate was too high (The packets were
> getting lost and also among the packets received, lot of them were in
> errors), so I increased tx-amplitude to ~3000.
> 
> Am I using the right version of the code ? Is the tarball release
> better to use ? Can you please let me know if there are any parameters
> which I need to change ?

Tom mentioned an existing problem in the email you replied to, which you
didn't address in your response. Could that be the problem or have you
ruled it out?

For debugging these types of errors, I really do suggest (from
experience!) that you start saving the outputs of the intermediate
stages to disk and seeing what they look like. It might require some
understanding of the receiver, but then again you probably want that
knowledge anyway...

It's likely (as I found with older versions of the DBPSK code, for
instance) that some of the synchronization and/or timing algorithms
aren't working in your setup. But maybe there's lots of cochannel
interference. Maybe the RSSI is low. Maybe the frequency offset of your
daughterboards is too large to be handled by the PLLs...

The way that you can tell these things is by analyzing the output --
it's really hard for Tom to debug it offline. And he can't test his code
in all possible environments.

- -Dan
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