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Re: [Discuss-gnuradio] Effect of samples_per_symbol on benchmark_qt_loop

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] Effect of samples_per_symbol on benchmark_qt_loopback2.py
Date: Tue, 7 Dec 2010 23:27:54 -0500

On Tue, Dec 7, 2010 at 12:42 AM, Ben Reynwar <address@hidden> wrote:
> When I run gnuradio/gnuradio-examples/python/digital/benchmark_qt_loopback2.py
> I get a strange dependence on samples_per_symbol.
> I would naively have expected that the more samples per symbol the
> better, however:
> python benchmark_qt_loopback2.py --samples_per_symbol 10
> produces no errors
> whereas
> python benchmark_qt_loopback2.py --samples_per_symbol 11
> produces lots of errors
> Does anyone have any idea what's going on here?
> Cheers,
> Ben

That's a very large number of samples per symbol. I know I tested up
to 10, but more than that's pretty excessive. Ok, more than 2 is
excessive, really. Off the top of my head, I can't think of exactly
what might be going wrong here, but you should really never need to
use that many samples per symbol, anyway.


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