Re: [Discuss-gnuradio] Benchmark-rx/tx.py with QPSK modulation

[Boris Danev]

Thank you Bill and Eric.

With the change of the suggested 2 parameters dbpsk and gmsk reception 
appears to be stable.
The dqpsk is still not working properly.
I will try the trunk as well. The 3.2 release seems very close :-).

Regards,
Boris

Bill Stevenson wrote:
> Hi Boris
>
> I think you need to specify costas-alpha as 0.05 and gain-mu as 0.001 
> as your starting point. Hope this would help.
>
> Bill
>
> --- On *Tue, 5/12/09, Eric Blossom /<address@hidden>/* wrote:
>
>
>     From: Eric Blossom <address@hidden>
>     Subject: Re: [Discuss-gnuradio] Benchmark-rx/tx.py with QPSK
>     modulation
>     To: "Boris Danev" <address@hidden>
>     Cc: address@hidden
>     Date: Tuesday, May 12, 2009, 5:34 PM
>
>     On Tue, May 12, 2009 at 03:02:20PM +0200, Boris Danev wrote:
>     > Hi everyone,
>     >
>     > I want to ask if someone has tried the
>     benchmark-rx.py/bencmark-tx.py 
>     > (gnuradio-examples/python/digital) in the the 3.1.3 realease
>     with qpsk 
>     > modulation (-m dqpsk) for transfering user data? I connected 2
>     usrps 
>     > with an RF cable and two laptops (gnuradio 3.1.3 release).
>     > Using gmsk and dbpsk modulation seem to work more or less, even
>     though 
>     > the receiver sometimes misses sent packets. However the dqpsk
>     modulation 
>     > did not work at all. I am always getting garbage in the payload
>     and ok = 
>     > false for the received packets if any. Also, many sent packets
>     were not 
>     > received at all.
>     >
>     > Any comments or suggestions will be appreciated. Thank you in
>     advance.
>     >
>     > Boris
>
>     We've fixed some bugs in the mpsk demod since 3.1.3.  You could either
>     try the trunk, or stay tuned for a few more days when we expect to
>     have the 3.2.0 release out.
>
>     Eric
>
>
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--
Boris Danev
System Security Group, ETH Zurich
IFW C 41.1, 8092 Zurich, Switzeland
E-Mail: address@hidden
Phone: +41 44 632 7669
Fax: +41 44 632 1172