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

[Bill Stevenson]

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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