[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] GMSK Over the Air
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] GMSK Over the Air |
Date: |
Tue, 28 Feb 2012 09:49:12 +0100 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Mon, Feb 27, 2012 at 12:12:52PM -0800, justynnuff wrote:
> The Problem: Although I can see the GMSK signal on the Rx end off of the
> USRP, nothing is produced at the output of the packet decoder. The BT param
> on the GMSK mod block is ~1, the samples per symbol is 8, and almost
> everything else is default. Is there something I'm missing, or does this
> block just not work in an over-the-air scenario?
Hi justynnuff,
it should work (and I've tried it). I don't have a setup right here, so
I can't give you a working example, but here's some input:
- I definitely used different params (probably bt=.3 and sps=2),
although I don't know off the top of my head if that could cause
trouble.
- The standard sync was a bit flaky (e.g. I never got it working on GSM
bursts). I had to tune pretty precisely to start with, and then timing
sync using the M&M didn't work out that well.
It does, however, work with the benchmark_* examples, which you should
definitely read (if you haven't done so). It's probably just a matter of
setting the sync params correctly.
MB
--
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)
Dipl.-Ing. Martin Braun
Research Associate
Kaiserstraße 12
Building 05.01
76131 Karlsruhe
Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu
KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association
pgpC3p_BtBiyu.pgp
Description: PGP signature