-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi everybody,
I haven written (and ripped :-) a PI/4 DQPSK modulator, which should be
able to transmit TETRA bursts. For compilation have a look into the
Makefile.
It reads data from stdin and expects one byte for every symbol. The
value should be 0, 1, 2 or 3. 0xff results in silence.
The symbol rate is 250000/14 on USRP1 which is 17857 symbols/s. A more
or less simple demodulator should work without problems (perhaps with
more selfnoise), but a MLSE based RX will most probably not work.
For more "professional" uses we will need an accurate resampler, but I
will throw that one in as time comes :-)
Have fun,
Christian
- --
- ---------------------------------------------------
| maintech # Dipl. Inf (FH) Christian Daniel |
| GmbH ### Otto-Hahn-Str. 15 · D-97204 Höchberg |
- ---------------------------------------------------
| AG Würzburg, HRB 8790 Tax-ID DE242279645 |
- ---------------------------------------------------
|
http://www.maintech.de cd(a)maintech.de |
- ---------------------------------------------------
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)
Comment: Using GnuPG with Mozilla -
http://enigmail.mozdev.org/
iQEcBAEBAgAGBQJNLjLHAAoJEHkgzUIsAWriO2UH/ivlinNO6L/Y74pe8Bf3eKhF
K9bgUKAbowa/AHlKRzJlUU0AvjmAgkDRZOJ9lDqZUyBW5NnoJkxTvRjfq0Deytad
MCwb2jLkN37MLCWju/3io60672G5uMKX4J7N3zDkrLgZKnKesaVJY+NgiLLTkMY1
uh6/ZJ7Fg/snMPXfffMiNo+vG+G9pIMYmzRp3rPaqYL4sSQjyoUWpOoNruDFA+uu
wYf/R1rGo5wWbKdTKAbRCHt3FmTyn61BEtngcyrc30XOZppCjH2oboMpAYmUyU88
bI6pnptMHixoi7skGH0lfD5Fqb5PlUqYOqAaq83LUYmbcv5v7NV51BrikBfk1l0=
=7aiy
-----END PGP SIGNATURE-----