Forum: GNU Radio modulation settings in python

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Yanyan Z. (Guest)
on 2009-03-27 05:36
(Received via mailing list)
Hi all,

We are planning to do different modulation schemes with tunnel.py in
gnuradio-example. In the script there's -m option to change the
modulation.
We use sudo ./tunnel.py --freq 2.44G --bitrate 500k -m dbpsk -v, but the
two
PC can't ping each other after virtual IP setup. This is the output of
the
script (on the sender side):

>>> gr_fir_ccf: using SSE
bits per symbol = 3
Gray code = True
RS roll-off factor = 0.350000
Using TX d'board A: Flex 2400 Tx MIMO B
Tx amplitude     12000
modulation:      d8psk_mod
bitrate:         499.998kb/s
samples/symbol:    2
interp:          384
Tx Frequency:    2.44G

Demodulator:
bits per symbol:     3
Gray code:           True
RRC roll-off factor: 0.35
Costas Loop alpha:   1.50e-01
Costas Loop beta:    5.62e-03
M&M mu:              0.50
M&M mu gain:         1.75e-01
M&M omega:           2.00
M&M omega gain:      7.66e-03
M&M omega limit:     0.01

Receive Path:
Using RX d'board A: Flex 2400 Rx MIMO B
Rx gain:         45
modulation:      d8psk_demod
bitrate:         499.998kb/s
samples/symbol:    2
decim:           192
Rx Frequency:    2.44G
modulation:     d8psk
freq:           2.44G
bitrate:        499.998kb/sec
samples/symbol:   2
Carrier sense threshold: 30 dB

After ifconfig setup, both sender and receiver have output like:
Tx: len(payload) =  192
Tx: len(payload) =  192
Tx: len(payload) =  105

But these two PCs can't ping each other. Are there other parameter
settings
for dbpsk? Thanks a lot!

Yanyan
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