[Discuss-gnuradio] modulation settings in python

[yyzhuang]

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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