Modulation settings in python


#1

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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