[USRP-users] high packet loss tunnel.py

vegihat vegihat vegihatduke at gmail.com
Tue Jun 5 09:04:24 EDT 2012


Well i solved the below problem by using different freq for transmit and
receive

what i do is

computer A
#./tunnel.py --rx-freq 2.41G --tx-freq 2.5G --bitrate 250k  -m gmsk
--tx-amplitude=0.2 --tx-gain=50  --rx-gain=50 -c 60

computer B
#./tunnel.py --tx-freq 2.41G --rx-freq 2.5G --bitrate 250k  -m gmsk
--tx-amplitude=0.2 --tx-gain=50  --rx-gain=50 -c 60


with this setup all ok, for example i tried to sent a jpp image from B to A
using netcat tool and i have success.

But i have a little problem. For this setup and for distance 30cm between
two USRP i have low packet loss but when i increase the distance,for
example 1m, i have 100% packet loss. Why :\???????

2012/5/29 vegihat vegihat <vegihatduke at gmail.com>

> Hello again :)
>
> Well,after many experiments i have achieved a ping of  12% packet loss
> from machine A to machine B but 100% packet loss from machine B to machine A
>
> what i give on both machines is
>
> $ sudo su
> # ./tunnel.py -f 2.41G --bitrate 250k -m gmsk --tx-amplitude=0.2
> --tx-gain=50  --rx-gain=50 -c 50
>
> how could i archieve a full duplex communication?
>
> 2012/5/15 Josh Blum <josh at ettus.com>
>
>>
>>
>> On 05/15/2012 05:36 AM, vegihat vegihat wrote:
>> > hello folks,
>> >
>> >
>> > I have tried to set TCP/IP over GNU Radio between 2 USRP1 with RFX2400
>> > daughterboards using the example
>> > gnuradio/examples/digital/narrowband/tunnel.py
>> >
>> > i give
>> > ./tunnel.py -f 2500e6 --bitrate 500k -v --tx-amplitude=1 --tx-gain=20000
>> > --rx-gain=20000 -c 50
>> >
>>
>> watch out for --tx-amplitude=1, the float values are +/-1.0. To avoid
>> clipping, I would half this value while you are debugging.
>>
>> > and i take a ~80% packet loss.
>> >
>> >
>> > How to reduce the high packet loss?
>> >
>> > if you want additional info , tell me.
>> >
>> > ps: i have attached the output of uhd_usrp_probe
>> >
>> >
>>
>> I recommend to observe the transmit spectrum. Is it at acceptable output
>> power level and RF frequency.
>>
>> Same for the RX signal. Is the power level good, and the signal at the
>> expected baseband frequency?
>>
>> -josh
>>
>> >
>> >
>> > _______________________________________________
>> > USRP-users mailing list
>> > USRP-users at lists.ettus.com
>> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>> _______________________________________________
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>>
>
>
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