Re: [Discuss-gnuradio] USRP2 benchmark_rx.py, benchmark_tx.py, transmit_path_usrp2.py, receive_path_usrp2.py, pick_bitrate.py

[Maher . Ben_Yahmed]

Hi,
I don't have USRP but just USRP2.
I think you should try this part of code :
svn co https://www.cgran.org/cgran/projects/bbn_80211/branches/usrp2_version
there are the bbn_80211b_rx.py & bbn_80211b_tx.py files wich work fine for
many of us between 2 USRP2. I used these options: ./bbn_80211b_tx.py -f
2.4G -e eth1  -i 24 -r 20 and ./bbn_80211b_rx.py -f 2.4G -v

try them and tell us about the results.

Ben Yahmed


>
> Hi,
>
> I have already tried to use USRP2 as transmitter and USRP1 as receiver
> using
> transmit_path_usrp2 file for usrp2. However I am not able to figure out
> the
> bit rate, interpolation and decimation rate to be set for successful
> communication. I am not able to catch the packets using USRP1. Were you
> able
> to transmit using USRP2 and receive using USRP1. If yes, please let me
> know
> what frequency you used, what were the command line parameters and also if
> you made any changes in the python code for either usrp1 or usrp2.
>
> Thanks for your help in advance.
>
> Kushal
>
>
> Ben Yahmed wrote:
>>
>> Hi,
>> I replaced your USRP2'mac adress with mine and tryed the code but no
>> received packet even with USRP2. I suggest that you use the
>> usrp2_version
>> branch code to transmit packets with USRP2 and try to catch them with
>> USRP1 since this code works fine for many of us.
>>
>> Ben Yahmed
>>
>>>
>>> Hi,
>>>
>>> I don't have two usprp2. So I am trying to communicate  between usrp1
>>> and
>>> usrp2. Moreover, in the transmit_path.py file I have hard coded my
>>> usrp2's
>>> mac address so you would have to replace it with yours before using it.
>>> If
>>> there are any other problems with the code then please let me know
>>>
>>> Smith
>>>
>>>
>>> Ben Yahmed wrote:
>>>>
>>>> Hi,
>>>> Did you try to send and receive packets between 2 USRP2? I tryed but
>>>> without any result. Are you sure that it's working correctly? I will
>>>> have a look to the code in more details and tell you if something will
>>>> work.
>>>>
>>>> Ben Yahmed
>>>>
>>>>
>>>> Smith L. wrote:
>>>>> Hi,
>>>>>
>>>>> This is what I get when I run benchmark _tx.py and benchmark_rx.py
>>>>> respectively on USRP2 with transmit_path_usrp2.py and
>>>>> receive_path_usrp2.py
>>>>> respectively:
>>>>>
>>>>> benchmark_tx.py:-
>>>>>
>>>>> address@hidden:~/gnuradio/gnuradio-examples/python/digital$ sudo
>>>>> ./benchmark_tx.py -f 2400M -v
>>>>> usrp2::ctor reset_db failed
>>>>> usrp2::ctor set_rx_gain failed
>>>>> usrp2::ctor set_tx_interp failed
>>>>> usrp2::ctor set_rx_scale_iq failed
>>>>>
>>>>>>>> gr_fir_fff: using SSE
>>>>>>>>
>>>>> bits per symbol = 1
>>>>> Gaussian filter bt = 0.35
>>>>> Using TX d'board 43
>>>>> Tx amplitude     12000
>>>>> modulation:      gmsk_mod
>>>>> bitrate:         500kb/s
>>>>> samples/symbol:    2
>>>>> interp:          100
>>>>> Tx Frequency:    2.4G
>>>>> address@hidden:~/gnuradio/gnuradio-examples/python/digital$
>>>>>
>>>>> benchmark_rx.py:-
>>>>>
>>>>> address@hidden:~/gnuradio/gnuradio-examples/python/digital$ sudo
>>>>> ./benchmark_rx.py -f 2400M -v
>>>>> usrp2::ctor reset_db failed
>>>>>
>>>>>>>> gr_fir_fff: using SSE
>>>>>>>>
>>>>> bits per symbol = 1
>>>>> M&M clock recovery omega = 2.000000
>>>>> M&M clock recovery gain mu = 0.175000
>>>>> M&M clock recovery mu = 0.500000
>>>>> M&M clock recovery omega rel. limit = 0.005000
>>>>> frequency error = 0.000000
>>>>>
>>>>> Receive Path:
>>>>> Using RX d'board 39
>>>>> Rx gain:         35
>>>>> modulation:      gmsk_demod
>>>>> bitrate:         500kb/s
>>>>> samples/symbol:    2
>>>>> decim:           100
>>>>> Rx Frequency:    2.4G
>>>>>
>>>>>
>>>>> Now the same thing for usrp1 but using transmit_path.py and
>>>>> receive_path.py
>>>>> which is already provided in gnuradio:
>>>>>
>>>>> benchmark_tx.py:-
>>>>>
>>>>> address@hidden:~/gnuradio/gnuradio-examples/python/digital$ sudo
>>>>> ./benchmark_tx.py -f 2400M -v
>>>>>
>>>>>>>> gr_fir_fff: using SSE
>>>>>>>>
>>>>> bits per symbol = 1
>>>>> Gaussian filter bt = 0.35
>>>>> Using TX d'board A: Flex 2400 Tx MIMO B
>>>>> Tx amplitude     12000
>>>>> modulation:      gmsk_mod
>>>>> bitrate:         500kb/s
>>>>> samples/symbol:    2
>>>>> interp:          128
>>>>> Tx Frequency:    2.4G
>>>>> address@hidden:~/gnuradio/gnuradio-examples/python/digital$
>>>>>
>>>>> benchmark_rx.py:-
>>>>>
>>>>> address@hidden:~/gnuradio/gnuradio-examples/python/digital$ sudo
>>>>> ./benchmark_rx.py -f 2400M -v
>>>>>
>>>>>>>> gr_fir_fff: using SSE
>>>>>>>>
>>>>> bits per symbol = 1
>>>>> M&M clock recovery omega = 2.000000
>>>>> M&M clock recovery gain mu = 0.175000
>>>>> M&M clock recovery mu = 0.500000
>>>>> M&M clock recovery omega rel. limit = 0.005000
>>>>> frequency error = 0.000000
>>>>>
>>>>> Receive Path:
>>>>> Using RX d'board A: Flex 2400 Rx MIMO B
>>>>> Rx gain:         45
>>>>> modulation:      gmsk_demod
>>>>> bitrate:         500kb/s
>>>>> samples/symbol:    2
>>>>> decim:            64
>>>>> Rx Frequency:    2.4G
>>>>>
>>>>> I am using the same pick_bitrate.py file that is already provided in
>>>>> gnuradio. As it can be seen that both usrp systems have the default
>>>>> bit
>>>>> rate
>>>>> irrespective of whether it acts as receiver or transmitter. My
>>>>> concern
>>>>> is
>>>>> with the interpolation and decimation. Do I need to make changes to
>>>>> the
>>>>> pick_bitrate.py file for USRP2? If yes, then what kind of changes. I
>>>>> also
>>>>> observed that even though USRP2 shows a bit rate of 500kbps, however
>>>>> I
>>>>> believe that its transmitting too fast which does not allow USRP1 to
>>>>> receive
>>>>> correctly.I would greatly appreciate any help in this matter.
>>>>>
>>>>> Thanks in advance.
>>>>>
>>>>> Smith
>>>>>
>>>>> Eric Blossom wrote:
>>>>>
>>>>>> On Tue, Apr 14, 2009 at 01:48:21PM -0700, Smith L. wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I am trying to establish communication between USRP2 and USRP1. I
>>>>>>> am
>>>>>>> using
>>>>>>> RFX2400 daughterboard. I am using Ubuntu 8.10. I am using the svn
>>>>>>> version
>>>>>>> of
>>>>>>> GNU Radio. I dont know the revision number. I am not able to
>>>>>>> receive
>>>>>>> anything on USRP2 when USRP1 is transmitting and vice versa. The
>>>>>>> python
>>>>>>> codes for USRP2 work perfectly fine. I guess there is some problem
>>>>>>> with
>>>>>>> the
>>>>>>> ADC and DAC incompatibility (interpolation and decimation) between
>>>>>>> USRP2
>>>>>>> and
>>>>>>> USRP1. I am attaching all the necessary files that I am using
>>>>>>> currently.
>>>>>>> I
>>>>>>> would appreciate if someone can look at these files and help me to
>>>>>>> sort
>>>>>>> out
>>>>>>> the problem.
>>>>>>>
>>>>>> My guess is that the two are not running at the same bit rate.
>>>>>> You haven't provided us much to go on.
>>>>>>
>>>>>> Please see http://gnuradio.org/trac/wiki/ReportingErrors, and try
>>>>>> asking again.
>>>>>>
>>>>>> Eric
>>>>>>
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
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