I tried almost all things. I also tried without -s.
Well, the current situation is I am getting the three kinds of IQ data.
1. both of the IQ valid signal is achieved.
2. Either I or Q is valid, the other one is a dead signal (showing '0',
zero values)
3. Both of them are dead signal ('0' values).I dont know why I am getting the zero. There should be a value even for noise. It should not be zero. Any idea? On Wed, Nov 23, 2011 at 10:10 AM, Tom Rondeau <trondeau1...@gmail.com>wrote: > On Mon, Nov 21, 2011 at 6:31 AM, Hasan Rajib Imam <shuvo1...@gmail.com>wrote: > >> Hello Tom & Nick, >> >> Thanks for your help. I am here to ask another question. >> >> I am using the following command >> sudo python usrp2_rx_cfile.py -f 800M -N 1000 -d 100 -s -v output.dat >> >> After that, I converted the .dat file using octave command >> (read_complex_binary). >> >> However, the values I am getting are ambiguous. >> I am getting lots of 0 (zeros) and lots of Nan (dont know what does it mean >> though)..I have no idea about it. >> >> Here is the snapshot of what I get. I would really appreciate if somebody >> can give any idea about this. Thank you. >> >> > Doesn't the -s option output shorts? When you use the read_complex_binary, > it's expecting it as complex floats (32-bit float I, 32-bit float Q). Try > capturing without the -s and try again. > > You might also have to turn up the receiver gain. > > Tom > > > >> >> ------snapshot----------- >> (9.183409485952689e-41,0) >> (NaN,NaN) >> (NaN,NaN) >> (NaN,NaN) >> (NaN,NaN) >> (NaN,9.183409485952689e-41) >> (NaN,NaN) >> (NaN,9.183409485952689e-41) >> (NaN,NaN) >> (NaN,NaN) >> (9.183409485952689e-41,0) >> (NaN,9.183409485952689e-41) >> (9.183409485952689e-41,0) >> (9.183409485952689e-41,9.183409485952689e-41) >> (NaN,NaN) >> (9.183409485952689e-41,0) >> (NaN,NaN) >> (0,9.183409485952689e-41) >> (NaN,NaN) >> (NaN,9.183409485952689e-41) >> (NaN,NaN) >> (NaN,9.183409485952689e-41) >> (0,9.183269356106256e-41) >> (9.183409485952689e-41,9.183409485952689e-41) >> (9.183409485952689e-41,0) >> (9.183409485952689e-41,0) >> (9.183409485952689e-41,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> (0,0) >> >> >> >> On Sat, Nov 19, 2011 at 12:16 AM, Tom Rondeau <trondeau1...@gmail.com>wrote: >> >>> On Thu, Nov 17, 2011 at 6:41 PM, Hasan Rajib Imam >>> <shuvo1...@gmail.com>wrote: >>> >>>> Hello Nick, >>>> >>>> Thanks for your reply. >>>> >>>> >>>> "you can use Gnuradio blocks such as the decimating FIR filter to >>>> decimate additionally by however much you like." >>>> >>>> Could you please tell me how can I do the above thing? Actually I am >>>> very new to gnuradio. I will really appreciate your help. >>>> >>>> Thanks. >>> >>> >>> Hasan, >>> >>> You can use the gr.fir_filter_XXX(decim, taps) or >>> gr.fft_filter_XXX(decim, taps). The taps are generally defined using >>> gr.firdes.low_pass_2(gain, sample rate, bw, transition, attenuation, >>> window). The 'decim' parameter for these blocks is an integer. >>> >>> fft_filter: >>> http://gnuradio.org/doc/doxygen/classgr__fft__filter__ccc.html >>> >>> fir_filter: >>> http://gnuradio.org/doc/doxygen/classgr__fir__filter__ccc.html >>> >>> firdes: >>> http://gnuradio.org/doc/doxygen/classgr__firdes.html >>> >>> Tom >>> >>> >>> >>> >>> >>>> >>>> On Fri, Nov 18, 2011 at 1:29 AM, Nick Foster <n...@ettus.com> wrote: >>>> >>>>> On Thu, Nov 17, 2011 at 8:28 AM, Nick Foster <n...@ettus.com> wrote: >>>>> > On Thu, Nov 17, 2011 at 2:33 AM, hasanimam <shuvo1...@gmail.com> >>>>> wrote: >>>>> >> >>>>> >> Hello all, >>>>> >> >>>>> >> I am here once again and would like to bother you a bit. >>>>> >> I am using the usrp2_rx_cfile.py command to get the IQ data from >>>>> usrp2. I am >>>>> >> using the following command >>>>> >> >>>>> >> sudo python usrp2_rx_cfile.py -f 800M -d 496 -s -v -N 10 >>>>> >> /home/gnuradio4/Desktop/observed_data/test.dat >>>>> >> >>>>> >> And I am getting the following output: >>>>> >> >>>>> >> Network interface: eth0 >>>>> >> USRP2 address: 00:50:c2:85:35:7d >>>>> >> Using RX d'board id 0x0053 >>>>> >> Rx gain: 15.75 >>>>> >> Rx baseband frequency: 800M >>>>> >> Rx DDC frequency: 0 >>>>> >> Rx residual frequency: 0 >>>>> >> Rx decimation rate: 512 >>>>> >> Rx sample rate: 195.312k >>>>> >> Receving 10 samples >>>>> >> Writing 16-bit complex shorts >>>>> >> Output filename: /home/gnuradio4/Desktop/observed_data/test.dat >>>>> >> >>>>> >> In the above, it shows that the sample rate is 195.312k. I want to >>>>> raise >>>>> >> this rate but it seems that decimation rate has a limit upto 512 so >>>>> i cant >>>>> >> do that. >>>>> >> Can you suggest me any other way to raise the sample rate? >>>>> >> In fact I want the time difference between each sample to be around >>>>> 100us, >>>>> >> but sample rate 195k gives me 5us. >>>>> > >>>>> > "Decimation" means the ratio by which the 100MHz main clock is >>>>> > divided. 100MHz / 512 = 195.312kHz. Try using a lower decimation. >>>>> >>>>> Oh, I think I misunderstood your question, sorry -- you don't want to >>>>> raise the SAMPLE rate, you want to raise the DECIMATION. In that case, >>>>> you can use Gnuradio blocks such as the decimating FIR filter to >>>>> decimate additionally by however much you like. >>>>> >>>>> --n >>>>> >>>>> > >>>>> > --n >>>>> > >>>>> >> >>>>> >> Thank you. >>>>> >> >>>>> >> >>>>> >> -- >>>>> >> View this message in context: >>>>> http://old.nabble.com/usrp2_rx_cfile.py-issue-tp32860995p32860995.html >>>>> >> Sent from the GnuRadio mailing list archive at Nabble.com. >>>>> >> >>>>> >> >>>>> >> _______________________________________________ >>>>> >> Discuss-gnuradio mailing list >>>>> >> Discuss-gnuradio@gnu.org >>>>> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >> >>>>> > >>>>> >>>> >>>> >>>> >>>> -- >>>> Hasan Rajib Imam >>>> University of Electro-Communication, Japan >>>> 1st year Masters Student >>>> Email: shuvo1...@gmail.com >>>> Contact No: (+81)80-5004-5931 >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>> >> >> >> -- >> Hasan Rajib Imam >> University of Electro-Communication, Japan >> 1st year Masters Student >> Email: shuvo1...@gmail.com >> Contact No: (+81)80-5004-5931 >> > > -- Hasan Rajib Imam University of Electro-Communication, Japan 1st year Masters Student Email: shuvo1...@gmail.com Contact No: (+81)80-5004-5931
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