[USRP-users] USRP captured data information

alok ranjan alokranjan007 at hotmail.com
Tue Apr 14 10:49:06 EDT 2015

Dear Marcus,

Thank you so much for your quick response.

Sorry for the mistake committed from my side. Yes, You are right those captured data is in I/Q complex format.

Actually, I am trying to do some post data processing on those captured I/Q samples like curve fitting analysis in MATLAB thats why converted those complex binary file in .mat format.   And I am initially not able to get that how those information is useful to plot .

However, I have plotted PSD and FFT using gr_plot_psd_c and gr_plot_fft.  

It might  not a place to ask this question, but If any one has any idea then please share your experience.

Any help is appreciated.

Best Regards,

Alok Ranjan
Date: Tue, 14 Apr 2015 16:20:01 +0200
To: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] USRP captured data information
From: usrp-users at lists.ettus.com

    Hi Alok,


    I must admit that I'm really a bit confused about your question: You
    seem to know that the data is I/Q complex samples, but you ask what
    they are. It's complex baseband samples, contained in 32-bit floats
    (per imag and real part).


    Best regards,




    On 04/14/2015 03:58 PM, alok ranjan via
      USRP-users wrote:

      Hello All list members,



        I am new to SDR and USRP platform. 


        I have two USRP1 with the DB WBX for transmission and reception
        of data.


        I used benchmark_tx.py script and benchmark_rx.py script for
        transmission and reception purpose with all the parameters.


        I captured the transmitted signals using the command
        uhd_rx_cfile.   As the captured data  is in the binary format
        (complex 32, , i+j*Q), I converted the binary data into .mat
          file using octave.



        I would like to know as the data is captured and stored in file,
        which kind of information it does contain with it.  Is it a RSSI
        value  at receiver or something else?  


        How can I know that what is X and Y in the captured file .


        Please suggest and guide me so that i can further do data
        processing and analysis.



        Looking forward for your response.




        Alok Ranjan




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