[USRP-users] USRP captured data information

Marcus Müller marcus.mueller at ettus.com
Tue Apr 14 11:34:24 EDT 2015


Hi Alok,
we're always happy to help -- but I don't really understand your
question; you know have this data in matlab, probably as array of
complex values, right?
What do you want to do with that?

Greetings,
Marcus

On 04/14/2015 04:49 PM, alok ranjan via USRP-users wrote:
> 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,
> Marcus
>
>
> 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.
>
>     Regards,
>
>     Alok Ranjan
>
>
>
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