If you are planning to use GNU Radio or some other signal processing package, take a look at frequency translating filters. It is relatively straightforward to do this.

On 02/09/2018 11:22 AM, Steven Knudsen via USRP-users wrote:
Hi Mathieu,

You can certainly use the UHD to get the signal of interest, but what you are asking is really a question of signal processing and independent of the UHD and any USRP you may be using.

I suggest you focus on the signal processing problem of separating two closely-spaced signals and maybe do some pencil and paper work and then simulation using MATLAB, Octave, SciLab, or even plain old C/C++. Whatever you come up with you can then plug into a UHD-based program that receives samples. Personally, I’d just copy one fo the receive examples and start modifying it to accept your algorithms.

If you have not already found it, a good place to start is this book <http://www.dspguide.com/pdfbook.htm>

As a person new to this list, please consider that its focus is on things directly related to USRPs and UHD. Your question is probably better posed at Signal Processing Stack Exchange <https://dsp.stackexchange.com/>

good luck,

steven



Steven Knudsen, Ph.D., P.Eng.
www.techconficio.ca

www.linkedin.com/in/knudstevenknudsen


/All the wires are cut, my friends
Live beyond the severed ends.  Louis MacNeice/


On February 9, 2018 at 08:57:41, Mathieu Petitjean via USRP-users (usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>) wrote:

Hi everyone,

As a very newbie with SDRs, I want to use an USRP to listen to two
different, but close frequencies and distinguish them (the frequencies
are not fixed yet). I would like to implement two bandpass filters and
look at the output of both filters, but I am not sure how to proceed. Is
it feasible using the UHD C++ libraries ?

Thanks,

Mathieu



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