[USRP-users] How to visualize a band of precisely 8 MHz, with USRP2 and Simulink?

William Cox wccox at ncsu.edu
Wed Nov 3 17:15:50 EDT 2010

Couldn't you decimate the signal by 25 in the FPGA, then use a software
decimation by 2? That would get you a total decimation of 12.5.

On Wed, Nov 3, 2010 at 11:57 AM, Vlad Stoianovici <
stoianovici_vlad at yahoo.com> wrote:

> Hello everyone!
> I need to use and visualize a band of precisely 8 Mhz, with the center
> frequency 628 MHz (DVB-T), on my USRP2, working in Simulink.
> The problem is that I would need a decimation factor of 12.5 (1e8/12.5 =
> 8e6 MHz), in order to achieve this, and all specifications say that the
> decimation value needs to be an integer between 1 and 128.
> Is there a way around this problem?
> Using the 12.5 decimation value, doesn't return an error, the power values
> I get seem to be congruent with what would be expected, but when visualizing
> the band, it appears to be distorted.
> Are the power values trust worthy, or are they just like the visualization,
> distorted?
> Should I use a combination of FIR decimators and FIR interpolators? If so,
> how?
> Thank you.
> Vlad.
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