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Re: calculate SNR and watch a binary file

From: Markus Feldmann
Subject: Re: calculate SNR and watch a binary file
Date: Thu, 26 Mar 2009 22:59:57 +0100
User-agent: Mozilla-Thunderbird (X11/20090103)

Rob Mahurin schrieb:
On Mar 26, 2009, at 3:24 PM, Markus Feldmann wrote:
I upload binary files. The first is with a sin signal: usrp_output_64bit_complex_only_sin_signal.dat.html

and another one without any test signal, but only noise: usrp_output_64bit_complex_only_noise.dat.html

These files came from some analog-to-digital converter? If you look at them with hexdump, there is stuff that looks like data only in the first 200 bytes or so. The rest of the file looks likes zeros and the occasional 0x80bf. I wouldn't expect the data read from these files to have a meaningful Fourier transform.


I also noticed that the beginning looks different to
the rest.

Maybe i have to collect 32bit to one float count ?
As i wrote, 1 sample consists of 32 bit, and because
this comes from an IQ signal, this should be 2 samples ???!

If i only plot the vector containnig the float samples:
plot([real(c(t)), imag(c(t))])
i got for the beginning,

And if i do,
plot([real(c(t)), imag(c(t))])

Regards Markus

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