Architecture of *_rx_cfile.py output vector

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1

Hello List,

just wanted to know exactly how the output vector of
…_rx_cfile.py is structured.
Is the first element of the complex vector v[0] the one at
the desired frequency sprecified by “-f FREQ”?

Thanks

Sebastian

2

On 28-11-2011 10:21 AM, Sebastian D. wrote:

’
It’s just raw complex-float samples in native-binary format.

The first item is I the second is Q then I then Q, etc.

They’re time-series samples, not FFT outputs.

3

On Mon, 28 Nov 2011 10:32:28 -0500
“Marcus D. Leech” [email protected] wrote:

Sebastian

Uh ok - explains a lot…
Since the data is getting recorded as 32-bit complex
float, is “read_complex_binary()” the right octave method
to put it into a vector I can use for further processing?
I found a gnuradio page that says “read_short_binary()” is
supposed to be the right method, but the output vector
does not make any sense to me…

Regards
Sebastian

4

On 29-11-2011 11:12 AM, Sebastian D. wrote:

Thanks

Regards
Sebastian

Yup, read_complex_binary() is the one, as far as I can tell. I’m not a
MatLab/Octave user, but it seems like that reads complex-floats.

5

On Tue, Nov 29, 2011 at 11:32 AM, Marcus D. Leech [email protected]
wrote:

structured.

can use for further processing?
I found a gnuradio page that says “read_short_binary()” is supposed to be
the right method, but the output vector does not make any sense to me…

Regards
Sebastian

Yup, read_complex_binary() is the one, as far as I can tell. I’m not a
MatLab/Octave user, but it seems like that reads complex-floats.

Yes, that should work for you. The “read_short_binary()” should be
usable
if you use the ‘-s’ flag in the uhd_rx_cfile.py to output shorts. I
think
you’ll have to deinterleave the I&Q after you read it in, IIRC.

Tom