You cannot represent a "pure" sinusoid with a real signal. Think e^(jw)
vs Re{e^(jw)} Maybe someone could think of a better way to say this.
All USRP devices input and output complex baseband. You need to
represent your signal in complex baseband. I suggest experimenting by
feeding your signal into the _complex_ fft plotter in grc and see how it
looks spectrally, because thats how your actual spectrum will look when
you transmit, but shifted up by fc Hz.
-Josh
_
One could take that real sinusoid, and translate it into the complex
plane with a
Hilbert transform, and there's a block for doing that.
Although, if this is a pre-recorded signal, one could simply do the
Hilbert transform
"offline", and have the pre-recorded signal be already transformed
into the complex
plane.
But if Arya is already using a signal-generator block within GRC or C++,
they could simply
use the already-existing complex output type.
The hardware expects signals to be represented in the complex plane,
even when there is no negative
frequency content of said signals.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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