Re: [Discuss-gnuradio] Re: Spectrum Inversion

[Matt Ettus]

Pepito31 Pepito31 wrote:
> Matt Ettus wrote:
>   
> > Pepito31 Pepito31 wrote:
> >     
> > > Hi,
> > > I have recorded a signal that is spectrum inverted. I've heard that it's
> > > possible to restore the signal by "swapping" I and Q, but I remember
> > > that there was a "minus" to intruduce in-between.
> > > Could you please help me, giving me the exact transformation to apply,
> > > and eventually the associated limitations.
> > >
> > >   
> > >       
> > You can invert the spectrum of a complex signal by doing ONE and ONLY
> > ONE of the following:
> >     swapping I and Q
> >     negating I
> >     negating Q
> >
> >
> > Matt
> >     
>
> Thanks Matt,
> For information, is this transformation only valid for a transformation 
> for a carrier centered on 0, or is it applicable to a carrier located 
> everywhere on the spectrum ?
>
> Pepito
>   

It will reverse the entire signal.

Matt