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[Discuss-gnuradio] Re: Spectrum Inversion

From: Pepito31 Pepito31
Subject: [Discuss-gnuradio] Re: Spectrum Inversion
Date: Tue, 17 Jun 2008 08:45:06 +0200

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 ?

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