On 02/27/2011 06:41 PM, Moeller wrote:
A real valued zero-IF "universal" (modulation independent) receiver does not
exist.
I think you have the a demodulating receiver in mind that relies on
symmetry in the baseband spectrum, like for AM. In this concept, "baseband"
is the real valued audio base
On 28.02.2011 00:22, Marcus D. Leech wrote:
> But for a zero-IF, direct-conversion, with only a single baseband output
> (single mixer), I don't see how you
>can make it work.
A real valued zero-IF "universal" (modulation independent) receiver does not
exist.
I think you have the a demodulat
On 02/27/2011 06:16 PM, Moeller wrote:
As long as you receive the complete signal bandwidth, you can create the I/Q
form later.
Of course you need the double sample rate, if there's only the real "baseband"
representation. I call it baseband, but you can also call it IF with the lowest
possible
On 27.02.2011 17:28, Marcus D. Leech wrote:
> I was on a call the other night with someone who asserted that you
> didn't need an I & Q representation
> for a direct-conversion receiver, and that I and Q could be
> synthesized later from a real-mode-only
> baseband signal.
...
> So, my feelin
Yes, it is possible:
For a bandpass signal at f_0 with bandwidth 2W, if you sample with rate:
Rs=4f_0/(2n+1) where n is an integer
you will get the in-phase components at the even samples and the
quadrature components
at the odd samples.
In particular, if you set
n= integer part of (f0/2W -1/2
I was on a call the other night with someone who asserted that you
didn't need an I & Q representation
for a direct-conversion receiver, and that I and Q could be
synthesized later from a real-mode-only
baseband signal.
I know that very-early (1940s) direct-conversion receivers didn't use I
a
