> 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 demodulating receiver in mind that relies on
symmetry in the baseband spectrum, like for AM. In this concept, "baseband"
is the real valued audio baseband. For digital modulations it doesn't make sense.
The real valued representation with IF at half of the one-sided signal bandwidth
can be called "real baseband", in contrast to the "complex baseband".
Same data size, same content, same bandwidth, just shifted in spectrum.
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