T/2 -spaced FSE MMSE equalizer, with carrier offset

Hi, Steve

> If the constellation spins rather slowly, and the equalizer adapts
> fairly quickly, you can actually track the constellation's spinning in
> the equalizer, and be able to decode the data. This is a *really* nasty
> botch, though, and you can't expect to demodulate high order QAM this
> way. You can kinda decode 16-QAM at high SNR - interesting for
> experimenting, but not much use in a system.

You are right.

With 16-QAM at high SNR, when the constellation spins rather slowly,
and the training curve of the equqlizer converge. Though, as you said
before, it is meaningless.

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Has anybody observed the frequency response of a adaptive equalizer?

It is well known that the magnitude response of "zero-forcing
equalizer" is just the inverse of channel magnitude response? Then, how
about adaptive equalizer?

I think the response of the adaptive equalizer may look like the one of
"zero-forcing equalizer". The difference is amplitude response of the
adaptive equalizer is not as high as "zeroforcing equalizer", when the
amplitude response of channel is really small.

Am I right?