Something obvious (although you might not actually want it :) is a 2D
equalizer and higher modulation schemes.
MB
sorry,but i didn't understand..why an equalizer?ofdm don't requeire
it,is it?
The equalization step is easy - the hard part is channel estimation
given a
certain set of pilot symbols on a time-frequency grid.
A 2D-Wiener filter is the best solution in the MMSE sense, but
time-variant
and depends on the current SNR. A good suboptimal solution might be 2D
interpolation
based on a precalculated (Wiener-) filter given the pilot positions and
some reasonable
assumptions on the time/frequency correlation. A simple solution might
be based on linear
interpolation or a sinc-interpolation if the pilot grid is regular.
There are all sorts of things one could try and compare!
Jens
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