Users of mobile IT systems are calling for ever higher data rates, but such
mobile radios are subject to multipath fading and intersymbol interference
, often calling for complex equalizers at both ends of each link. Where the
links are of short range, they often use time-division duplex. This articl
e demonstrates how this option permits much of the complexity of channel ma
tching and equalization to be transferred from post-processing at the many
sparsely used mobile terminals to a few intensively used preprocessors at t
he base station or central hub.