How much throughput that could equal is going to depend on the way that the system is set up, how much noise there is on a given frequency, dopler shift and what kind of spectrum management is used, but no matter how you cut it it won't be much. Assuming only one to one overlapping of cells (which is very generous) and very low noise you might get a total of 4 megabits combined up and downstream to be shared by all users in a given area.
You mention doppler shift, despite the fact these are electromagnetic waves, and you have to be in something moving very very fast to observe this effect. Anything land based won't get near those speeds
Ya'll hear about the geometer who went to the beach to catch some rays and became a tangent ?