I was reading this-http://en.m.wikipedia.org/wiki/WiMAX
And according to that Wimax supports speeds up to 1Gbps! So why doesn't Compass offer speeds higher than 10/3
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The article talks about spectral efficency and that is defined in terms of bits/hertz. So the more frequency you rent, the faster the service you can offer (ignoring oversubscription considerations).
However, Compass will also need to divide up the leased frequency so that there are no overlaps otherwise the receiving antenna won't know which base station is talking to it. So a tower may have 60 degree antennas allows the same frequency to be used twice (e.g. on the antenna facing north and the one facing south) - but that means you have to divide the leased frequency up into 3 sub-bands to avoid the overlap. Once that is done you need to co-ordinate those three frequencies with the towers next to it and avoid frequency clashes. So you get smaller and smaller bands to operate in.
The 3.5 GHz frequency was divided up into 3.5 Mhz or 7 Mhz chunks so you can work out what is the maximum possible speed however I don't know what frequency the Compass WiMAX is using so can't offer anything more definative.
So yes the WiMAX technology could provide that speed if there was only one antenna using all the available frequency etc.
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