How do they process high frequency signals, much high than the available uC clock speeds ?

[BradleyEnglish]

Actually, the radio system will be the limiting factor for the system data rate.
You cannot just arbitrarily keep on increasing the modulating frequency. As the modulating frequency increases, so does the bandwidth occupied by the signal. At some

Adding to Jim's thoughts,

With high data rates the bandwidth is wide, the receiver must have a wide receiving area and lots of noise gets in.
With slow data rates the bandwidth is small and more noise can be filtered out.
Also with slow data there is more time to average out noise.
There is a correlation between data rage and noise or distance you can transmit/receive.

point you will reach the stage where your signal is splattering all over signals on adjacent radio channels.

JimB

Thnks to both of you for the solid knowledge you are giving me. Its like 10 hours of lectures put into a few sentences!

 

[KeepItSimpleStupid]

Does this **broken link removed** help you at all?