Maybe, some day, in a more informed world, this old text will be corrected
<GSM uses a time-coded radio air interface that provides a good quality signal but suffers capacity limitations. >
to
"GSM uses a time-coded radio air interface that provides a good quality signal, saves battery capacity, enables
smaller filters, with no suffering of capacity within these goals, especially in a cellular network"
Ilmarinen
As always
- GSM uses constant amplitude FSK for more efficient RF amplifiers, not to drain the battery
(additionally Gaussian MSK, partial pulse repsonse (fancy stuff) to filter the signal without having to
go back to linear, battery wasting RF, PA stages)
- GSM does not talk while listning, avoiding those crazy duplex filters with 120dB dynamite dynamics
But this has been extremely difficult to understand among USA non-professionals, as US-TDMA did
not achive either one, poor thing. |
