() - . -
1983 .
Motorola DynaTAC 8000X - 15 , $100,0. 794 33,0 x 4,4 x 8,9 . 8 . . - $3.995.
, , DynaTAC 8000X .
, , "100 ". 67 , E-News.
, 80 , ArrayComm - (). , , : - " 3G is dead ".
()
- , .
25 80,0.
- AMPS - Advanced Mobile Phone System - ( ) () 1983.
AMPS , , , , .
:
- - SDM - Space Division Multiplexing - ().
- () - , - , - .
- (100,0 );
- ();
- () BTS
Base Transceiver Station - .
- BTS () , MS ( , , ).
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- BTS - BSC - Binare Synchronous Comunication - - - ( - , ISO - ).
BSC BTS. BTS BSC BSS - Base Station (Sub)system - () .
BTS- BSC- - GSM - Global System for Mobile Comunikation:
- () , BTS, , , .
- (), , .
- -
- - (), BTS (d = √3R). , .
- 10-50 ( 60) , ().
- (), , .
- - () , , .
BTS , ( ), ? - , , é BTS, , , , .. BTS .
.
.
- NMT 450 NMT 900 - Nordic Mobile Telephone , 450,0 900,0 - , " ". NMT 450 , (: - GSM 900);
( - signaling).
- - FDMA - Frequency Division Multiple Access, ( ) 12,5 30,0.
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- , , , .