, , , - () ( ).
:
- , BCA - Borrowing Channel Allocation - ;
-
FCA - FixedChannel Allocation GSM (Global System for Mobile mmunication - );
- CDMA , .
- ( , , R = 6,5 - 13,0), BTS , . n , n2 , n2 .
BTS ("" ) (, ) , .., .. "" .
1 - :
,, AMPS n (, 32):
n = 32
, - K.
, AMPS - Advancet Mobile Phone System - - 1G (850):
K = 336
( , , - ) - N (, 7):
N = 7
N : 1, 3. 4, 7, 9, 12, 13, 16, 19, 21 ..
:
K: N = 336: 7 = 48
:
48 32 = 1536
- R, : = 1,6.
, , 1,5
( - ) - S - :
S = R² 1,5 √3 = (1,6)² 1,5 1,73 = 2,56² 1,5 1,73 = 6,64²
, - S:
S = S n = 6,642 32 = 212,482
D - , , ;
|
|
D = R √3N = 1,6 1,73 2,645 = ~7,32
d - :
d = √3 R = 1,73 1, 6 = 2,77
2 - :
, n' = 32 4 = 128 - 4 , , - S' - - 4 :
S' =6,64²: 4 = 1,66²
S :
S' = 1,66² 128 = 212,48²
( ) 4 :
K´ n' = 48 128 = 6144
- :
, . | 1,0 - 2,0 | 0,1 - 0,2 |
, . | 1,0 - 10,0 | 0,1 - 1,0 |
, . | 0,1 - 10,0 | 10,0 - 100,0 |
, / | 0,3 | 1,0 |