. 6.11. Spot |
Spot . Spot Harris, .
, Spot . , , .
Spot 4U , .
6.2.2 DVB- ELTI. ELTI () (gap filler) DVB-T. 0,5250 . ETSI EN 300744 (. 6.12-6.14).
RF Filter |
RF Filter |
IF Filter |
IF Filter |
A D C |
A D C |
Subsampling and Filtering |
Subsampling and Filtering |
60 MHz |
60 MHz |
Reference Input |
Main Input |
UHF LO |
LMS Estimator |
Adaptive Filter Estimator |
+ |
- |
Signal Monitoring |
Embedded processor |
AGC |
USB2 Interface |
Upsampling |
60 MHz |
Digital Processing |
D A C |
UHF LO |
RF Filter |
. 6.12 DVB- ELTI
On-Channel Repeater |
Monitoring |
DVB-T Power Amplifier |
Channel Filter |
Adjacent Channel Transmitter |
Reference coupler |
Combiner |
Reference Input |
Main Input |
. 6.13.
. 6.14. ELTI |
:
DTL 0,5W-5W (. 6.15);
DTL 10W-25W;
DTL 50W;
DTL 100W;
DTL 250W (. 6.16).
/ |
/ |
/ |
MFN |
.6.15. DTL 0,5W-5W
ELTI:
19" ;
;
;
, LD-MOS;
(SFN) (MFN) ;
ETRC-ELTI.
ELTI 100W DVB-T GaAs LD-MOS, .
|
|
0,55
/
/
/
MFN
.6.16. DTL 250W
/ Wilkinson.
. DVB-T RS-485 . .
230 . 12 ( ) 32 , .
100W DVB-T "" , ALC ( ) , .
7. | DVB-T |
9.1.
9.2.
9.3.
7.1.
, . , , , . , - 1- 2- - .
- . - , , , , . ( ), , . , . , , . , ( ), , , , - . , , .
|
|
, ; , . , (I-II, III ), . , ( ), - , .
, , "" (. 7.1).
. 7.1 ""
, , .7.1.
, , , , , . , MB (- , - MB, - ). , , , .
7.1
, | ||||
, | ||||
, | -1 | 10-12 | ||
, |
( , ). .
, , :
(//).
, , 64-QAM 5/6 (K ) :
- 49 ;
- 60 .
, , , , , ( , ).
7.2
, , , , , ( ). , , , , . , , , , (N TB N A , ). , N A > 3 , ³ - 5 8 () 20 .
|
|
. 9.2 ( 600 ), , 64-QAM-5/6.
7.2
N A, | K A, | G A, | η, | E, // | ||
- | - | 48.3 | ||||
41.5 | ||||||
39.6 | ||||||
41.3 | ||||||
39.3 |
, ( 1) 7 ; 20 0,2-0,3 . , . " " (. 7.2).
- :
;
;
. 7.2.
;
-;
, ;
, . () .
7.3
- IRD (. 7.3).
, , .
. . QPSK- ( ) N-QAM- ( ) I Q, OFDM- ( ) .
- , . , . 188- -. .
|
|
, .. , .
-
I
Q
CI
PCMCIA
PAT, CAT, PMT
PID -
-
-
R
G
B
R
L
. 7.3.