WiMAX IEEE802.16e SOFDMA - Scalable OFDM Access), , . , ( ) , . 802.16 WiMAX.
802.16 802.16-2004 , . Tb. 802.16 1,25; 5; 10 20 (. 11.5).
11.5
OFDM | ||||
, | 1,25 | |||
Tg/Tb | 1/32, 1/16, 1/8, 1/4 | |||
[9] | 28/25 | |||
, | 10,94 | 10,94 | 10,94 | 10,94 |
, | 91,4 | 91,4 | 91,4 | 91,4 |
, , Tg/Tb = 1/8 | 11,4 | 11,4 | 11,4 | 11,4 |
OFDM Ts= Tb+ Tg, | 102,9 | 102,9 | 102,9 | 102,9 |
802.16 . . PUSC (Partial Usage of Subcarriers). . PUSC . 11.6. . , .
11.6
, | 1,25 | |||
, | ||||
(/) | 22/21 | 46/45 | 92/91 | 184/183 |
14 . 2 OFDM , .. 28 , 24- , 4- (. 11.5). . . 1.6 . .
. 11.5. PUSC
|
|
PUSC , . 802.16 . . 11.7 , PUSC .
11.7
- | |
6 . (. 11.8). . 11.8, Ns=2048 1024 . Ns=2048 24 , 16; Ns=1024 12 8 .
11.8
Ns/ | |||
2048 / 20 | 0 - 23 | 0 - 11 | |
24 - 39 | 12 - 19 | ||
40 - 63 | 20 - 31 | ||
64 - 79 | 32 - 39 | ||
80 - 103 | 40 - 51 | ||
104 - 119 | 52 - 59 | ||
1024 / 10 | 0 - 11 | 0 - 5 | |
12 - 19 | 6 - 9 | ||
20 - 31 | 10 - 15 | ||
32 - 39 | 16 - 19 | ||
40 - 51 | 20 - 25 | ||
52 - 59 | 26 - 29 | ||
512 / 5 | 0 - 9 | 0 - 4 | |
10 - 19 | 5 - 9 | ||
20 - 29 | 10 - 14 | ||
128 / 1,25 | 0 - 1 | ||
2 - 3 | |||
4 - 5 | |||
, 2 . 2 ‒ 28 ; 56 (. 11.6). PUSC ( ). WiMAX, .
. 11.6. PUSC
802.16 (. 11.7). PUSC , , . WiMAX 0,2 4 .
. 11.7.
PUSC - (tile). 4 3 OFDM- (. 11.8). 8 , 4 .
OFDM- 0 | ||||
OFDM- 1 | ||||
OFDM- 2 |
. 11.8.
|
|
. 6 . . . 11.9 PUSC .
11.9
, | 1,25 | |||
(/) | 16/15 | 52/51 | 92/91 | 184/183 |
. 2 20 . , . . : , , .
2 : (DL, ) (UL, ) (. 11.12). TTG (transmit/receive transition gap). RTG (receive/ transmit transition gap). TTG RTG 5 .
. 11.12. .
; . . 11.12 : , PUSC. DL PUSC ; . DL MAP.
OFDM- . , /, . , 2-. PUSC 3 .
FCH (Frame Control Header). DL-MAP.
DL-MAP. (burst), UL-MAP ( ).
C . 11.13 ( 3:1).
11.13
1,25 | 5 | 10 | ||||
/ | ||||||
4-, 1/2 | 0,504 | 0,154 | 2,520 | 0,653 | 5,040 | 1,344 |
4-, 3/4 | 0,756 | 0,230 | 3,780 | 0,979 | 7,560 | 2,016 |
16-, 1/2 | 1,008 | 0,307 | 5,040 | 1,306 | 10,080 | 2,688 |
16-, 3/4 | 1,512 | 0,461 | 7,560 | 1,985 | 15,120 | 4,032 |
64-, 1/2 | 1,512 | 0,461 | 7,560 | 1,985 | 15.120 | 4,032 |
64-, 2/3 | 2,016 | 0,614 | 10,080 | 2,611 | 20,160 | 5,376 |
64-, 3/4 | 2,268 | 0,691 | 11,340 | 2,938 | 22,680 | 6,048 |
64-, 5/6 | 2,520 | 0,768 | 12,600 | 3,264 | 25,200 | 6,720 |