OFDM , . : , , . OFDM . 2 4 . ( ). , -64, (), -4. .
, OFDM . / - , . , OFDM , , OFDM , OFDM , . OFDM . , , ; , OFDM .
OFDM . . , , OFDM .
:
- 15 ;
- 200 ;
- 20 /.
. OFDM . / 1 . , .
OFDM ; , / OFDM / OFDM . .
|
|
, -16, 4 ; ½, 2 . 48 , OFDM 96 .
OFDM . , -4 ¾. . , OFDM 96 , . , 15 .
, . , 48 -16 .
, () () 16 , . , OFDM , .
, , , ( ) OFDM . , 64 , .. 64 , . .. , OFDM . , OFDM , .. , . , , ; , , ; .. , . : . .
|
|
, - , , .
, .. , .
2
MATLAB
MATLAB - , , . , - . MATLAB .
c "MATLAB Command Window". , ";". "Enter" .
, , . , File - New Figure, : figure(n), - . (MATLAB Command ). , , .
3
imitatorOFDM
, . MATLAB : imitatorOFDM . , . OFDM MATLAB , ; . , OFDM; , .
, . , OFDM . OFDM ; [1].
OFDM , , . , . : 8 , 50 %; , , ; , , . () , ; ; , .
|
|
; [ / ]; [ ] , - OFDM . .
4 imitatorOFDM.
4
imitatorOFDM
imitatorOFDM
Nsub = 48;
( Ts: 1<Ts<200 )
OFDM [] Ts = 20e-6;
( Tg: 0<Tg<0,2Ts)
. [] Tg = 2e-6;
( M: 2,4,8,16,32,64,128,256)
M = 16;
( Ns: 2)
Ns = 512;
( betta: betta < 0,2Ts)
betta = 0.08;
.
.
imitatorOFDM
:
OFDM Ff = 50000 ;
dt = 3.5149e-008 c;
Fs = 28450000 ;
T = 1.7996e-005 c;
- . .DF = 55566.4062 ;
. Ng = 57;
Tp = 1.6169e-006 c;
Tp Np = 46.
.
1.
.1. . 1.
.
2.
[0, T]
( : Nsubn=[1 3 5 ];)
Nsubn= [1 2 5];
[0, T]
.2. . 2.
.
3.
. . Tg = 2e-006 .
Tp = 1.6169e-006 .
[-Tg, 0] [T, T+Tp]
. 3. . 3.
.
.
|
|
. 4
. . 4
.
4.
. 5.
. . 5
.
5. Ns
OFDM OFDM
. 6 OFDM .
6. OFDM ,
. 7
3- OFDM .
7. n
OFDM
( n: 50 < n < 200)
OFDM n = 200;
imitatorOFDM
, n = 200 OFDM .
ns = 113846.
Fs = 28450000.
-, , - yOFDM.
8.
OFDM
yOFDM
OFDM . 8
0 Fs = 28450000.
9.
OFDM
OFDM . 9
f .
.
29