ײ
. 504. 539. 13. 1005141
539-A
..
. . ,
. .
2013
. 3
. 5
1 . 6
1.1 . 6
1.2 . 8
1.3 . 9
1.4 . 10
2 .. 11
3 . 15
4 . 17
5 . 21
6 . 24
7 . 27
8 - . 29
. 32
.. 33
(), ,
( 1).
1
(t);
- , (ti), j(ti) j(ti) ;
K , b(t);
, s(t);
, z(t) ;
, bk;
, j(ti);
- , bj(ti) b(t);
.
1 . 5
/ | |
() | |
min | -6,4 |
max | +6,4 |
N0 | 2/ |
S5 | |
j=103 | |
(PSK) | |
115200 / | |
N0 | 2/ |
1950- , . , CD- DVD-, , . , (). , .
|
|
- , , . (digital communication system DCS) , , ( , ). DCS , , . DCS .
:
1. , , . .
2. , . , .
3. .
4. - - , , , , .
, , . , , , .
(t) , . min max, .. . N0 = 2/, N0 = 2/.
|
|
, .
:
(1)
2
, .
:
(2)
3
.
(3)
(4)
() . , . . X̅=0 , Px=13,65 B2 .
>>m_SIG=mean(SYG)
=-0,0694,
>>std_SIG=std(SYG)
=2.1250.
>>Kx=XCOV(SYG,'biased');
>>tau=((0:N/8))*Ts;
>>plot(tau,Kx(N:N+N/8))
( orrelatio , ) ( , ). .
4
, . 5.
5
6
7
7
fmax = 8 .
. , , , , , . . , . n
, . 1948 . . .. .. . . .
0 , 1, , .. [].
:
(5)
: . , . .
|
|
∆t :
(6)
.
N* fmax=0,55*107 2/*10000 =5,5*10-4 B2, (7)
=2,34*10-2 B. L
Δx=3*CKO=0,07 (8)
(max-min) Δ.
(9)
2 128, .. 7.
p(ξ.) , p(ξ.) xj-Δx/2≤ξ≤xj+Δx/2 ( xj-j ) .
, :
(10)
:
(11)
(12)
(13)
(14)
:
(15)
(16)
(17)
(18)
k, L
j = 103 1100111
(19)
8 () j = 103.
.
, x(t) . j- , x(t) xj≤x≤xj+1.
(20)
, P(xj) j.
, . , :
(21)
.
8
9
9 , , .
, , : , , . ( ), , . 10 , . . , k . , , . , . , , , : .
|
|
10
. , , . , . , , .
, (n,k). bk n- b(t) t . b(t) .[1, c 18-20]
, n = k+1 = 8. k=7 , 2. , 0, 1 - .
M=2, n=8, :
ρ = 1 - H (λ)/log K, (22)
log K -
(23)
bn = (b1,b2,b3,b4,b5,b6,b7) = (1,1,0,0,1,1,1) = 1. j=103 : 11001111.
11
: 1 Δt/n Δt/k , 1 , 0 - .
, :
(24)
:
(25)
, , , , . , . , . ( ), , , . , . [2, c 182 183].
b(t) - U(t)=Ucos2πft, U = 1.
f = 100VK = 16 . (26)
0 - s0(t) =Ucos2πft, 1 - s1(t)= -Ucos2πft.
b(t),
(27)
.
12 b(t)
: b(t) , +1 -1, , . . .
:
. (28)
b(τ) - ,
(29)
(30)
(31)
(32)
|
|
(33)
b(t) Fb
Fb = 3/ = 3V = 480 . (34)
14
:
(35)
, , Pb.
s(t)
(36)
.
15 () ()
c
f = 16 , Fb =480 .
:
(37)
(38)
Ss(f).
16
- s(t) b(t)
ΔFs = 2Fb = 960 . (39)
, . , .
. , , , , , , ... , , - ( , ..).
. , , , . . , , . 150 , .
, (, ) . 3*103 3*1011 .
. , , , , . .
. :
) ( ), ;
) ( ), . , ;
) . - .
, , . , . .[2, 84-86]
s(t)
(40)
=1
N.
, , ,
(41)
(42)
s0(t) s1(t) , s(t), :
, (43)
0 1 s0(t) s1(t) .
(44)
/
(45)
, , , , , Pn :
(46)
:
K = H/C = 133,8/546,3=0,245 (47)