L64724 LSI Logic Corporation, L64724 Datasheet - Page 229

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

Equation B.9
For a baud rate of 21.3 Mbaud we can choose B
therefore
The loop equations are calculated as shown in
Equation
Equation B.10
Equation B.11
The values of
CAR_LAMBDA_SEL[3:0] registers in Group 4.
We can now calculate
B.13.
Equation B.12
Equation B.13
CAR_MU_SEL[3:0] and CAR_LAMBDA_SEL[3:0] are defined in
Equation B.14
Equation B.14
QPSK Demodulator and FEC Configuration Example: High Data Rates
b
CAR_MU_SEL
B
B
a
b
a
L
L
=
=
=
=
=
=
-------------------------- -
K
-------------------------- -
K
2
dcar
2 106 10
-------------------------------------------------------------------- -
--------------------------------------------------------------------- -
0.003125 BaudRate
--------- - 1
dcar
106 10
2
B.11.
2
n
n
n
T
n
L
L
T
= 106 Krad/s.
2
car
car
+
0.24 2.34
0.24 2.34
and
a
-------- -
4
3 2
=
1
and
2
2
2
3
l og
Equation
-------------------------- -
21.3 10
-------------------------- -
21.3 10
2
b
a
t
are used to calculate CAR_MU_SEL[3:0] and
1
and
a
1
2
6
B.15.
25
b
6
2
as shown in
=
=
=
17.7 10
l og
44 10
2
44 e -6 2
–
6
–
3
Equation B.12
Equation B.10
25
L
= 66 Krad/s and
=
10
=
0xA
and
and
Equation
B-15