L64724 LSI Logic Corporation, L64724 Datasheet - Page 150

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

5-18
Equation 5.18
K
Equation 5.19
Equation 5.20
Fs is the sampling frequency and Fb is the baud rate
Based on the intermediate values
Equation 5.21
CAR_LAMBDA_SEL are computed as shown in
Equation
frequency (
Equation 5.21
Equation 5.22
Equation 5.23
Equation 5.24
K
of SNR as well as the mode (DDML or NDAML).
gains of the two phase detectors as a function of SNR.
Demodulator Module Functional Description
digital
dcar
T b
K
L
CAR_MU_SEL
CAR_LAMBDA_SEL
a
b
car
dcar
=
=
(or K
=
is a function of SNR (see
=
------ -
Fb
-------------------------- -
K
-------------------------- -
K
1
2
=
5.24. The damping factor (
dcar
dcar
Fs
------ -
Fb
n
2
digital
K
-------------------------------
T b
n
n
digital
L
L
) of the loop is in radians/sec.
T b
car
car
and
2
) is the Carrier Loop Phase Detector Gain. It is a function
Carrier Loop Phase Detector Gain
Symbol Time
Oversampling Ratio
32
=
0.78
Equation
l og
2
=
l og
a
2
25
2
5.22, CAR_MU_SEL and
b
2
16
Table 5.4
a
and
is normally 1.0. The natural
b
on
, which are calculated in
page
Equation 5.23
Table 5.4
5-19).
presents the
and