26
4430-V & VN BPSK/QPSK VME Demodulator & Optional Modulator User’s Manual
Doc: 4430_V,VN.fm, © 11 Jul 2005, 14:55
Table 3.3.1: E
b
/N
o
versus LPSR Selection Table
Calculate the percentage loop bandwidth by dividing the loop bandwidth value
by the demodulator carrier frequency as shown below.
1.
% Loop Bandwidth (%LBW) = LBW/Demod fc
If the value is outside the ranges specified, the VCO or VCXO on the board will
not be capable of supporting the loop bandwidth selected. Therefore, an evalu-
ation should be made based on the following criteria:
1.
If the %LBW is greater than the range supported by the board, the %LBW value
should be defaulted at the highest value for the particular board and the LBW
should be reassessed via the following formula:
LBW = %LBW x Demod fc
2.
If the %LBW is less than the range supported by the board, the %LBW value
should be defaulted at the lowest value for the particular board and the LBW
should be reassessed via the following formula:
LBW = %LBW x Demod fc
E
b
/N
0
LPSR
E
b
/N
0
LPSR
-4
0.00003
6
0.007
-3
0.00005
7
0.015
-2
0.0008
8
0.02
-1
0.00014
9
0.035
0
0.00024
10
0.06
1
0.0003
11
0.1
2
0.0006
12
0.15
3
0.001
13
0.2
4
0.002
14
0.3
5
0.004
-
-
(Range 4430-V: 0.0005 to 0.03)
(Range 4430-VN: 0.00003 to 0.0005)
%LBW =
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