Sequential Decoding With / Without Reed-Solomon; Ber Performance With Symmetrical Adjacent Carriers; Table 1-17. Sequential Decoding With / Without Reed-Solomon Ber Performance - Comtech EF Data SLM-5650B Installation And Operation Manual

1.4.1.3.7

Sequential Decoding with / without Reed-Solomon

DESCRIPTION
Sequential – 64 kbps
Sequential – 1544 kbps
Sequential+RS (225,205)
1.4.1.3.8

BER Performance with Symmetrical Adjacent Carriers

Operating in the presence of two adjacent symmetrical carriers (one lower in frequency and one
higher in frequency with same modulation, data rate, and coding), the modem performance is not
degraded more than as indicated in Table 1-18 Column 3, and a) and b) in this section. This
performance is measured with the adjacent carrier's center frequencies offset XR
frequency of the carrier under test, where X is the spacing factor and R
in Hz of the symmetrical carriers.
The BER of the test carrier is measured at the specified carrier Ratio of Energy per Symbol to Noise
Power Density in a 1 Hz Bandwidth (E
The adjacent carriers are applied at the specified center frequencies and E
test carrier is measured. The change in BER is equal to the change in E
characterization curve of the test carrier and the amount of Adjacent Channel Interference (ACI)
degradation. For modulation symbol rates below 38.4 ksps, this paragraph does not apply.
a) For X (spacing factor) = 1.2, the symmetric degradation shall be IAW one of the values in
Table 1-18 Column 3, and corresponding test carrier E
carrier E
configuration. The adjacent carriers E
b) For the case of X (spacing factor) = 1.4, the degradation is less than 0.2 dB.
Introduction
Table 1-17. Sequential Decoding
with / without Reed-Solomon BER Performance
E
b
Sequential Decoder with / without Reed-Solomon
BER
10
-5
10
-6
10
-7
10
-5
10
-6
10
-7
10
-6
10
-7
10
-8
/N
s 0
/N that will yield timely results based on modulation and coding used in the test
s 0
/N (dB) Specifications
o
BPSK
1/2 1/2
4.8 4.8
5.2 5.2
5.6 5.6
5.2 5.2
5.7 5.7
6.1 6.1
4.4 4.4
4.6 4.6
4.8 4.8
) Carrier to Noise Ratio (C/N) without the adjacent carriers.
/N
s
/N shall be set to corresponding value in Column 2.
s 0
1–24
SLM-5650B Satellite Modem
Revision 2
QPSK/OQPSK
3/4
5.8
6.4
6.9
5.9
6.5
7.0
5.0
5.3
5.6
Hz from the center
s
is the modulation symbol rate
s
/N and the BER of the
s 0
/N based on the
b 0
in Column 1. Select a test
0
MN-SLM-5650B
7/8
7.0
7.5
8.0
7.2
7.7
8.3
5.6
6.0
6.4