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SLM-5650 Satellite Modem
Introduction
1.8.5 BER Performance with Asymmetrical Adjacent Carriers
Operating in the presence of two adjacent asymmetrical carriers, one lower in frequency and one
higher in frequency, and each adjacent carrier symbol rate (R"
performance is not degraded more than indicated in Table 1-10, Column four, and a and b.
Performance is measured with the adjacent carriers center frequencies offset (X/2) times
(R'
+ R"
) Hz from the test carrier center frequency, where X is the spacing factor and R'
s
s
modulation symbol rate in Hz of the test carrier, and R"
each adjacent carrier. For modulation symbol rates below 38.4 ksps, this paragraph does not
apply.
a. For X (spacing factor) = 1.2, and R"
b. For the case of (1.4/2)(R'
be IAW one of the values in Table 1-10, Column four, and the corresponding test
carrier E
/N
in Column one. Select a test carrier E
s
0
results based on modulation and coding used in the test configuration. The
adjacent carriers E
/N
s
0
< 0.2 dB.
is the modulation symbol rate in Hz of
s
= 2.0 R'
, the asymmetric degradation shall
s
s
are set to the corresponding value in Column two.
+ R"
) Hz carrier spacing, the degradation is
s
s
1–17
MN/SLM5650.IOM
) = 2.0 R'
, the modem
s
s
/N
that will yield timely
s
0
Revision 2
is the
s
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