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3.3.1.2.4. SOQPSK Demodulation
Shaped Offset QPSK (SOQPSK) is a constant envelope Continuous Phase Modulation (CPM). It is derived from
OQPSK with the addition of a baseband filter that further reduces side lobe levels and spectral bandwidth. Filter
shapes are defined for SOQPSK-TG, -MIL, -A and –B.
SOQPSK can be combined with a differential decoder to remove the phase ambiguity of the modulation. BER will
be increased by a factor of two.
0
-10
-20
-30
-40
-50
-60
-70
-80
-2.5
-2
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
-1.5
-1
-0.5
Frequency (Bit Rates)
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It cannot be duplicated or distributed without expressed written consent.
SOQPSK-MIL
SOQPSK-B
SOQPSK-A
0
0.5
1
Safran Data Systems
.
Ref.
DTU 100042
Is.Rev.
5.17
Date:
Dec.
03, 2021Sept. 30, 2021
SOQPSK-TG
1.5
2
2.5
Page 28
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