Nera saturn bp Technical Manual page 19

S y s t e m D e s c r i p t i o n S y s t e m D e s c r i p t i o n
S y s t e m D e s c r i p t i o n
ADE
Forward Direction
MES
SCPC Channel (Single Carrier Per Channel)
In-band Signalling Mode
O-QPSK Encoded Signal
(O-QPSK = Offset Quadrature Phase Shift Keying)
+180° +270°
SIGNALLING UNIT – SU
BIT No.
8 7 6 5 4 3 2 1
Message type 95 1
2
MES ID
3
4
LES ID 5
6
7
spare
8
9
10
11
CCITT CRC
12
M21
SCRAMBLING VECTOR ACKNOWLEDGE
Saturn Bp Portable – Technical Manual
LES
+90° 0° +180° +270° +90° 0°
t
BIT
CONTIN.
IN-BAND SIGNALLING FRAME
WAVE TIMING
96 bits 64 bits
* Unique Word:
CW
24 bits
0111 1000 1001
for 1st subframe, and
1000 0111 0110
for 2nd, 3rd and 4th
subframe (compliment)
Octet No. 1 Octet No. 2 Octet No. 3
1 0 0 1 0 1 0 1 1 1 1 0 1 1 0 0 1 1 0 1 1 1 0 1 0 0 0 1 1 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 0 0 0 1 1 0 1 1 1 1 0 0 0 0 0 0 0 1 1 0 0 1 1 1 1 0 0 1 1 1 0 1 0 1 0 1 0 1 0 0 1 0 1 0 0 0 0 0 1 0 0 1
95 EC DD
H H H
MESSAGE MES ID
TYPE
RF Units
Duplexer
HPA
Combiner/splitter
240 ms 240 ms
IN-BAND SIGNALLING FRAME
1920 bits 1920 bits
60 ms 60 ms
SU SU
SUBFRAME - 1 SUBFRAME - 2
60 ms
* UW SUB
SU1 SU1 SU1
24 bits 32 bits
8 384 bits 8
bits bits
Before FEC
96 BIT
coding
SIGNALLING UNIT
6 bits 6 bits
Octet No. 4 Octet No. 5 Octet No. 6 Octet No. 7
18 09 F1 BC
H H H H
LES ID
(Random binary bits)
SIGNAL UNITS = 12 "OCTETS" = 96 BIT SIGNALLING UNIT.
EXAMPLE: SCRAMBLING VECTOR ACKNOWLEDGE
f = 1525 - 1559 MHz
LNA
n x 240 ms
60 ms 60 ms
SU SU
SUBFRAME - 3 SUBFRAME - 4
Octet No. 8 Octet No. 9 Octet No. 10 Octet No. 11
06 79 D5 4A
H H H H
SPARE CCITT CRC
(CYCLIC REDUNDENCY CHECK)
SCPC Signalling
24 ms
END OF
DATA
192 bits
Octet No. 12
LES_SIG
SIGNALLING
CHANNEL
09
H
17