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AMT-70/AMT-73/AMT-75 Installation and Operation
The calculated uncoded size is thus reduced to the nearest multiple of 8.
8
8
)
32
)
((
int
×
⎟
⎠
⎞
⎜
⎝
⎛
−
×
×
=
z
Y
X
bits
U
U
U
U
In 2D cases,
U
z
is 1. The code rate is then determined as the ratio of the two values:
E
U
CodeRate
=
For each of the supported code, the rates are:
Eb/No
(10 Mbps data rate & 10
-7
BER
)
Code
Rate
TPC Code
QPSK
8PSK
16QAM
eH(32, 26) eH(32,26) eH(16,11)
2.4 dB
0.44815891
TPC16K-2/5
eH(64, 57) eH(64, 57) P(4,3)
0.58817829
TPC16K-3/5
2.9 dB
5.8
eH(64, 57) eH(64, 56)
0.76550388
TPC4K-3/4
3.9 dB
7.0
7.9
eH(128, 120) eH(128, 119)
0.86288760
TPC16K-8/9
4.2 dB
7.3
8.3
eH(128, 120) P(128, 126)
0.91375969
TPC16K-19/20
5.1 dB
8.6
9.6
0.75
TPC-4k
3.9
dB
7.0
7.9
7.3
0.875
TPC-16k
4.2
dB
8.3
Figure 58: eTPC Code Rates and Eb/No Values
The code rate can then be used to calculate the transmitted symbol rate from the input bit rate (and
visa versa
):
s
symbols
s
bits
symbol
bits
BaudRate
BitRate
Modulation
CodeRate
/
/
/
=
×
The ratio of the raw data (base-band) bit rate and the transmitted symbol rate is the product of the
code rate and the modulation order in bits/symbol: BPSK has order 1; QPSK and Offset QPSK have
order 2; 8PSK has order 3 and 16QAM order 4.
119
Summary of Contents for AMT-70
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