參數(shù)資料
型號(hào)： GALAXY
英文描述： Galaxy Simulation Toolkit User＇s Guide
中文描述： 銀河仿真工具包用戶指南
文件頁數(shù)： 7/23頁
文件大?。?/td> 435K
代理商： GALAXY
comtech
aha
corporation
Page 4 of 20
A subsidiary of Comtech Telecommunications Corporation
PSGalaxy_STK_0100
4.4
SOFT DECISION INPUTS
The inclusion of confidence information input
to the decoder can significantly improve the
performance of the decoder. The confidence
information is in the form of soft decision bits from
the demodulator. The more bits of soft information
that are available, the more powerful the error
correction.
Two parameters that determine how Galaxy
interprets soft decision input data are
quant_size
(Quantization Size) and
quant_mult
(Quantization
Multiplier).
Quant_size
is the number of bits for
each data value input to the Galaxy decoder.
Quant_mult
is a scalar to be multiplied times each
input data value.
The multiplier improves the performance of the
decoder when using smaller values for
quant_size
(1, 2, or 3 bits). For example, if a system is using 2
soft bits (values range from 0 to 3), and the internal
decoder resolution is set to 5 bits (values range from
0 to 31), then a
quant_mult
of 9 could be used to
increase the range of the input values (new range is
from 0 to 27). The software will automatically add
the correct constant to center the input values in the
internal resolution range.
Quant_mult
must be an odd integer. A general
rule for setting the
quant_mult
is:
4.5
HELICAL INTERLEAVING
The Galaxy core can optionally scramble
(helical interleave) when encoding and descramble
when decoding. Scrambling data spreads bursts of
noise across all axes of the block code for the best
error correction performance in burst channel use.
The scrambling is applied after encoding takes
place. Descrambling takes place before the
decoding operation.
Helical interleaving is applied along a diagonal
path through the encoded block. Data is output
along diagonal lines from the upper left to lower
right corner (for a 2D code). The first diagonal
output starts with the bit row 1, column 1 followed
by the diagonal starting at row 1, column 2. For 3D
codes, instead of reading diagonally through the 2D
array, interleaving reads diagonally through a cube
of data.
The example below shows how interleaving is
applied for a 2D (64,57)x(64,57) code.
Figure 2:
Input Block
Note:
The number reflects the bit order, including
generated ECC bits.
The encoded, scrambled data output is taken along
diagonal lines starting with bit 0 as shown below. The
order of the interleaving is noted for each diagonal line.
Figure 3:
2D Helical Interleaving
For the (64,57)x(64,57) block, the data is: 0, 65,
130, ..., 4095, 1, 66, ..., 4031, 4032, 2, 67, ..., ..., 63,
64, ..., 4094 for a total of 4096 bits output. The
decoder can automatically deinterleave the block to
restore it to its original order.
Figure 4:
Encoded/Interleaved Data Output
Data bits are output from the encoder in row
order from left to right. 3D helical interleaving/
deinterleaving is done by reading/writing cells
diagonally through the x, y, and z dimensions. Note
quant
_
mult
inres
2
quant
_
size
1
–
1
–
------2
≤
0
1
2
3
63
64
65
66
67
127
128 129
191
192 193
4032 4033
4095
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
130
. . .
. . .
. . .
0
1
2
3
63
64
65
66
67
127
128 129
1
191
192 193
4032 4033
4095
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
130
. . .
. . .
. . .
2
4
126
127
3
0
65
130 . . .
4095
1
66
131 . . .
4032
2
67
4033
3
68
63
64
4094
4030
4029
. . .
129
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
132
4031
. . . 3968
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