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參數(shù)資料
| 型號： | 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)： | 8/23頁 |
| 文件大?。?/td> | 435K |
| 代理商： | GALAXY |
comtech
aha
corporation
PSGalaxy_STK_0100
A subsidiary of Comtech Telecommunications Corporation
Page 5 of 20
that the data rate drops when interleaving and/or
deinterleaving.
4.6
SHORTENING
Shortening refers to removing a specific number
of data symbols from an X, Y, or Z axis (
Xshort
,
Yshort
, and
Zshort
parameters), removing data
symbols from the code block (
shortb
), or removing
rows of data symbols from the code block (
shortr
).
The purpose of applying shortening is to adjust a code
size down to exactly match a particular application’s
required size and channel rate. The way shortening is
implemented is that leading data symbols or rows of
symbols are removed. The decoder knows the block
size and shortening parameters and can insert zeroes
into the code block in place of the shortened values
for purposes of decoding. After the block is decoded
these inserted zeroes are then removed before
outputting the corrected data block. For more
information on shortening TPCs, please refer to
application note: ANTPC02.
5.0
AHA TPC SIMULATION
SOFTWARE
The AHA TPC Simulation Software allows the
user to model the performance of Turbo Product
Codes (TPCs). The TPCs are fully configurable and
support the Galaxy library of Turbo Product Codes.
The software is designed to run under Windows
(95, 98, or NT4.0).
This software is the property of Comtech AHA
Corporation (AHA) and is protected under the terms
outlined in the software license agreement (see Help-
About AHA TPC Simulation).
5.1
GRAPH/CONTROL WINDOW
In this window, the TPC Simulation software
generates Eb/No vs. Bit Error Rate (BER) curves
showing the performance of the code programmed
in the Configuration/Currently Plotting window. All
the settings (Codes, Iterations, Quantization,
Feedback, etc.) for how the Galaxy core would
perform are configured in the registers.
The simulation setup for Bit Error Rate (BER)
curve generation is as follows:
1) Random data is input to a TPC encoder.
The binary output of the encoder is converted
to channel symbols. For this simulation, a
binary ‘1’ is converted to a floating point
1.0 value, while a binary ‘0’ is converted
to a floating point -1.0 value.
Additive White Gaussian Noise (AWGN) is
added to the channel symbols, according to
the Energy per Bit vs. Noise power (Eb/
N0) setting chosen. This Eb/N0 value
takes into account the code rate.
The received noisy channel data is quantized
into soft decision values with the number
of bits set in
quant_size
in the Register
Configuration window.
These soft values are sent to the TPC decoder.
The output of the decoder is compared with the
original data. All bit errors are counted.
The BER is computed as bits in error out
of decoder divided by total bits
transmitted.
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