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參數(shù)資料
| 型號(hào)： | DSP56600 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Implementing Viterbi Decoders Using the VSL Instruction on DSP Families |
| 中文描述： | 維特比解碼器實(shí)現(xiàn)上使用DSP的家庭教學(xué)的VSL |
| 文件頁(yè)數(shù)： | 41/108頁(yè) |
| 文件大?。?/td> | 726K |
| 代理商： | DSP56600 |
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Expanding the Viterbi Algorithm
Traceback: Obtaining the Decoder Output
Viterbi Decoder Implementation
For More Information On This Product,
Go to: www.freescale.com
3-13
For other codes that do not use this assumption, traceback can either begin at state 0
anyway (relying on the convergence of paths to give the correct output at the traceback
depth) or the decoder can search for the state with the maximum path metric to begin
the traceback.
3.6
TRACEBACK: OBTAINING THE DECODER OUTPUT
This section presents the code needed to obtain the decoder output from the stored path
data. For this example, we have data organized in blocks of 168 bits. Because the encoder
is flushed to the zero state at the end, and the data for all 168 bits is stored, the traceback
can obtain the entire block at once. The most complicated portion of this code is the need
to obtain the pointer to the next previous state from the current path data.
The code listings for storage and traceback appear in
Example 3-3
and
Example 3-4
,
respectively.
F
Freescale Semiconductor, Inc.
n
.
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