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DSP56300 Datasheet(PDF) 27 Page - Freescale Semiconductor, Inc

Part # DSP56300
Description  Implementing Viterbi Decoders Using the VSL Instruction on DSP Families
PDF  108 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56300 Datasheet(HTML) 27 Page - Freescale Semiconductor, Inc

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The Viterbi Algorithm
Algorithmic Enhancements
Viterbi Decoder Implementation
2-13
Figure 2-8
Encoder Tap Symmetry to Reduce Calculations
00100
10100
01000
01001
11
00/0
11/2
Decoder
input
S1
S0
S2
S3
S4
1
D
D2
D3
D4
D5
00100
10100
01000
01001
S1
S0
S2
S3
S4
1
D
D2
D3
D4
D5
11/2
00/0
If all polys have
taps at the input
,
branches into the
same state will
have complement
branch metrics.
If all polys have
taps at the last (S4)
state bit, branches
into the lower state
pair will be flipped
versions of the
upper state
branches.
1
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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