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DSP56300 Datasheet(PDF) 36 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) 36 Page - Freescale Semiconductor, Inc

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3-8
Viterbi Decoder Implementation
Expanding the Viterbi Algorithm
Creating the Branch Metrics
Table 3-1
Recreated Encoder Outputs
The code needed to implement the values in this table appears in Example 3-2.
State
Input
Bit
Encoder
Output
Map Encoder Output to
Branch Metric
Branch Metric for Example
Decoder 10 Input
00000
1
11
B0+B1
16 + (-16) = 0
00001
1
01
-B0+B1
(-16) + (-16) = -32
00010
1
10
B0-B1
32
00011
1
00
-B0-B1
0
00100
1
00
-B0-B1
0
00101
1
10
B0-B1
32
00110
1
01
-B0+B1
-32
00111
1
11
B0+B1
0
01000
1
10
B0-B1
32
01001
1
00
-B0-B1
0
01010
1
11
B0+B1
0
01011
1
01
-B0+B1
-32
01100
1
01
-B0+B1
-32
01101
1
11
B0+B1
0
01110
1
00
-B0-B1
0
01111
1
10
B0-B1
32
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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