参数资料
| 型号： | IP-VITERBI/SS |
| 厂商： | Altera |
| 文件页数： | 33/50页 |
| 文件大小： | 0K |
| 描述： | IP VITERBI LOW-SPEED |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | MegaCore |
| 功能： | Viterbi 低速编译器 |
| 许可证： | 初始许可证 |
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Chapter 3: Functional Description
3–7
Trellis Coded Modulation
Figure 3–6 shows the conversion of a received symbol into four branch metrics and a
sector number. The decoder calculates the distances to the nearest four symbol points
as an unsigned number in the range 0...00 to 1...11 (number of softbits). Where the
range is equal to the radius of the symbol map. Because the decoder works with
accumulative metrics (not Euclidean metrics), the decoder inverts these distances (000
becomes 111; 001 becomes110).
Figure 3–6. Conversion of Received Symbol into Four Branch Metrics
Branch Metric 3
Received Symbol
Branch Metric 2
011
Branch Metric 1
Branch Metric 0
010
2
001
100
101
110
000
111
For example, Figure 3–6 shows a received symbol that has landed in sector number 2
with the following distances to the four nearest symbol map points:
■
■
■
■
1111
1101
1011
0001
Where the distance of the radius for 4 softbits is 1111. The distance are inverted to
obtain the following branch metrics:
■
■
■
■
Branch metric 0 = 0000
Branch metric 1 = 0010
Branch metric 2 = 0100
Branch metric 3 = 1110
November 2013
Altera Corporation
Viterbi Compiler
User Guide
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