参数资料
| 型号： | IP-VITERBI/SS |
| 厂商： | Altera |
| 文件页数： | 30/50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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3–4
Chapter 3: Functional Description
Trellis Coded Modulation
Consider the use of the 1/2 rate convolutional code ( Figure 3–2 on page 3–4 ) to
encode one information bit while the second information bit is left uncoded. When
used in conjunction with an eight-point signal constellation, for example, eight-PSK,
the two bits select one of the four subsets in the signal constellation, while the
remaining information bit selects one of the two points within each subset.
Figure 3–2. Half-Rate Convolutional Code
c 0
GB
Input
GA
c 1
Uncoded Bit
c 2
Figure 3–2 shows the mapping of the coded bits and sector numbers. The specific
mapping is not important. Other mappings can be devised by permutating subsets in
subsets. IP Toolbench and the testbench create TCM with the mapping shown in
Figure 3–2 . However, it is possible to create any other mapping, including symbol
mappings for 8-PSK, 16-PSK and others.
1
If you create another mapping, you must correctly connect the branch metrics created
outside the MegaCore function to the input ports and correctly configure the
polynomials GA and GB for the trellis generation.
Figure 3–3. Mapping of Coded Bits & Sector Numbers
011
010
2
1
001
100
3
4
0
7
000
101
5
6
110
111
Viterbi Compiler
User Guide
November 2013 Altera Corporation
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| IPW 2819 | 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW 11INX7.5IN 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW, 11INX7.5IN 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW, 11INX7.5IN; For Use With:Front Panel Mounted Meters; Enclosure Material:-; IP Rating:(Not Available); Highest NEMA Rating:4X; External Height - Imperial:11"; External Width - Imperial:7.5"; NEMA Type:4X ;RoHS Compliant: Yes |
| IPW 2819-G | 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW 11INX7.5IN 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW, 11INX7.5IN; For Use With:Front Panel Mounted Meters; Enclosure Material:-; IP Rating:(Not Available); Highest NEMA Rating:4X; External Height - Imperial:11"; External Width - Imperial:7.5"; NEMA Type:4X ;RoHS Compliant: Yes |
| IPW 2828 | 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW 11INX11IN 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW, 11INX11IN; For Use With:Front Panel Mounted Meters; Enclosure Material:-; IP Rating:(Not Available); Highest NEMA Rating:4X; External Height - Imperial:11"; External Width - Imperial:11"; NEMA Type:4X ;RoHS Compliant: Yes |
| IPW 3819 | 制造商:FIBOX 功能描述:Inspection Window 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW, 15INX7.5IN, For Use With:Front Panel Mounted Meter 制造商:FIBOX 功能描述:INSTRUMENT PROTECTION WINDOW, 15INX7.5IN, For Use With:Front Panel Mounted Meters, Enclosure Material:-, IP Rating:-, NEMA Rating:4X, External Height - Imperial:15", External Width - Imperial:7.5", External Width - Metric:191mm , RoHS Compliant: Yes |
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