参数资料
| 型号： | IP-VITERBI/SS |
| 厂商： | Altera |
| 文件页数： | 29/50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
Trellis Coded Modulation
Table 3–2. Some Puncturing Schemes (Part 2 of 2)
3–3
Punctured
Puncturing Scheme
Rate
Bit
(1)
Multiplier
3/4
CA
CB
1
1
0
1
1
0
4/5
CA
CB
1
1
0
1
0
1
0
1
5/6
CA
CB
1
1
0
1
1
0
0
1
1
0
6/7
CA
CB
1
1
0
1
0
1
1
0
0
1
1
0
7/8
CA
CB
1
1
1
0
1
0
1
0
0
1
1
0
0
1
Note to Table 3–2 :
(1) CA refers to the most significant (first transmitted bit, first received symbol); CB refers to the least significant (last
transmitted bit, last received symbol).
Trellis Coded Modulation
Trellis coded modulation (TCM) combines modulation and encoding processes to
achieve better efficiency without increasing the bandwidth.
Bandwidth-constrained channels operate in the region where R / W > 1, where R =
data rate and W = bandwidth available. For such channels digital communication
systems use bandwidth efficient multi-level phase modulation. For example, phase
shift keying (PSK), phase amplitude modulation (PAM), or quadrature amplitude
modulation (QAM).
When TCM is applied to a bandwidth-constrained channel, a performance gain
results without expanding the signal bandwidth. An increase in the number of signal
phases from four to eight requires approximately 4 dB in additional signal power to
maintain the same error rate. Hence, if TCM is to provide a benefit, the performance
gain of the rate 2/3 code must overcome this 4-dB penalty. If the modulation is an
integral part of the encoding process and is designed in conjunction with the code to
increase the minimum Euclidian distance between the pairs of coded signals, the loss
from the expansion of the signal set is easily overcome and significant coding gain is
achieved with relatively simple codes.
Any bandwidth-constrained system benefits from this technique, for example,
satellite modem systems.
The Altera Viterbi decoder in TCM mode only supports N = 2 (only mother code rates
of 1/2).
November 2013
Altera Corporation
Viterbi Compiler
User Guide
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