参数资料
| 型号： | IP-VITERBI/SS |
| 厂商： | Altera |
| 文件页数： | 28/50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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3–2
Chapter 3: Functional Description
Encoding Scheme
Encoding Scheme
Figure 3–1 on page 3–2 shows a convolutional encoder with parameters L = 5, N = 2
and polynomials GA = 19 and GB = 29. GA in decimal is 19, which is equal to 10011 in
binary. The most significant bit of the binary representation is the connection at the
input data bit; the least significant bit represents the connection at the end of the shift
register chain. The XOR function implements the modulo-2 adding operation.
Figure 3–1. Encoding Scheme
RR
Port
ga_xor
MSB
gb_xor
LSB
State Metrics
The Viterbi decoder state metrics are accumulative not Euclidean and are based on
maximum metrics rather than minimum metrics. As the metrics grow, they must be
normalized to avoid overflow. When a normalization occurs the decoder subtracts
2 (bmgwide – 1) from all metrics and increases the normalization register by +1.
The total metric value for the best path = (number of normalizations) × (2 (bmgwide – 1) ) +
bestmet .
The total metric value for the best path, the number of symbols processed, and the
number of errors in the bit error rate (BER) block indicate the quality of the channel
and whether you have a suitable value for softbits . The state that has that best
metric is given in the output bestadd .
Puncturing Scheme
Both parallel and hybrid architectures support external puncturing. All punctured
codes shown are based on a mother code of rate 1/2. For external depuncturing you
must depuncture the received data stream external to the decoder, and input the data
into the decoder n symbols at a time.
Table 3–2 shows some possible puncturing schemes, which can be defined, and their
rate.
Table 3–2. Some Puncturing Schemes (Part 1 of 2)
Punctured
Puncturing Scheme
Viterbi Compiler
2/3
Rate
CA
CB
Bit
(1)
1
1
0
1
Multiplier
November 2013 Altera Corporation
User Guide
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