Altera Viterbi Compiler Manual de usuario Pagina 31

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Parameter Description
Number of bits per block
The number of bits per block.
The number of bits per block × the number of blocks must be less than
50,000,000.
Signal to noise ratio (dB) The signal to noise ratio, which must be between 1 and 100.
Number of blocks
The number of blocks.
The number of bits per block × the number of blocks must be less than
50,000,000.
Pattern A Enter the puncturing pattern A.
Pattern B Enter the puncturing pattern B.
External Puncturing
Both parallel and hybrid architectures support external puncturing.
All punctured codes 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 3-4: Puncturing Schemes
You can define these schemes and their rate. CA refers to the most significant (first transmitted bit, first received
symbol); CB refers to the least significant (last transmitted bit, last received symbol)
Punctured
Rate
Puncturing Scheme
Bit Multiplier
2/3
CA 1 0
CB 1 1
3/4
CA 1 0 1
CB 1 1 0
4/5
CA 1 0 0 0
CB 1 1 1 1
5/6
CA 1 0 1 0 1
CB 1 1 0 1 0
6/7
CA 1 0 0 1 0 1
CB 1 1 1 0 1 0
7/8
CA 1 1 1 1 0 1 0
CB 1 0 0 0 1 0 1
UG-VITERBI
2014.12.15
External Puncturing
3-13
Viterbi IP Core Functional Description
Altera Corporation
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