L64724 LSI Logic Corporation, L64724 Datasheet - Page 174
L64724
Manufacturer Part Number
L64724
Description
Satellite Receiver
Manufacturer
LSI Logic Corporation
Datasheet
1.L64724.pdf
(294 pages)
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Figure 7.2
Input
Data
7-4
Rate = 1/2
Encoder
Encoded
Viterbi Encoder
Data
Puncturing and Depuncturing Block Diagram
Input
Data
Encoded
Data
Puncture
The L64724 receives the encoded data symbols in QPSK or BPSK
format on the IVIN and QVIN signals. The L64724 receives these
symbols in the order shown on the right of L64724 Input Data in
Figure
insertion of erasures into the received symbol stream before the rate
equal to 1/2 Viterbi decoder module starts decoding.
The FEC Decoder Pipeline
Module
I.1
Q.1
D1
I.2
Q.2
D2
7.2. The depuncturing module handles the reordering and the
Modulator
I.3
Q.3
D3
I.4
Q.4
D4
Channel
Punctured
Comm.
Data
I.5
Q.5
D5
I.6
Q.6
D6
Demod.
I.7
Q.7
D7
Depuncture
Module
I.8
Q.8
D8
FIFO/
L64724
Depunctured
Data
Rate = 1/2
Decoder
Viterbi
Output Data
Decoded
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