VSC6134
Datasheet
1.2.3.1
Iterative Decoding with Concatenated Codes
The VSC6134 device uses iterative encoding and decoding with concatenated BCH-BCH codes. The
following figure shows the iterative decoding scheme.
Figure 3. BCH-BCH Iterative Decoding Scheme
Inter-
leaver
De-
inter-
leaver
Inter-
leaver
De-
inter-
leaver
Inter-
leaver
Outer BCH
Encoder
Inner BCH
Encoder
BCH
Decoder #1
BCH
Decoder #2
Encoder
De-
inter-
leaver
BCH
Decoder #3
BCH
Decoder #4
Decoder
1.2.3.2
Error Correcting Performance
The following figure shows the bit error ratio (BER) enhancement due to RS coding alone and
concatenated iterative BCH-BCH coding. The EFEC code provides approximately 8.4 dB (theoretical),
while the non-EFEC code provides approximately 6.2 dB.
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VMDS-10185 Revision 4.0
July 2006
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
