SLM-3650 Satellite Modem
Revision 3
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MN/SLM3650.IOM
A–63
A.2.1.2
Theory of Operation
The Reed-Solomon Codec works in conjunction with the interface card to provide
concatenated convolutional encoding and decoding.
The two main sections of the Codec are:
•
Reed-Solomon encoder (Section A.2.1.3)
•
Reed-Solomon decoder (Section A.2.1.4)
A.2.2 Reed-Solomon
Encoder
A block diagram of the Reed-Solomon encoder section is shown in Figure A-16.
The Reed-Solomon encoder section includes the following circuits:
•
Synchronous
Scrambler
•
Reed-Solomon Codec (encoder section)
•
Serial/Parallel
Converter
•
RAM
Interleaver
•
Parallel/Serial
Converter
U4
U3
U4
U1
U4
JP2
JP2
TXSATDAT
TXSATCLK
U4
U4
MUXDATA
(SERIAL)
MUXCLK
SERIAL
TO PARALLEL
CONVERTER
RS CODEC
(ENCODER SECTION)
UNIQUE WORD
INSERTION
RAM
INTERLEAVER
INTERLEAVER
ADDRESS
GENERATOR
RS TIMING CONTROLLER
PARALLEL
TO SERIAL
CONVERTER
SYNCHRONOUS
SCRAMBLER
JP2
JP2
Figure A-16. Reed-Solomon Encoder Section Block Diagram
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