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== RSC Codes ==
[[File:Two-state_RSC_code.png|thumb|340px|none|Img. 3. Two-state recursive systematic convolutional (RSC) code. Also called an 'accumulator.' Useful for LDPC codes and inner constituent code for serial concatenated convolutional codes (SCCC's).]]
[[File:Four-state_RSC_code.png|thumb|340px|none|Img. 4. Four-state RSC code. Useful for SCCC's.]]
[[File:Sixteen-state_RSC_code.png|thumb|340px|none|Img. 5. Sixteen-state RSC code. Useful for low error rate turbo codes for applications such as satellite links. Suitable as outer code for SCCC's.]]
== Performance ==
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