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'''Serial concatenated convolutional codes (SCCC)''' are a class of [[forward error correction]] (FEC) codes highly suitable for turbo (iterative) decoding. Data to be transmitted over a noisy channel may first be encoded using an SCCC.
SCCC's were analyzed in the 1990's in a series of publications from NASA's [[Jet Propulsion Laboratory]] (JPL). This research yielded a form of turbo-like serial concatenated codes that 1) were iteratively ('turbo') decodable with reasonable complexity, and 2) gave error correction performance comparable with the [[turbo codes]]. The analysis of SCCCs was spawned in part by the earlier discovery of [[turbo codes]] in 1993.▼
SCCCs typically include an inner code, an outer code, and a linking interleaver. A distinguishing feature of SCCCs is the use of a recursive [[convolutional code]] as the inner code. The recursive inner code provides the 'interleaver gain' for the SCCC, which is the source of the excellent performance of these codes.
▲SCCC's were analyzed in the 1990's in a series of publications from NASA's [[Jet Propulsion Laboratory]] (JPL). This research yielded a form of turbo-like serial concatenated codes that 1) were iteratively ('turbo') decodable with reasonable complexity, and 2) gave error correction performance comparable with the [[turbo codes]]. The analysis of SCCCs was spawned in part by the earlier discovery of [[turbo codes]] in 1993.
Prior forms of [[Concatenated error correction code|serial concatenated codes]] typically did not use recursive inner codes. Additionally, the constituent codes used in prior forms of serial concatenated codes were generally too complex for reasonable soft-in-soft-out ([[Soft-in soft-out decoder|SISO]]) decoding. SISO decoding is considered essential for turbo decoding.
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