Serial concatenated convolutional codes: Difference between revisions

Revision as of 17:27, 13 May 2014

Revision as of 17:32, 13 May 2014

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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. Upon reception, the coding may be use to remove any errors introduced during transmission. The decoding is performed by repeated decoding and [de]interleaving of the received symbols.

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.

The analysis of SCCCs was spawned in part by the earlier discovery of [[turbo codes]] in 1993. This analysis of SCCC's weretook analyzedplace in the 1990's in a series of publications from NASA's [[Jet Propulsion Laboratory]] (JPL). ThisThe research yieldedoffered SCCC's as 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.