-11 can be achieved by serial concatenation of a Reed-Solomon code and a turbo code for Q-factor lower than 8.0 dB with a bandwidth expansion ratio of 33.3%." />


A Study on Turbo Soft-Decision Decoding for Hard-Detected Optical Communication Signals

Chen ZHENG  Takaya YAMAZATO  Hiraku OKADA  Masaaki KATAYAMA  Akira OGAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E86-B   No.3   pp.1022-1030
Publication Date: 2003/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission
Keyword: 
turbo decoding,  error-detected reliability,  error-detected state,  optical fiber communication,  

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Summary: 
We propose a method to realize soft-decision decoding for hard-detected signals. In this paper, a novel concept is introduced as "error-detected reliability. " The method is very useful for optical fiber communications (OFC) as hard detection is the only detection method for the OFC systems. We demonstrate our proposed method using the turbo code in which soft information is required for decoding. As a result, the simulation shows slight difference in the range of moderate to high signal-to-noise ratio between the proposed decoding scheme and the conventional turbo decoding scheme. Moreover, the bit error rate of 10-11 can be achieved by serial concatenation of a Reed-Solomon code and a turbo code for Q-factor lower than 8.0 dB with a bandwidth expansion ratio of 33.3%.