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JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 21, NO. 3, MARCH 2003 727 On Turbo Code Decoder Performance in
 

Summary: JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 21, NO. 3, MARCH 2003 727
On Turbo Code Decoder Performance in
Optical-Fiber Communication Systems
With Dominating ASE Noise
Yi Cai, Member, IEEE, Joel M. Morris, Senior Member, IEEE, Tülay Adali, Senior Member, IEEE, and
Curtis R. Menyuk, Fellow, IEEE, Fellow, OSA
Abstract--In this paper, we study the effects of different ASE
noise models on the performance of turbo code (TC) decoders.
A soft-decoding algorithm, the Bahl, Cocke, Jelinek, and Raviv
(BCJR) decoding algorithm [1], is generally used in the TC de-
coders. The BCJR algorithm is a maximum a posteriori probability
(MAP) algorithm, and is very sensitive to the noise statistics. The
Gaussian approximation of the ASE noise is widely used in the
study of optical-fiber communication systems [2]­[8], and there
exist standard TCs for additive white Gaussian noise (AWGN)
channels. We show that using a MAP decoding algorithm based
on the Gaussian noise assumptions, however, may significantly
degrade the TC decoder performance in an optical-fiber channel
with non-Gaussian ASE noise. To take full advantage of TC, the
accurate noise statistics in optical-fiber transmissions should be

  

Source: Adali, Tulay - Department of Computer Science and Electrical Engineering, University of Maryland, Baltimore County

 

Collections: Engineering