New decoding scheme for product accumulate code over an optical PPM channel |
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Authors: | Jian-zhong Guo |
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Affiliation: | (1) Nokia Inc., 6000 Connection Drive, Irving, TX 75039, USA;(2) Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106-9560, USA |
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Abstract: | A new decoding scheme for product accumulate (PA) code over a space optical Poisson/pulse-position modulation (PPM) channel
is investigated. In this scheme, the PPM and the accumulator of the PA code are taken as a single inner code, decoded with
an iterative demodulating-decoding technique based on Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm, rather than belief propagation
(BP) algorithm in the original scheme. Simulation results show that this scheme provides much better bit error rate (BER)
performance. At a BER of 10−5, the new scheme has a gain of 1.8 dB more than the original one. In addition, extrinsic information transfer (EXIT) charts
are employed to analyze and compare the performance. The results indicate that the new scheme has not only better BER performance,
but also lower error floor. |
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Keywords: | |
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