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Multi-Stage Threshold Decoding of High Rate Convolutional Codes for Optical Communications

Authors:
Muhammad Ahsan Ullah
Ryousuke Omura
Takuma Sato
Haruo Ogiwara

Keywords: threshold decoding, convolutional codes, self-orthogonal codes, optical transport network.

Abstract:
For 100 Gb/s optical transport network, researchers are searching a suitable error correction coding scheme that can provide coding gain more than 10 dB at the bit error rate less than $10^{-12}$, provided that the redundancy does not exceed 20 percent. This paper presents a least complex error correction coding scheme based on iterative threshold decoding called multi-stage threshold decoding with difference register (MTD) for the 100 Gb/s optical transport network. High rate (code rate 0.8) self-orthogonal convolutional codes are considered. The MTD achieves lower bound error performance of maximum likelihood decoding at higher bit energy to noise density ratio. The codes with orthogonal checking 10 and larger satisfy the requirements of 100 Gb/s optical transport network. The bit error rate of MTD with parity check decoding becomes less than 1/100 times in the error floor region compared to ordinary MTD. The MTD based decoding with parity check decoding for the code with orthogonal checking 12 produces 10.60 dB coding gain at the bit error rate $10^{-15}$. The coding gain further improves 0.25 dB in the waterfall region by using 2-step decoding.

Pages: 87 to 93

Copyright: Copyright (c) IARIA, 2011

Publication date: March 20, 2011

Published in: conference

ISSN: 2308-4030

ISBN: 978-1-61208-123-6

Location: St. Maarten, The Netherlands Antilles

Dates: from March 20, 2011 to March 25, 2011