Iteratively decodable codes on m flats for WDM high-speed long-haul transmission

Sundararajan Sankaranarayanan, Ivan B Djordjevic, Bane V Vasic

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In an earlier paper, we reported that the low-density parity-check (LDPC) codes from finite planes outperform any other known forward error-correction (FEC) scheme for optical communications. However, the number of different LDPC codes of code rate above 0.8 is rather small. As a natural extension of the prior work, in this paper, we consider LDPC codes on m flats derived from projective and affine geometries, which out-perform codes from finite planes. The codes on m flats also provide a greater selection of structured LDPC codes of rate 0.8 or higher. The performance of the codes in a long-haul optical-communication system was assessed using an advanced simulator able to capture all important transmission impairments. Specifically, they achieve a coding gain of 10 dB at a bit error rate (BER) of 10-9, outperforming, therefore, the best turbo product codes proposed for optical communications. In addition, the simulator implements a fixed-point (FP) iterative decoder that allows control of the precision of the soft information used in the decoder. Such quantization is required to facilitate hardware implementations of the iterative decoder, and the high-speed operations for long-haul optical transmission systems. The loss in performance due to reduced precision of the soft information can be as low as 0.2 dB.

Original languageEnglish (US)
Pages (from-to)3696-3701
Number of pages6
JournalJournal of Lightwave Technology
Volume23
Issue number11
DOIs
StatePublished - Nov 2005

Fingerprint

Optical communication
Wavelength division multiplexing
high speed
Simulators
Forward error correction
decoders
parity
Light transmission
Bit error rate
optical communication
Communication systems
Hardware
simulators
Geometry
projective geometry
impairment
bit error rate
telecommunication
hardware
coding

Keywords

  • Finite geometries
  • Forward error correction (FEC)
  • Low-density parity-check (LDPC) codes
  • M flats
  • Optical communications

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

Cite this

Iteratively decodable codes on m flats for WDM high-speed long-haul transmission. / Sankaranarayanan, Sundararajan; Djordjevic, Ivan B; Vasic, Bane V.

In: Journal of Lightwave Technology, Vol. 23, No. 11, 11.2005, p. 3696-3701.

Research output: Contribution to journalArticle

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