Abstract

Low-density parity-check (LDPC) coded optical orthogonal frequency division multiplexing (OFDM) is shown to significantly outperform LDPC coded on-off keying (OOK) over the atmospheric turbulence channel in terms of both coding gain and spectral efficiency. In the regime of strong turbulence at a bit-error rate of 10^-5, the coding gain improvement of the LDPC coded single-side band unclipped-OFDM system with 64 sub-carriers is larger than the coding gain of the LDPC coded OOK system by 20.2dB for quadrature-phase-shift keying (QPSK) and by 23.4dB for binary-phase-shift keying (BPSK).

© 2007 Optical Society of America

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History
Original Manuscript: February 7, 2007
Manuscript Accepted: April 30, 2007
Revised Manuscript: April 30, 2007
Published: May 8, 2007

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Author Affiliations

Ivan B. Djordjevic, Bane Vasic, Mark A. Neifeld

University of Arizona

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