title: LDPC coded OFDM over the atmospheric turbulence channel.
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 20.2 dB for quadrature-phase-shift keying (QPSK) and by 23.4 dB for binary-phase-shift keying (BPSK).
authors: University of Arizona, Department of Electrical and Computer Engineering, Tucson, AZ 85721, USA. ivan@ece.arizona.edu
authors: Ivan B
authors: IB
authors: Djordjevic
authors: Bane
authors: B
authors: Vasic
authors: Mark A
authors: MA
authors: Neifeld