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Achievable Rates for Four-Dimensional Coded Modulation with a Bit-Wise Receiver

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Abstract

We study achievable rates for four-dimensional (4D) constellations for spectrally efficient optical systems based on a (suboptimal) bit-wise receiver. We show that PM-QPSK outperforms the best 4D constellation designed for uncoded transmission by approximately 1 dB. Numerical results using LDPC codes validate the analysis.

© 2014 Optical Society of America

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