%0 Journal Article
%T Achievable Rates for Four-Dimensional Coded Modulation with a Bit-Wise Receiver
%A Alex Alvarado
%A Erik Agrell
%J Computer Science
%D 2013
%I arXiv
%X 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.
%U http://arxiv.org/abs/1310.4149v1