Achievable Rates of Multidimensional Multisphere Distributions
01 June 2017
The maximum achievable rate or mutual information of multidimensional multisphere distributions in arbitrary dimensions in the presence of additive white Gaussian noise is derived. At high signal-to-noise ratios, 4-dimensional multisphere constellations offer higher achievable rates than 2-dimensional ones transmitted on each of the two polarizations of the optical carrier.