A search over basis matrices for bit-labeling in D4 and E8 Voronoi constellations yields 0.1 dB gain for D4 and 0.5 dB gain for E8 at BER of 10^{-4} versus standard bases.
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Optimizing Bit-Labeling of Voronoi Constellations
A search over basis matrices for bit-labeling in D4 and E8 Voronoi constellations yields 0.1 dB gain for D4 and 0.5 dB gain for E8 at BER of 10^{-4} versus standard bases.