466 research outputs found
Fading-Resilient Super-Orthogonal Space-Time Signal Sets: Can Good Constellations Survive in Fading?
In this correspondence, first-tier indirect (direct) discernible
constellation expansions are defined for generalized orthogonal designs. The
expanded signal constellation, leading to so-called super-orthogonal codes,
allows the achievement of coding gains in addition to diversity gains enabled
by orthogonal designs. Conditions that allow the shape of an expanded
multidimensional constellation to be preserved at the channel output, on an
instantaneous basis, are derived. It is further shown that, for such
constellations, the channel alters neither the relative distances nor the
angles between signal points in the expanded signal constellation.Comment: 10 pages, 0 figures, 2 tables, uses IEEEtran.cls, submitted to IEEE
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