Abstract: In this paper we show that the problem of designing
efficient multiple-antenna signal constellations for fading channels
can be related to the problem of finding packings with large minimum
distance in the complex Grassmannian space. We describe a numerical
optimization procedure for finding good packings in the complex
Grassmannian space and report the best signal constellations found by
this procedure. These constellations improve significantly upon
previously known results.
Status:
Technical Memorandum, Bell Laboratories, Lucent Technologies,
September 1998, Submitted to IEEE Trans. Info. Th.
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