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» A Computable Spectral Theorem
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WCNC
2010
IEEE
15 years 8 months ago
Frequency Reuse Techniques for Attaining Both Coverage and High Spectral Efficiency in OFDMA Cellular Systems
—Inter-cell interference (ICI) is always a big obstacle to attain wide area coverage and high spectral efficiency in cellular systems. In this work we make a study of two well-kn...
Zheng Xie, Bernhard Walke
COMPGEOM
2005
ACM
15 years 6 months ago
Hadwiger and Helly-type theorems for disjoint unit spheres in R3
Let S be an ordered set of disjoint unit spheres in R3 . We show that if every subset of at most six spheres from S admits a line transversal respecting the ordering, then the ent...
Otfried Cheong, Xavier Goaoc, Andreas Holmsen
CORR
2007
Springer
119views Education» more  CORR 2007»
15 years 4 months ago
Hadwiger and Helly-type theorems for disjoint unit spheres
Let S be an ordered set of disjoint unit spheres in R3 . We show that if every subset of at most six spheres from S admits a line transversal respecting the ordering, then the ent...
Otfried Cheong, Xavier Goaoc, Andreas Holmsen, Syl...
CORR
2010
Springer
91views Education» more  CORR 2010»
15 years 4 months ago
Ultrametric watersheds: a bijection theorem for hierarchical edge-segmentation
Abstract. We study hierachical segmentation in the framework of edgeweighted graphs. We define ultrametric watersheds as topological watersheds null on the minima. We prove that th...
Laurent Najman
FOCS
2009
IEEE
15 years 10 months ago
A Parallel Repetition Theorem for Any Interactive Argument
— The question of whether or not parallel repetition reduces the soundness error is a fundamental question in the theory of protocols. While parallel repetition reduces (at an ex...
Iftach Haitner