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Summary: Spatial Limits to MIMO Capacity in General
Scattering Environments
Tony S. Pollock, Thushara D. Abhayapala and Rodney A. Kennedy
National ICT Australia
Locked Bag 8001
Canberra ACT 2601, Australia
tony.pollock@nicta.com.au
Abstract--In this paper we present a new upper bound
on the capacity of MIMO systems. By characterizing the
fundamental communication modes of a physical aper-
ture, we develop an intrinsic capacity which is indepen-
dent of antenna array geometries and array signal pro-
cessing. Using a modal expansion for free-space wave
propagation we show that there exists a maximum achiev-
able capacity for communication between spatial regions
of space, which depends on the size of the regions and the
statistics of the scattering environment.
I. INTRODUCTION
Multiple-Input Multiple-Output (MIMO) communi-
cations systems using multi-antenna arrays simultane-
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