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Summary: Proceedings 4th Australian Communication Theory Workshop 2003 7
Fundamental Limits of MIMO Capacity for
Spatially Constrained Arrays
Tony S. Pollock, Thushara D. Abhayapala, and Rodney A. Kennedy
Abstract--In this paper we investigate the capacity behavior of
spatial constrained multiple-antenna array communications. By
increasing the number of antennas within a fixed region of space
the antenna array becomes dense and spatial correlation inhibits
capacity growth. Using a novel spatial channel model we show
that the underlying physics of wave propagation limits the capacity
of constrained arrays. A theoretically derived antenna saturation
point is shown to exist for dense array MIMO systems, at which
there is no capacity growth with increasing antenna numbers. We
show this saturation point increases linearly with the radius of the
region, and that it naturally lends itself to a definition for the the-
oretical maximum capacity for a fixed region of space.
Index Terms-- MIMO, wireless, capacity, diversity, multiele-
ment antenna arrays, dense arrays.
I. INTRODUCTION
Multiple-Input Multiple-Output (MIMO) communications
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