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Summary: SPATIAL LIMITS TO MUTUAL INFORMATION SCALING IN MULTI-ANTENNA
SYSTEMS
Tony S. Pollock, Michael I. Y. Williams, and Thushara D. Abhayapala
Wireless Signal Processing Program, National ICT Australia,
and
Department of Information Engineering, The Australian National University
Level 2, Mining Industry House, 216 Northbourne Avenue
Braddon ACT 2612, Australia
{tony.pollock,michael.williams,thushara.abhayapala}@nicta.com.au
ABSTRACT
Previous results have shown significant capacity gains by
employing multiple antennas at both transmitter and receiver,
however, due to physical size restraints (particularly at the
receiver) these may not be obtained. In this paper we con-
sider the capacity behaviour of multi-antenna systems when
the receiver sampling is constrained to a finite region of
space. By characterizing the wavefield generated at the re-
ceiver due to transmitted signals and the scattering environ-
ment, a theoretically derived sampling threshold is shown
to exist, at which the capacity growth is reduced from linear
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