Antenna saturation effects on MIMO capacity
Pollock, T.S.
Abhayapala, T.D.
Kennedy, R.A.
Res. Sch. of Inf. Sci. & Eng., Australian Nat. Univ., Weston Creek, ACT, Australia;
This paper appears in: Communications, 2003. ICC '03. IEEE International Conference on
Publication Date: 11-15 May 2003
Volume: 4,
On page(s): 2301- 2305 vol.4
ISBN: 0-7803-7802-4
INSPEC Accession Number: 7906000
Digital Object Identifier: 10.1109/ICC.2003.1204285
Current Version Published: 2003-06-11
Abstract
A theoretically derived antenna saturation point is shown to exist for MIMO systems, at which the system suffers a capacity growth decrease from linear to logarithmic with increasing antenna numbers. We show this saturation point increases linearly with the radius of the region containing the receiver antennas and is independent of the number of antennas. Using an alternative formulation of capacity for MIMO systems we derive a closed form capacity expression, which uses the physics of signal propagation combined with statistics of the scattering environment. This expression gives the capacity of a MIMO system in terms of antenna placement and scattering environment and show that the saturation effect is due to spatial correlation between receiver antennas.
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