The capacity of MIMO wireless systems with mutual coupling
- 25 June 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2 (10903038), 696-700
- https://doi.org/10.1109/vetecf.2002.1040688
Abstract
MIMO wireless systems employing antenna arrays with close inter-element spacings exhibit a high degree of mutual coupling. In this case, the channel transfer matrix is a function of the matching network employed for transmitting and receiving. Existing capacity expressions are inappropriate, since the maximum mutual information will depend on antenna element loading. This paper develops a new expression for capacity that includes the effect of mutual coupling and antenna matching. Two simple noise models for realistic high-frequency circuits are introduced. Capacity is computed by maximizing the mutual information in these models subject to a new radiated power constraint. Numerical simulations of realistic two-element arrays demonstrate the basic technique.Keywords
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