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Impact MIMO antenna coupling

The effect of inter-element coupling and the directional response of elements on the channel correlation matrix and hence capacity of the MIMO channel. It makes use of the finite scatterers model of the double-directional wireless channel and the Steyskal model of element coupling.

Most of the results are valid for an arbitrary array, but some are obtained specifically for the case of a ULA with "patch-like" directional response. It is shown that the effect of coupling can be modelled by modifying the directional response of the elements, using the response of the elements taken as part of the array.

It is also shown that coupling affects the array gain, which in turn affects capacity, as well as correlation, which affects capacity in the reverse direction. The effect can be an increase or reduction depending on the phase of the coupling. If the directional responses are all the same the capacity will tend to be reduced compared to omni-directional elements; if they are different this may result in an increase.

Informations connexes

Reported by

University of York
Heslington -
YO1 5DD York
United Kingdom
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