Dimensionality Loss in MIMO Communication Systems

S. Loyka and A. Koaki (Canada)


MIMO Channels, Capacity, Correlation


Traditional viewpoint is that the effect of correlation is to decrease MIMO capacity. In this paper, the effect of correlation is studied from a different perspective: a concept of effective dimensionality (ED) of a MIMO system is introduced and investigated using the correlation matrix approach. It is shown that the channel correlation results in ED decrease. Simple formulas, which give an explicit dependence of ED on the channel correlation, are given for practically-important cases. A comparison of the ED concept with the recently-introduced concept of effective degrees of freedom is presented.

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