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Some Insights into MIMO Mutual Information: The High SNR Case

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4 Author(s)
Salo, J. ; Eur. Commun. Eng. Ltd., Espoo ; Suvikunnas, Pasi ; El-Sallabi, H.M. ; Vainikainen, P.

We consider mutual information of multiple-input multiple-output (MIMO) wireless channels with complex isotropic Gaussian input in the case where the receiver has perfect channel, knowledge. For arbitrary fading statistics, a mutual information lower bound is decomposed in a sum of three terms involving: a) average SNR; b) channel fading; and c) a term characterizing the "effective rank", or eigenvalue dispersion, of the channel matrix. The decomposition suggests that spatial multiplexing efficiency of a MIMO channel can be characterized by the so-called ellipticity statistic. Distribution functions, means and variances of the random terms in the decomposition for the case of Rayleigh fading are also derived

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Wireless Communications, IEEE Transactions on  (Volume:5 ,  Issue: 11 )