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Summary: 1
Instantaneous Mutual Information and
Eigen-Channels in MIMO Mobile Rayleigh Fading
Shuangquan Wang, and Ali Abdi, Senior Member, IEEE
Abstract--In this paper, we study two important metrics in
multiple-input multiple-output (MIMO) time-varying Rayleigh
flat fading channels. One is the eigen-channel, and the other
is the instantaneous mutual information (IMI). Their second-
order statistics, such as the correlation coefficient, level crossing
rate (LCR), and average fade/outage duration, are investigated,
assuming a general nonisotropic scattering environment. Exact
closed-form expressions are derived and Monte Carlo simulations
are provided to verify the accuracy of the analytical results. For
the eigen-channels, we found they tend to be spatio-temporally
uncorrelated in large MIMO systems. For the IMI, the results
show that its correlation coefficient can be well approximated
by the squared amplitude of the correlation coefficient of the
channel, under certain conditions. Moreover, we also found the
LCR of IMI is much more sensitive to the scattering environment
than that of each eigen-channel.
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