MIMO wireless channels: capacity and performance prediction

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Keyholes, correlations, and capacities of multielement transmit and receive antennas (2002, background): “In [9], it has been shown that such degenerate channels termed “pinholes”, are extreme cases in a wide family of channels.”
Impact of antenna correlation on the capacity of multiantenna channels (2005, background): “• The keyhole channel, where is given by the outer product of two random vectors with zero-mean independent entries [24], [25].”
Models for MIMO propagation channels: a review (2002, methodology): “Notice that this model is also a special case of the model suggested in [28], we will revisit this shortly.”
A stochastic MIMO radio channel model with experimental validation (2002, background): “Restriction to the Model The pin hole [4] or keyhole [22] effect has been raised in previous work.”
Multiple-antenna capacity in the low-power regime (2003, background): “6This separation applies if the immediate surroundings to each array are responsible for the correlation between its antennas but have no impact on the correlation between the antennas at the other end of the link [40], [41].”
MIMO antenna subset selection with space-time coding (2002, background): “Channel statistics generally depend on large-scale scatterers/distance between the transmitter and receiver [19], [20] and change slowly, if at all, even in mobile environments.”