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The performance of Multiple-Input Multiple-Output (MIMO) systems heavily relies on the rich scattering propagation environment of wireless links. Specifically, rank deficiency of the channel matrix due to the keyhole effect of multiple antenna channels causes a decrease of the spatial multiplexing and diversity gains in MIMO systems. So far, there has been a limited number of research works considering such keyhole effects on the performance of MIMO relay networks. To the best of the authors' knowledge, only Souihli and Ohtsuki have very recently attempted to investigate the effect of keyhole for MIMO relay systems.
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