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In this article, we identify some of the key problems encountered when designing noncoherent (NC) multiple- input, multiple-output (MIMO) downlink (DL) synchronization schemes for communicating over multipath fading channels. Our main objectives are to illustrate the information-theoretic features and to provide design guidelines for the initial synchronization of NC MIMO systems. We conclude by outlining the relationships between the beneficial and detrimental design factors.
Date of Publication: Dec. 2012