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The optimal set of multiplexing gain tuples for the users in a broadcast network with K receivers having Nr antennas each and Nt antennas at the base station, given a minimum diversity gain constraint of d for each user, is investigated. An outer bound on this region is computed by analyzing the outage probability, where outage is defined as the event that the given rate tuple lies outside the capacity...
In [1], the authors proposed the GRT-VB spatial multiplexing architecture that significantly improves upon the diversity-multiplexing (D-M) tradeoff of the V-BLAST architecture by feeding back a channel dependent permutation matrix (denoting antenna order) via a few bits (log Mt!) of feedback. In this paper, it is shown that with the same antenna order feedback, if coding across the resulting parallel...
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