Duality, achievable rates, and sum-rate capacity of Gaussian MIMO broadcast channels
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...An alternative to a point-to-point MIMO system is a multiuser MIMO system [3], [4], [5], [6] in which an antenna array simultaneously serves a multiplicity of autonomous terminals....
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"Duality, achievable rates, and sum-..." refers methods in this paper
...In pioneering work by Caire and Shamai [5], a set of achievable rates (the achievable region) for the MIMO BC was obtained by applying the “dirty paper” result [ 6 ] at the transmitter (or alternatively, coding for noncausally known interference)....
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...In [8], the region was extended to the more general multiple-user, multiple-antenna case using the following extension of dirty paper coding [ 6 ] to the vector case....
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"Duality, achievable rates, and sum-..." refers background in this paper
...It was also shown in [5], [7], that the sum rate MIMO BC capacity equals the maximum sum rate of this achievable region for the two-user BC with an arbitrary number of transmit antennas and one receive antenna at each receiver ....
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