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Some results on the sum-rate capacity of MIMO fading broadcast channels

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2 Author(s)
Xie, Yongzhe ; Prediction Co., Santa Fe, NM, USA ; Georghiades, C.N.

We study the ergodic sum-rate capacity of the fading MIMO broadcast channel which is used to model the downlink of a cellular system with Nt transmit antennas at the,base and K mobile users each having Nr receive antennas. Assuming perfect channel state information (CSI) for all users is available at the transmitter and the receivers, we evaluate the sum-rate capacity numerically using the duality between uplink and downlink. Assuming Nt K, we also derive both upper and lower bounds on the sum-rate capacity to study its increase rate due to multi-user diversity. Finally, we compare three transmission schemes which use the single-user-MIMO scheme (SU-MIMO), ranked known interference (RKI) and zero-forcing beamforming (ZFB), respectively, to transmit to a selected set of users in order to approach the sum-rate capacity. We show that both ZFB and RKI outperform SU-MIMO in a cellular downlink scenario. when many mobile users are present.

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Wireless Communications, IEEE Transactions on  (Volume:5 ,  Issue: 2 )