A Comparison of Time-Sharing, DPC, and Beamforming for MIMO Broadcast Channels With Many Users

By Masoud Sharif, Babak Hassibi. IEEE Transactions on Communications, 2007

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Towards 1 Gbps/UE in Cellular Systems: Understanding Ultra-Dense Small Cell Deployments (2015, background): “Such type of scheduling leads to multiuser diversity gains, which have been shown to roughly follow a double logarithm scaling law in terms of capacity with regard to the number of UEs per BS in macrocell scenarios [79].”
On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming (2006, background): “Moreover, it has been shown that if the beamforming vectors are chosen optimally, the sum rate of BF approaches that of DPC as the number of users goes to infinity [ 4 ].”
Dirty-paper coding versus TDMA for MIMO Broadcast channels (2005, background): “Large K If the number of antennas and the SNR are kept fixed and the number of users is taken to be large, it is shown in [17] that the dirty paper gain converges to M N , i.”
Multi-Antenna Downlink Channels with Limited Feedback and User Selection (2007, background): “This is in contrast to previous findings that the sum-rate increase by the multiuser diversity is only by a factor of log log K [3].”