Multi-Antenna Downlink Channels with Limited Feedback and User Selection

By Taesang Yoo, Nihar Jindal, Andrea J. Goldsmith. IEEE Journal on Selected Areas in Communications, 2007

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Multiuser MIMO Achievable Rates With Downlink Training and Channel State Feedback (2007, methodology): “The beamforming vector v̂k is chosen in the one-dimensional nullspace of Sk; as a result v̂k is independent of the channel estimate ĥk and of the true channel vector hk. 4) Dedicated Training: Once the the BS has computed the beamforming vectors V̂, coherent detection of data at each UT is enabled…”
Joint Transmit Beamforming for Multiuser MIMO Communications and MIMO Radar (2019, background): “Alternatively, in frequency-division duplex mode, downlink channel can be obtained via channel feedback from the users, see, e.g., [56].”
Non-orthogonal Multiple Access in a Downlink Multiuser Beamforming System (2013, methodology): “As a simple and practical alternative, zero-forcing beamforming (ZFBF) has been used to achieve maximum capacity under perfect channel state information at the transmitter (CSIT) [6]-[9].”
Compressive sensing based channel feedback protocols for spatially-correlated massive antenna arrays (2012, neutral): “tions (such as zero-forcing beamforming [11] and interference alignments [12]), the knowledge on full MIMO channel matrix H is needed at the transmitter.”
An overview of limited feedback in wireless communication systems (2008, background): “When the number of users increases, scheduling users with channels that satisfy near orthogonality conditions provi des many improvements [312], [313], [323], [350].”