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L. Thiele, M. Kurras, S. Jaeckel, S. Fähse, W. Zirwas.  2015.  "Interference-floor shaping for liquid coverage zones in coordinated 5G networks". 2015 49th Asilomar Conference on Signals, Systems and Computers. :1102-1106.

Joint transmission coordinated multi-point (CoMP) is a combination of constructive and destructive superposition of several to potentially many signal components, with the goal to maximize the desired receive-signal and at the same time to minimize mutual interference. Especially the destructive superposition requires accurate alignment of phases and amplitudes. Therefore, a 5G clean slate approach needs to incorporate the following enablers to overcome the challenging limitation for JT CoMP: accurate channel estimation of all relevant channel components, channel prediction for time-aligned precoder design, proper setup of cooperation areas corresponding to user grouping and to limit feedback overhead especially in FDD as well as treatment of out-of-cluster interference (interference floor shaping).