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In this work, we consider the joint precoding across K transmitters (TXs),sharing the knowledge of the user's data symbols to be transmitted towards Ksingle-antenna receivers (RXs). We consider a distributed channel stateinformation (DCSI) configuration where each TX has its own local estimate ofthe overall multiuser MIMO channel. The focus of this work is on theoptimization of the allocation of the CSI feedback subject to a constraint onthe total sharing through the backhaul network. Building upon the Wyner model,we derive a new approach to allocate the CSI feedback while making efficientuse of the pathloss structure to reduce the amount of feedback necessary. Weshow that the proposed CSI allocation achieves good performance with only anumber of CSI bits per TX which does not scale with the number of cooperatingTXs, thus making the joint transmission from a large number of TXs morepractical than previously thought. Indeed, the proposed CSI allocation reducesthe cooperation to a local scale, which allows also for a reduced allocation ofthe user's data symbols. We further show that the approach can be extended to amore general class of channel: the exponentially decaying channels, which modelaccuratly the cooperation of TXs located on a one dimensional space. Finally,we verify by simulations that the proposed CSI allocation leads to very littleperformance losses.

Towards Optimal CSI Allocation in Multicell MIMO Channels