User-aided sub-clustering for CoMP transmission: Feedback overhead vs. data rate trade-off
The need for cell densification leads to inter-cell interference mitigation techniques known as coordinated multi-point (CoMP) transmission and reception. This work focuses on the Long Term Evolution - Advanced (LTE-A) frequency division duplex (FDD) downlink. In order to group active users for clustered zero-forcing (ZF) beamforming, we will introduce a greedy user scheduling method using a projection-based rate approximation metric. The clusters are defined in a network-centric fashion, where users are allowed to provide channel feedback for the whole cluster or a sub-set only.