Adaptive feedback scheme on multicell multiuser MISO system

Multicell base station cooperation can improve sum-rates and reduce outage in cellular system by sharing user channel state information (CSI). On the basis of inter-cell interference nulling (ICES) at the transmitter sides of cooperative base stations, we propose an adaptive feedback bit allocation scheme to minimize the rate loss due to limited feedback. Furthermore, we investigate the scaling law of the total number of bits per user to maintain a constant rate loss. Simulation results show that the proposed feedback bits allocation strategy provides significant gain compared to equal bits allocation.