User-specific coordination of limited feedback with power allocation in multi-point system

Coordinated multi-point transmission with limited rate feedback has been paid much attention recently due to its ability to overcome the detrimental propagation conditions. In the limited feedback multi-point transmission, how to allocate the appropriate feedback bits among the users has become a critical issue to be investigated. The existing schemes have not considered the impact of the flexible power allocation on the feedback bit allocation among the users. The main contribution of this paper is to propose a user-specific coordination scheme to dynamically coordinate the feedback bit number for each user according to the overall result of power allocation in the limited feedback multi-point transmission. We also develop an iteration algorithm to efficiently achieve the satisfactory solution of our proposed issue. Simulation results will show the advantages of our proposed scheme.