Joint power control, receiver beamforming and adaptive multi base station coordination for uplink wireless communications

We concentrate on the sum power minimization problem for the uplink of wireless cellular systems in this paper. Given a certain quality-of-service (QoS) constraint per mobile station (MS), the optimal power control and receiver beamforming are jointly considered with adaptive multi base station set (MBS) selection for joint reception. An iterative optimization algorithm is proposed accordingly. Although the problem is non-convex in general, it can always be optimally solved via the proposed algorithm as long as it is feasible. By changing the size of MBS, the system performance in terms of the transmit power over all MSs is evaluated through system level simulations. The results show that the transmit power can be significantly reduced even with a small size MBS, which is of a great interests for uplink communications.