  This paper proposes a beamforming method under a per-antenna power constraint
(PAPC). Although many beamformer designs with the PAPC need to solve complex
optimization problems, the proposed complete power reallocation (CPR) method
can generate beamformers with excellent performance only with linear
operations. CPR is designed to have a simple structure, making it highly
flexible and practical. In this paper, three CPR variations considering
algorithm convergence speed, sum-rate maximization, and robustness to channel
uncertainty are developed. Simulation results verify that CPR and its
variations satisfy their design criteria, and, hence, CPR can be readily
utilized for various purposes.
