An efficient method for opportunistic beamforming with one bit feedback

It is recently shown that the opportunistic beamforming through multiple orthonormal random beamformers (ORBF), results in the optimal scaling law of sum-capacity in a multi-antenna broadcast channel when the number of system users tends to infinity. In this paper we propose a new and efficient method for decreasing the feedback amount required in the ORBF method. In our method, the required feedback reduces to 1 bit per user by partitioning the users in the system and using an optimal predetermined threshold. We evaluate a lower bound of the average sum-rate throughput of the proposed method. Our computer simulations show that the proposed scheme outperforms the proposed method in [6] which requires the same amount of feedback.