An Efficient Joint Tx-Rx Beam Search Scheme in mmWave Massive MIMO Systems (Invited Paper)

This paper addresses the beam search complexity for massive multiple-input multiple-output (MIMO) in millimeter Wave (mmWave) band. In the mmWave massive MIMO systems, high-directional beams are used to against the severe path loss. However, it is faced with many challenges. One of them is that the beam search complexity and management overhead problems hinder the practical implement with a large number of antennas. To cope with the problem, an efficient joint transmit and receive (Tx-Rx) beam search scheme is proposed in this paper. In the initialization phase, the initial Tx-Rx beam pair is calculated by the coarse beam sweeping. Then, Rosenbrock algorithm is used to search the optimal beam pair in a two dimensional discrete space formed by the indexes of transmit beam and receive beam. In addition, double beam link is used to solve the link failure caused by channel block. Numerical simulation results are given to verify the effectiveness of the proposed scheme. Compared with the traditional beam search schemes, the proposed scheme can greatly reduce the search complexity and management overhead.