Dual-polarized spatial division multiple access transmission for 3D multiuser massive MIMO

The paper proposes a spatial division multiple access (SDMA) multiuser transmission scheme for massive multiple input multiple output (MIMO) systems working in the 3D scenery where the BS is deployed with dual-polarized (DP) uniform linear arrays(ULA). Considering the physical features for dual-polarized arrays, we obtain the DP antenna beamspace channels by designating the beam transformation matrix, which can ensure the channel transmission correlation matrix is a diagonal matrix, and that the DP beamspace channels are orthogonal between each beam direction. Based on the maximum sum-rate principle and the orthogonality of the beam channels, the users in a cell are scheduled by greedy algorithm. The base station communicates with the scheduled users with orthogonal beams. Thus, the multiuser multiple input multiple output links turn into single user MIMO link. Simulation results demonstrate that the system throughput has been greatly improved compared with that under single polarized environment.