Channel Estimation Based on Orthogonal Factor Tensor Decomposition for 3D MIMO Systems

3D MIMO technology can increase the degree of freedom of the system by providing multiple antennas in the vertical direction, which can better meet the rapidly growing traffic demand in 5G transmission, and has become an important issue in wireless communication. In this paper, the concept of tensor is introduced in 3D MIMO system, and the method of tensor decomposition is used in channel estimation. At the same time, the orthogonal constraints are added to the pilot signals, and the tensor decomposition technology with orthogonal factors is solved by the least alternating square method which can obtain the angle parameters of the 3D MIMO system. The simulation results show that the channel estimation results are more accurate.