Joint time shift and spatial division algorithm to suppress massive MIMO pilot contamination

During the channel estimation process of Massive Multiple-Input Multiple-Output (MIMO) system, the same frequency sequence is required to reuse the same frequency sequence in different communities, so as to generate frequency pollution problems, and when antenna of base station is towards when it is endless, it has become a bottleneck for system performance improvement. In order to inhibit frequency pollution, a frequency sequence distribution of a combination of time movement and community space division, Time-Shifted-Cell Section Pilot Assignment method, this method is through time domain and spatial domain to angle of frequency reuse of the concept to inhibit frequency pollution. Direct the system to use the equivalent letter to dry ratio and the user's speed when using this scheme. The simulation analysis in proposed method can effectively inhibit frequency dirt of the massive MIMO system. Compared with several other inhibitory methods, it can achieve a certain improvement in system performance.