Pilot frequency pollution reduction method based on partial pilot frequency multiplexing in large-scale MIMO system

The invention discloses a pilot frequency pollution reduction method based on partial pilot frequency multiplexing in a large-scale MIMO system, and belongs to the field of communications. The pilot frequency pollution reduction method comprises the following steps: first, dividing pilot frequency sequences allocated to cell users into a multiplexing pilot frequency sequence group and an orthogonal pilot frequency sequence; second, dividing the users in the cell into pilot frequency multiplexing users and orthogonal pilot frequency users according to numerical value features from the users to a large-scale fading coefficient of a target base station channel, randomly allocating the pilot frequency of the multiplexing pilot frequency sequence group to the pilot frequency multiplexing users, wherein the group of pilot frequency sequences is multiplexed in other cells, and allocating the pilot frequency of the orthogonal pilot frequency sequence to the orthogonal pilot frequency users, wherein the group of pilot frequency sequences is not multiplexed in other cells; and third, processing and receiving the uplink data of the users at a base station end, maximizing the total spectral efficiency of an uplink target cell to figure out an optimal partial pilot frequency multiplexing factor, and realizing optimized configuration of the pilot frequency based on this, so as to obviously reduce the pilot frequency pollution.