Pilot frequency distribution method for multi-cell multi-user large-scale MIMO system

The invention discloses a pilot frequency distribution method for a multi-cell multi-user large-scale MIMO system. According to a large-scale fading factor, users of all cells are classified into a center user group and an edge user group; secondary screening is carried out on users in the edge user group; because large-scale fading factors between the users in the center user group and base stations of cells are small and spatial distances between the center user groups of the adjacent cells are long, users in the center user group of all cells reuse a pilot frequency sequence set; and because large-scale fading factors between the users in the edge user group and base stations of the cells are large and spatial distances between the edge user groups of the adjacent cells are short, pilot frequency sequences orthogonal to each other are distributed to the edge user groups of different cells. The method disclosed by the invention has the following characteristics: the requirement on the pilot frequency sequen