The method includes: mapping determined transmission information and physical information about a downlink to N layers in a resource block (RB), so as to obtain N pieces of layer information, wherein N is a natural number greater than or equal to 1; modulating each of the N pieces of layer information to obtain N pieces of layer complex-value information; precoding each of the N pieces of layer complex-value information to obtain N pieces of RB antenna data, wherein the N pieces of RB antenna data are respectively mapped to N antenna ports; and sending the N pieces of RB antenna data.