The invention discloses a technology for realizing signal transmission in a narrowband wireless communication system. Firstly, a base station repeatedly places business data on N continuous and available downlink subframes and informs to a terminal, and the terminal receives NPSS/NSSS/NPBCH subframes on an anchor carrier and carries out frequency offset estimation accordingly. After the terminal receives the downlink subframes, the terminal carries out frequency offset correction on receiving data according to an estimated frequency offset value, and lastly, the terminal merges the subframe data after frequency offset correction and a channel estimation result thereof and carries out MIMO detection at a time. The invention aims at improving the noise reduction capability in the narrowband wireless communication while reducing the implementation complexity of the terminal.