Multi-user detection method and device for OFDM signal

The invention discloses a multi-user detection method of orthogonal frequency division multiplexing transmission signals and a device thereof. The method comprises: the receiving signals of the time-frequency symbol positions in a plurality of repeating unit blocks corresponding to the same data signal are taken as a receiving data sequence; a combination repeating channel response sequence array which is corresponding to the receiving data sequence is determined; and the combination repeating channel response sequence array is used for detecting and processing the receiving data sequence, so as to obtain the multi-user data symbol information. The technical proposal effectively inhibits the multiple access interference and the intersymbol interference in the OFDM transmission signal process and greatly improves the system performance.