MIMO detection method for multi-user interference suppression based on FRESH filter

The invention provides an MIMO (Multiple Input Multiple Output) detection method for performing multi-user interference suppression based on an FRESH filter, which comprises the following steps of: firstly, determining data signals with different code rates sent by different transmitting antennas in a 2 * 2 MIMO communication system, and obtaining cyclic frequencies and conjugate cyclic frequencies of the signals sent by the different transmitting antennas; then, generating a sending data sequence, carrying out LDPC coding, block interleaving, OQAM modulation, leader sequence adding and shaping filtering, and sending the sending data sequence through an antenna of a radio frequency part; and then, the two receiving antennas respectively carry out filtering equalization on the received signals through WL-MMSE, use a preamble for training an adaptive coefficient of WL-FRESH, filter useful signals through WL-FRESH, demodulate through a matched filter and sampling OQAM, de-interleave and de-LDPC to obtain an esti