The present invention provides a MIMO transmitter and a MIMO receiver, used in SC-FDMA system, which make interchanging for multiple paths of modulated symbol sequences in order to acquire diversity gain while ensure PAPR of single antenna. MIMO transmitter interchanges partial symbols of at least one error-correction codeword of at least one of the multipath modulated symbol sequences and partial symbols of at least one error-correction codeword of at least one of the other of the multipath modulated symbol sequences so as to obtain interchanged multipath modulated symbol sequences; MIMO receiver executes inverse-interchanging which is inverse to the interchanging in a MIMO transmitter for multipath interchanged signals received from multiple transmitting antennas. The present invention could reduce the BLER of the entire SC-FDMA system, and obtain diversity gain while ensure PAPR of single antenna.