Method and apparatus for receiving or transmitting downlink signal in a wireless communication system

A mobile terminal for receiving a downlink signal according to a Demodulation Reference Signal (DMRS)-based transmission scheme in a wireless communication system, the mobile terminal comprising:

• a transmitter and a receiver;
• and
• a processor configured to control the transmitter and the receiver,
• wherein the processor is further configured to:
• receive indication information indicating that timewise Resource Element (RE) pairing is allowed for first REs,
• receive allocation order information,
• wherein the allocation order information includes an allocation order of data between the first REs and second REs when the time-wise RE pairing is allowed;
• and
• decode the data based on the indication information and the allocation order information,
• wherein the first REs are REs that do not constitute frequency-wise RE pairs for space frequency block coding (SFBC) in physical downlink shared channel (PDSCH) orthogonal frequency division multiplexing (OFDM) symbols to which the DMRSs are mapped,
• wherein the second REs are REs that constitute frequency-wise RE pairs for the SFBC in the PDSCH OFDM symbols to which the DMRSs are mapped, and
• wherein the data is allocated to the first REs in one or more pairs of two OFDM symbols by a subcarrier in a time domain, and then allocated to the second REs in one ore more frequency-wise RE pairs with increasing order of a frequency domain index.