A method for performing channel estimation, by a first terminal (110-1), in a wireless communication system, the method comprising: receiving demodulation-reference signals, DM-RSs, transmitted by a base station, BS, through a plurality of slots; and performing the channel estimation by using the DM-RSs, wherein a first slot of the plurality of slots includes two first DM-RSs, which are used for the first terminal (110-1) to measure a first channel between the first terminal (110-1) and the BS and for a second terminal (110-2) to measure a second channel between the second terminal (110-2) and the BS , wherein a second slot of the plurality of slots includes two second DM-RSs, which are used for the first terminal (110-1) to measure a third channel between the first terminal (110-1) and the BS and for the second terminal (110-2) to measure a fourth channel between the second terminal (110-2) and the BS , wherein a third slot of the plurality of slots includes four third DM-RSs, from which two DM-RSs are used for the first terminal (110-1) to measure a first product of the second channel and a fifth channel between the first terminal (110-1) and the BS and for the second terminal (110-2) to measure a second product of the second channel and a sixth channel between the second terminal (110-2) and the BS and from which the remaining two DM-RSs are used for the first terminal (110-1) to measure a third product of the third channel and the fifth channel and for the second terminal (110-2) to measure a fourth product of the third channel and the sixth channel, wherein the DM-RSs are transmitted from two transmission antennas of the BS and received by one reception antenna of the first terminal (110-1) and the second terminal (110-2). receiving demodulation-reference signals, DM-RSs, transmitted by a base station, BS, through a plurality of slots; and performing the channel estimation by using the DM-RSs, wherein a first slot of the plurality of slots includes two first DM-RSs, which are used for the first terminal (110-1) to measure a first channel between the first terminal (110-1) and the BS and for a second terminal (110-2) to measure a second channel between the second terminal (110-2) and the BS , wherein a second slot of the plurality of slots includes two second DM-RSs, which are used for the first terminal (110-1) to measure a third channel between the first terminal (110-1) and the BS and for the second terminal (110-2) to measure a fourth channel between the second terminal (110-2) and the BS , wherein a third slot of the plurality of slots includes four third DM-RSs, from which two DM-RSs are used for the first terminal (110-1) to measure a first product of the second channel and a fifth channel between the first terminal (110-1) and the BS and for the second terminal (110-2) to measure a second product of the second channel and a sixth channel between the second terminal (110-2) and the BS and from which the remaining two DM-RSs are used for the first terminal (110-1) to measure a third product of the third channel and the fifth channel and for the second terminal (110-2) to measure a fourth product of the third channel and the sixth channel, wherein the DM-RSs are transmitted from two transmission antennas of the BS and received by one reception antenna of the first terminal (110-1) and the second terminal (110-2). <EOS>