1. A method of transmitting an uplink signal by a user equipment (UE) to a base station (BS) in a wireless communication system, the method comprising:receiving, from the BS, first downlink control information (DCI) including information about resource blocks allocated in a wideband (WB) and second DCI including information about precoders indicated in units of a subband (SB);
configuring the allocated resource blocks as SBs including two or more contiguous resource blocks; and
transmitting, to the BS, the uplink signal through the SBs, by applying the precoders to corresponding SBs,
wherein a WB modulation and coding scheme (MCS) and a WB precoding matrix indicator (PMI) are included in the first DCI, and a SB MCS and SB PMIs are included in the second DCI,
wherein, based on the UE being configured to use the SB PMI for the transmission of the uplink signal and succeeding in the reception of the second DCI, the SB MCS and a corresponding SB PMI included in the second DCI are used for the transmission of the uplink signal,
wherein, based on the UE being configured to use the SB PMI for the transmission of the uplink signal and failing in the reception of the second DCI, the WB MCS and the WB PMI included in the first DCI are used for the transmission of the uplink signal, and
wherein the first and the second DCI are received through a same subframe and are configured based on a same aggregation level.