An apparatus and method are provided for transmitting a PUSCH and a DM RS associated with transmission of the PUSCH. The method includes receiving, by a UE, a DCI format including IEs over PDCCHs based on a UE ID, where the IEs include RA and RSC information indicating a combination of a CS and an OCC for the DM RS; identifying the CS and the OCC for the DM RS using the RSC information; acquiring a DM RS sequence based on the identified CS, the identified OCC, and a CAZAC-based sequence; mapping the DM RS sequence to sub-carriers, based on the RA; performing an IFT operation based on the DM RS sequence and the sub-carriers; generating a signal for transmitting on the PUSCH by adding a CP to a result of the IFT operation; and transmitting the signal on the PUSCH.