Apparatus and method for enhancing features of uplink reference signals

A user equipment (UE) for transmitting a physical uplink shared channel (PUSCH) and a demodulation (DM) reference signal (RS) associated with transmission of the PUSCH in a communication system, the UE comprising:

• a receiver configured to receive downlink control information (DCI) including a plurality of information elements (IEs) over a physical downlink control channel (PDCCH) based on a UE identifier (ID) corresponding to the UE, where the plurality of IEs include a resource allocation (RA) and information indicating a combination of a cyclic shift (CS) for the DM RS and an orthogonal cover code (OCC), and identify the CS for the DM RS and the OCC using the information indicating the combination of the CS for the DM RS and the OCC;
• and
• a controller configured to acquire a DM RS sequence based on the identified CS, the identified OCC, and a constant amplitude zero auto-correlation (CAZAC)-based sequence, controlling an inverse fourier transform (IFT) operation performed based on the DM RS sequence and the RA to generate the DMRS, and control a transmitter configured to transmit the DMRS associated with the PUSCH.

A base station (BS) for assigning, to a user equipment (UE), a demodulation (DM) reference signal (RS) associated with a physical uplink shared channel (PUSCH) in a communication system, the BS comprising:

• a controller configured to allocate a resource, a cyclic shift (CS) for the DM RS and an Orthogonal Cover Code (OCC) for the UE, configure downlink control information (DCI) including a plurality of information elements (IEs) for the UE, where the plurality of IEs include a resource allocation (RA) indicating the resource and information indicating a combination of the CS for the DM RS and the OCC, and control a transmitter configured to transmit the DCI including the plurality of IEs over physical downlink control channels (PDCCHs), based on a UE identifier (ID) corresponding to the UE;
• and
• a receiver configured to receive, from the UE, the DM RS associated with the PUSCH, based on the DCI.