Method and apparatus for transmitting a reference signal in a multi-antenna system

A user equipment (UE) in a wireless communication system, the UE comprising:

• a memory;
• a transceiver;
• and
• a processor, operably coupled to the memory and the transceiver, that:
• controls the transceiver to receive, from a base station, a cyclic shift field in downlink control information (DCI), wherein the cyclic shift field indicates first, second, and third cyclic shift values for first, second, and third layers respectively, by table below:
• First cyclic
• Second cyclic
• Third cyclic
• shift value for
• shift value
• shift value
• Cyclic shift field
• first layer
• for second layer
• for third layer
• 000
• 0
• 6
• 3
• 001
• 6
• 0
• 9
• 010
• 3
• 9
• 6
• 011
• 4
• 10
• 7
• 100
• 2
• 8
• 5
• 101
• 8
• 2
• 11
• 110
• 10
• 4
• 1
• 111
• 9
• 3
• 0
• generates first, second, and third demodulation reference signals (DMRSs) for the first, second, and third layers respectively, based on first, second, and third cyclic shifts respectively, wherein the first, second, and third cyclic shifts are determined based on the first, second, and third cyclic shift values respectively, and
• controls the transceiver to transmit, to the base station, the first, second, and third DMRSs.