Dmrs enhancement for higher order mu-mimo

An apparatus for wireless communications by an eNodeB, comprising:

• at least one processor configured to:
• determine a plurality of ports of a multi-dimensional array of transmit antennas and a number of spatial multiplexed layers for transmission to a plurality of user equipments (UEs);
• and
• configure a demodulation reference signal (DMRS) pattern by multiplexing the layers or the ports in the DMRS pattern, using an orthogonal cover code (OCC) and one or more code division multiplexing (CDM) groups;
• and
• a transceiver configured to:
• transmit DMRS symbols based on the configured DMRS pattern using the multiplexed layers and the ports.

A method for wireless communications by a user equipment (UE), comprising:

• receiving, from a base station (BS), a downlink (DL) control signaling indicative of a demodulation reference signal (DMRS) pattern;
• determining, based on the DL control signaling, ports of a multi-dimensional array of antennas and spatial multiplexed layers for DMRS symbols transmission, the ports and the layers being multiplexed in the orthogonal DMRS pattern using an orthogonal cover code (OCC) and one or more code division multiplexing (CDM) groups;
• and
• receiving the DMRS symbols based on the determination.

An apparatus for wireless communications by a user equipment (UE), comprising:

• a processor configured to:
• determine, based on DL control signaling, ports of a multi-dimensional array of antennas and spatial multiplexed layers for DMRS symbols transmission, the ports and the layers being multiplexed in the orthogonal DMRS pattern using an orthogonal cover code (OCC) and one or more code division multiplexing (CDM) groups;
• and
• a transceiver configured to:
• receive, from a base station, the downlink (DL) control signaling indicating a demodulation reference signal (DMRS) pattern, and
• receive the DMRS symbols based on the determination