Patent ID: 11916715
Assignee: INNOVATIVE TECHNOLOGY LAB CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. An apparatus comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the apparatus to:
determine a plurality of sets of antenna ports associated with demodulation reference signal (DM-RS) transmission, wherein a first code division multiplexing (CDM) group is associated with a first set of the plurality of sets of antenna ports, a second CDM group is associated with a second set of the plurality of sets of antenna ports, and a third CDM group is associated with a third set of the plurality of sets of antenna ports;
for the first CDM group and based on at least one first orthogonal cover code, map a first DM-RS, associated with at least one antenna port of the first set, to first four adjacent resource elements corresponding to two adjacent orthogonal frequency division multiplexing (OFDM) symbols in a time axis and corresponding to first two adjacent subcarriers in a frequency axis, wherein the at least one first orthogonal cover code is associated with the first two adjacent subcarriers;
for the second CDM group and based on at least one second orthogonal cover code, map a second DM-RS, associated with at least one antenna port of the second set, to second four adjacent resource elements corresponding to the two adjacent OFDM symbols in the time axis and corresponding to second two adjacent subcarriers in the frequency axis, wherein the at least one second orthogonal cover code is associated with the second two adjacent subcarriers; and
for the third CDM group and based on at least one third orthogonal cover code, map a third DM-RS, associated with at least one antenna port of the third set, to third four adjacent resource elements corresponding to the two adjacent OFDM symbols in the time axis and corresponding to third two adjacent subcarriers in the frequency axis, wherein the at least one third orthogonal cover code is associated with the third two adjacent subcarriers; and

a wireless transceiver to transmit:
the first DM-RS associated with at least one antenna port of the first set;
the second DM-RS associated with at least one antenna port of the second set; and
the third DM-RS associated with at least one antenna port of the third set.