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

Claim 0:
1. 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 a plurality of first orthogonal cover code values, map a DM-RS, associated with at least one antenna port of the first set, to first adjacent resource elements corresponding to two adjacent symbols in a time axis and corresponding to first two adjacent subcarriers in a frequency axis, wherein the plurality of first orthogonal cover code values comprise:
orthogonal cover code values associated with a first subcarrier of the first two adjacent subcarriers; and
orthogonal cover code values associated with a second subcarrier of the first two adjacent subcarriers;

for the second CDM group and based on a plurality of second orthogonal cover code values, map a DM-RS, associated with at least one antenna port of the second set, to second adjacent resource elements corresponding to the two adjacent symbols in the time axis and corresponding to second two adjacent subcarriers in the frequency axis, wherein the plurality of second orthogonal cover code values comprise:
orthogonal cover code values associated with a first subcarrier of the second two adjacent subcarriers; and
orthogonal cover code values associated with a second subcarrier of the second two adjacent subcarriers; and

for the third CDM group and based on a plurality of third orthogonal cover code values, map a DM-RS, associated with at least one antenna port of the third set, to third adjacent resource elements corresponding to the two adjacent symbols in the time axis and corresponding to third two adjacent subcarriers in the frequency axis, wherein the plurality of third orthogonal cover code values comprise:
orthogonal cover code values associated with a first subcarrier of the third two adjacent subcarriers; and
orthogonal cover code values associated with a second subcarrier of the third two adjacent subcarriers; and

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