Hybrid closed-loop multiple-input multiple-output and transparent diversity schemes

An apparatus for wireless communications, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a network device, an indication that the apparatus is to use a closed-loop multiple-input multiple-output (MIMO) scheme for transmissions of uplink data using a plurality of antenna ports that include a plurality of groups of antenna ports, antenna ports within each group of antenna ports being phase coherent with each other antenna port belonging to a corresponding group of antenna ports and being phase incoherent with the antenna ports belonging to at least one other group of antenna ports;
• generate, from the uplink data, a plurality of output signals corresponding to the plurality of antenna ports based at least in part on applying the closed-loop MIMO scheme for the plurality of groups of antenna ports;
• and
• transmit the plurality of output signals using the plurality of antenna ports.

An apparatus for wireless communication, comprising:

• means for receiving, from a network device, an indication that the apparatus is to use a closed-loop multiple-input multiple-output (MIMO) scheme for transmissions of uplink data using a plurality of antenna ports that include a plurality of groups of antenna ports, antenna ports within each group of antenna ports being phase coherent with each other antenna port belonging to a corresponding group of antenna ports and being phase incoherent with the antenna ports belonging to at least one other group of antenna ports;
• means for generating, from the uplink data, a plurality of output signals corresponding to the plurality of antenna ports based at least in part on applying the closed-loop MIMO scheme for the plurality of groups of antenna ports;
• and
• means for transmitting the plurality of output signals using the plurality of antenna ports.

A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:

• receive, from a network device, an indication that the UE is to use a closed-loop multiple-input multiple-output (MIMO) scheme for transmissions of uplink data using a plurality of antenna ports that include a plurality of groups of antenna ports, antenna ports within each group of antenna ports being phase coherent with each other antenna port belonging to a corresponding group of antenna ports and being phase incoherent with the antenna ports belonging to at least one other group of antenna ports;
• generate, from the uplink data, a plurality of output signals corresponding to the plurality of antenna ports based at least in part on applying the closed-loop MIMO scheme for the plurality of groups of antenna ports;
• and
• transmit the plurality of output signals using the plurality of antenna ports.