Techniques for spatially coupled multiple-input multiple-output signaling

An apparatus for wireless communications at a transmitting device, comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• encode, for transmission via a plurality of time-frequency resources and via a plurality of spatial layers, a plurality of code blocks associated with a codeword, wherein the plurality of code blocks are encoded into a first subset of code blocks that are each to be transmitted using fewer than all of the plurality of spatial layers and into a second subset of code blocks that are each to be transmitted using all spatial layers of the plurality of spatial layers, each code block of the second subset of code blocks and some of the first subset of code blocks being encoded for transmission in multiple code block portions, each of the multiple code block portions associated with a respective code block being encoded for transmission in different time-frequency resources of the plurality of time-frequency resources and across different spatial layers of the plurality of spatial layers;
• and
• transmit respective signals during corresponding time-frequency resources of the plurality of time-frequency resources, each of the respective signals including one or more code blocks from the first subset of code blocks, one or more code blocks from the second subset of code blocks, or combinations thereof.

A method for wireless communications at a receiving device, comprising:

• receiving, via a plurality of time-frequency resources using a plurality of spatial layers, a plurality of code blocks associated with a codeword, wherein the plurality of code blocks comprises a first subset of code blocks that are each received using fewer than all of the plurality of spatial layers and a second subset of code blocks that are each received using all spatial layers of the plurality of spatial layers, each code block of the second subset of code blocks and some of the first subset of code blocks being received in multiple code block portions, each of the multiple code block portions associated with a respective code block being received in different time-frequency resources of the plurality of time-frequency resources and across different spatial layers of the plurality of spatial layers;
• decoding a first code block of the first subset of code blocks based at least in part on the first code block being received using fewer than all of the plurality of spatial layers;
• and
• decoding, successively, additional code blocks of the first subset of code blocks or of the second subset of code blocks, or both, based at least in part on cancellation of at least one of the first code block or other previously decoded code blocks of the plurality of code blocks from a respective signal associated with a corresponding one of the additional code blocks and received during a corresponding time-frequency resource of the plurality of time-frequency resources.