Channel state information reference signals in orthogonal time frequency space

An apparatus for wireless communication at a network node, comprising:

• one or more memories;
• and
• one or more processors configured to, based at least in part on information stored in the one or more memories:
• modulate, as a first portion of a wireless signal, data based at least in part on an orthogonal time frequency space (OTFS) modulation scheme, the wireless signal being based at least in part on a time-frequency domain resource block that is characterized by a frequency span and a time duration and comprising a plurality of time-frequency domain resource elements;
• modulate a second portion of the wireless signal based at least in part on a second modulation scheme, the second portion of the wireless signal including a channel state information reference signal (CSI-RS);
• and
• transmit the first portion of the wireless signal based at least in part on a first partition of the time-frequency domain resource block, and the second portion of the wireless signal based at least in part on a second partition of the time-frequency domain resource block, the first partition including a first set of resource elements of the plurality of time-frequency domain resource elements, and the second partition including a second set of resource elements of the plurality of time-frequency domain resource elements, wherein:
• at least one time-frequency domain resource element of the plurality of time-frequency domain resource elements is adjacent to a second time-frequency domain resource element of the plurality of time-frequency domain resource elements that includes at least some of the first portion of the wireless signal, or
• the one or more processors are further configured to, based at least in part on information stored in the one or more memories, puncture the data in a time-frequency domain with the CSI-RS.

A method for wireless communication at a mobile station, comprising:

• receiving, based at least in part on a time-frequency domain resource block that is characterized at least by a frequency span and a time duration and comprising a plurality of time-frequency domain resource elements, a wireless signal, wherein each time-frequency domain resource element of the plurality of time-frequency domain resource elements is characterized by a respective frequency span partition and a respective time duration partition, the wireless signal including:
• a first modulated portion located in a first partition of the time-frequency domain resource block, the first partition including a first set of resource elements of the plurality of time-frequency domain resource elements, and the first modulated portion being based at least in part on an orthogonal time frequency space (OTFS) modulation scheme, and
• a second modulated portion located in a second partition of the time-frequency domain resource block, the second partition including a second set of resource elements of the plurality of time-frequency domain resource elements, and the second modulated portion being based at least in part on a second modulation scheme;
• and
• recovering a channel state information reference signal (CSI-RS) from the second modulated portion based at least in part on at least one time-frequency domain resource element of the plurality of time-frequency domain resource elements, wherein:
• the at least one time-frequency domain resource element is adjacent to a second time-frequency domain resource element of the plurality of time-frequency domain resource elements that includes at least some of the first modulated portion of the wireless signal, or
• recovering the CSI-RS comprises recovering the CSI-RS as a puncture in set of time-frequency domain resource elements of the plurality of time-frequency domain resource elements that include at least some of the first modulated portion of the wireless signal.

A method for wireless communication at a network node, comprising:

• modulating, as a first portion of a wireless signal, data based at least in part on an orthogonal time frequency space (OTFS) modulation scheme, the wireless signal being based at least in part on a time-frequency domain resource block that is characterized by a frequency span and a time duration and comprising a plurality of time-frequency domain resource elements;
• modulating a second portion of the wireless signal based at least in part on a second modulation scheme, the second portion of the wireless signal including a channel state information reference signal (CSI-RS);
• and
• transmitting the first portion of the wireless signal based at least in part on a first partition of the time-frequency domain resource block, and the second portion of the wireless signal based at least in part on a second partition of the time-frequency domain resource block, the first partition including a first set of resource elements of the plurality of time-frequency domain resource elements, and the second partition including a second set of resource elements of the plurality of time-frequency domain resource elements, wherein:
• at least one time-frequency domain resource element of the plurality of time-frequency domain resource elements is adjacent to a second time-frequency domain resource element of the plurality of time-frequency domain resource elements that includes at least some of the first portion of the wireless signal, or
• the method further comprises puncturing the data in a time-frequency domain with the CSI-RS.