Basis subset feedback for channel state information enhancement

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

• receiving a first encoded report and a second encoded report from a second device;
• decoding the first encoded report based at least in part on a first payload size to obtain first information for a plurality of basis vectors for a set of beams, wherein the first information indicates at least a number of beams in the set of beams with a non-zero number of basis vectors or a respective number of basis vectors for each beam in the set of beams;
• decoding the second encoded report based at least in part on a second payload size to obtain second information for the plurality of basis vectors, wherein the second payload size is determined based at least in part on the first information;
• and
• determining the plurality of basis vectors based at least in part on the first information and the second information, wherein the plurality of basis vectors is used for frequency domain compression for determining a set of non-zero precoding coefficients.

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

• one or more processors;
• one or more memories in electronic communication with the one or more processors;
• and
• instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
• determine a plurality of basis vectors for a set of beams, wherein the plurality of basis vectors is used for frequency domain compression for determining a set of non-zero precoding coefficients;
• encode first information for the plurality of basis vectors to obtain a first encoded report, wherein the first information comprises a first payload size and indicates at least a number of beams in the set of beams with a non-zero number of basis vectors or a respective number of basis vectors for each beam in the set of beams;
• encode second information for the plurality of basis vectors to obtain a second encoded report, wherein a second payload size for the second information is based at least in part on the first information;
• and
• transmit the first encoded report and the second encoded report to a second device.

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

• one or more processors;
• one or more memories in electronic communication with the one or more processors;
• and
• instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
• receive a first encoded report and a second encoded report from a second device;
• decode the first encoded report based at least in part on a first payload size to obtain first information for a plurality of basis vectors for a set of beams, wherein the first information indicates at least a number of beams in the set of beams with a non-zero number of basis vectors or a respective number of basis vectors for each beam in the set of beams;
• decode the second encoded report based at least in part on a second payload size to obtain second information for the plurality of basis vectors, wherein the second payload size is determined based at least in part on the first information;
• and
• determine the plurality of basis vectors based at least in part on the first information and the second information, wherein the plurality of basis vectors is used for frequency domain compression for determining a set of non-zero precoding coefficients.