Formula-based inter-circle precoding weight determination for orbital angular momentum (OAM) communication systems

An apparatus configured for wireless communication, comprising:

• a processor;
• a plurality of antenna elements, comprising a first subset of antenna elements that includes at least a first antenna element and a second antenna element, and a second subset of antenna elements that includes at least a third antenna element and a fourth antenna element;
• and
• a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the processor to:
• receive, from a transmitting apparatus comprising a third subset of antenna elements and a fourth subset of antenna elements, an indication that the third subset of antenna elements are to be used to transmit a first reference signal for a first orbital angular momentum (OAM) mode;
• receive, from the transmitting apparatus, an indication that the fourth subset of antenna elements are to be used to transmit a second reference signal for the first OAM mode;
• and
• transmit information indicative of a subset of antenna elements of the plurality of antenna elements that was used to receive the first reference signal.

A method for wireless communication, comprising:

• transmitting, via a first subset of antenna elements of a plurality of antenna elements, a first reference signal using a first orbital angular momentum (OAM) mode;
• transmitting, via a second subset of antenna elements of a plurality of antenna elements, a second reference signal using the first OAM mode;
• and
• receiving information indicative of a subset of antenna elements of the plurality of antenna elements to use to transmit the first OAM mode.

A method for wireless communication, comprising:

• receiving, at a receiving apparatus comprising a plurality of antenna elements including a first subset of antenna elements and a second subset of antenna elements and from a transmitting apparatus comprising a third subset of antenna elements and a fourth subset of antenna elements, an indication that the third subset of antenna elements are to be used to transmit a first reference signal for a first orbital angular momentum (OAM) mode;
• receiving, from the transmitting apparatus, an indication that the fourth subset of antenna elements are to be used to transmit a second reference signal for the first OAM mode;
• and
• transmitting information indicative of a subset of antenna elements of the plurality of antenna elements that was used to receive the first reference signal.