Method for indicating precoding vector, method for determining precoding vector, and communications apparatus

A communications apparatus, comprising at least one processor, and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:

• receiving, from a terminal apparatus, first indication information, wherein the first indication information indicates L1 space domain vectors in a space domain vector set, K1 frequency domain vectors in a frequency domain vector set, and T1 space-frequency component matrices, wherein a precoding vector of one or more frequency domain units is determined by a weighted sum of the T1 space-frequency component matrices, wherein the L1 space domain vectors and the K1 frequency domain vectors correspond to M1 space-frequency component matrices that comprise the T1 space-frequency component matrices, wherein each of the M1 space-frequency component matrices is determined by a different combination of one of the L1 space domain vectors and one of the K1 frequency domain vectors, and wherein M1=L1×K1, M1, L1, K1, and T1 are positive integers, and T1 is less than M1;
• and
• determining the precoding vector of the one or more frequency domain units based on the first indication information.

A non-transitory computer-readable storage medium storing programming instructions for being executed by at least one processor to perform operations comprising:

• receiving, from a terminal device, first indication information, wherein the first indication information indicates L1 space domain vectors in a space domain vector set, K1 frequency domain vectors in a frequency domain vector set, and T1 space-frequency component matrices, wherein a precoding vector of one or more frequency domain units is determined by a weighted sum of the T1 space-frequency component matrices, wherein the L1 space domain vectors and the K1 frequency domain vectors correspond to M1 space-frequency component matrices that comprise the T1 space-frequency component matrices, wherein each of the M1 space-frequency component matrices is determined by a different combination of one of the L1 space domain vectors and one of the K1 frequency domain vectors, and wherein M1=L1×K1, M1, L1, K1, and T1 are positive integers, and T1 is less than M1;
• and
• determining the precoding vector of the one or more frequency domain units based on the first indication information.