Method and apparatus for determining pmi in wireless communication system

A receiving node in a wireless communication system, the receiving node comprising:

• memory, comprising one or more storage media, storing instructions;
• a transceiver;
• and
• at least one processor, comprising processing circuitry, communicatively coupled to the memory and the transceiver,
• wherein the instructions, when executed by the at least one processor individually or collectively, cause the receiving node to:
• receive at least one reference signal (RS) from a transmitting node,
• identify at least one matrix associated with a plurality of antennas, included in the receiving node or the transmitting node, for transmitting downlink data based on a channel frequency response (CFR), wherein the CFR is identified based on the at least one received RS,
• convert the identified at least one matrix into values associated with angles of beams formed by the plurality of antennas for transmitting the downlink data,
• determine at least one precoding matrix indicator (PMI) applicable to the plurality of antennas, based on the values associated with the angles of the beams, and
• identify, from the at least one PMI, a first PMI corresponding to a maximum downlink data throughput, and
• wherein each of the at least one PMI corresponds to at least one rank configured for multiple-input and multiple-output (MIMO).

One or more non-transitory computer-readable storage media storing one or more computer programs including computer-executable instruction that, when executed by one or more processors of a receiving node in a wireless communication system individually or collectively, cause the receiving node to perform operations, the operations comprising:

• receiving at least one reference signal (RS) from a transmitting node;
• identifying at least one matrix associated with a plurality of antennas, included in the receiving node or the transmitting node, for transmitting downlink data based on a channel frequency response (CFR), wherein the CFR is identified based on the received at least one RS;
• converting the identified at least one matrix into values associated with angles of beams formed by the plurality of antennas for transmitting the downlink data;
• determining at least one precoding matrix indicator (PMI) applicable to the plurality of antennas, based on the values associated with the angles of the beams;
• and
• identifying, from the at least one PMI, a first PMI corresponding to a maximum downlink data throughput,
• wherein each of the at least one PMI corresponds to at least one rank configured for multiple-input and multiple-output (MIMO).