Device and method of performing subcarrier grouping and/or codebook size selection in real-time for beamforming feedback and wireless communication system including the same

A beamformee device comprising:

• processing circuitry configured to,
• obtain channel information associated with a plurality of subcarriers based on a null data packet (NDP) received through a channel from a beamformer device,
• estimate an SNR of the channel,
• measure a variation on a frequency of the channel in real-time based on the channel information including calculating at least one of a variance of the frequency of the channel or a delay spread of the channel,
• select at least one threshold value based on the SNR,
• determine a grouping size value based on the at least one threshold value and the variation,
• select one or more first subcarriers among the plurality of subcarriers based on the grouping size value,
• select first channel information among the channel information based on the one or more first subcarriers,
• perform a singular value decomposition (SVD) on the first channel information,
• generate a beamforming feedback report by compressing a result of the SVD, and
• transmit the beamforming feedback report to the beamformer device.

A beamformee device comprising:

• processing circuitry configured to,
• obtain channel information associated with a plurality of subcarriers based on a null data packet (NDP) received through a channel from a beamformer device,
• measure a variation on a frequency of the channel based on the channel information,
• determine a codebook size value based on the variation,
• generate a beamforming feedback report based on the codebook size value and the channel information, and
• transmit the beamforming feedback report to the beamformer device.