1. A station (STA) for transmitting in a wireless local area network (WLAN), the STA comprising:a controller; and
a transceiver configured to:
receive, from an access point (AP), a channel sounding sequence including a null data packet announcement frame (NDPA) including information indicating STAs to transmit a feedback report and information indicating that the feedback report should include an index of a selected resource unit and a signal to noise ratio (SNR) value averaged over data subcarriers in the selected resource unit for each spatial stream, a null data packet (NDP) containing pilots to compute the feedback report, and a trigger frame (TF) to trigger transmission of the feedback report; and
transmit the feedback report to the AP in response to receipt of the TF.