FACILITATING CHANNEL SOUNDING FOR MULTIPLE INPUT AND MULTIPLE OUTPUT (MIMO) TRANSMISSIONS

摘要

Methods and apparatuses are provided for facilitating channel sounding for multiple-input and multiple-output (MIMO) transmissions between an access terminal and an access point. According to one feature, the access point may transmit a data frame to an access terminal using a plurality of spatial streams and a plurality of antennas. The access terminal may transmit an acknowledgement frame back to the access point, where the acknowledgement frame is transmitted as both a sounding signal and as to acknowledge receipt of the data frame. According to another feature, the access point may transmit a data frame and a matrix request frame to an access terminal. The access terminal may determine channel matrix information, and may send the channel matrix information together with an acknowledgement frame back to the access point.