A method comprising: a) transmitting a sounding announcement frame by a transmitting device to a receiving device in an orthogonal frequency division multiple access, OFDMA, wireless system; b) transmitting a sounding signal over a wide channel, wherein the sounding signal is transmitted over multiple sub-channels of the wide channel; said method being characterized by: c) providing a feedback mode indication and a feedback type indication to the receiving device, wherein the feedback mode indication comprises a feedback mode element to indicate a specific feedback mode from one or more feedback modes for the receiving device to provide associated feedback information; and d) receiving the associated feedback information from the receiving device, wherein the feedback information contains estimated channel quality information of a selected set of sub-channels based on the feedback mode indication, wherein the one or more feedback mode comprises one or more or all of the following feedback modes: - a feedback mode in which a sub-channel signal-to-noise ratio, SNR, and a beamforming matrix for a set of sub-channels is the associated feedback information; - a feedback mode in which a sub-channel SNR for a set of sub-channels is the associated feedback information; - a feedback mode in which an average SNR or minimum SNR for a set of sub-channels is the associated feedback information; - a feedback mode in which an average SNR or minimum SNR for a predefined set of sub-channels and an identification of the predefined set of sub-channels is the associated feedback information, - a feedback mode in which an identification of a predefined sub-channel set and the SNR for each sub-channel in the predefined sub-channel set is the associated feedback information, and - a feedback mode in which an identification of a predefined sub-channel set, the SNR and the beamforming matrix for each sub-channel in the predefined sub-channel set is the associated feedback information. a) transmitting a sounding announcement frame by a transmitting device to a receiving device in an orthogonal frequency division multiple access, OFDMA, wireless system; b) transmitting a sounding signal over a wide channel, wherein the sounding signal is transmitted over multiple sub-channels of the wide channel; c) providing a feedback mode indication and a feedback type indication to the receiving device, wherein the feedback mode indication comprises a feedback mode element to indicate a specific feedback mode from one or more feedback modes for the receiving device to provide associated feedback information; and d) receiving the associated feedback information from the receiving device, wherein the feedback information contains estimated channel quality information of a selected set of sub-channels based on the feedback mode indication, - a feedback mode in which a sub-channel signal-to-noise ratio, SNR, and a beamforming matrix for a set of sub-channels is the associated feedback information; - a feedback mode in which a sub-channel SNR for a set of sub-channels is the associated feedback information; - a feedback mode in which an average SNR or minimum SNR for a set of sub-channels is the associated feedback information; - a feedback mode in which an average SNR or minimum SNR for a predefined set of sub-channels and an identification of the predefined set of sub-channels is the associated feedback information, - a feedback mode in which an identification of a predefined sub-channel set and the SNR for each sub-channel in the predefined sub-channel set is the associated feedback information, and - a feedback mode in which an identification of a predefined sub-channel set, the SNR and the beamforming matrix for each sub-channel in the predefined sub-channel set is the associated feedback information.