Patent ID: 8848639

Claim:
An access point (AP) comprising: a communication interface configured to: transmit at least one first signal including a plurality of sounding symbols to a plurality of wireless stations (STAs), wherein the plurality of sounding symbols indicate a subset of sub-channels within at least one channel being sounded; and receive at least one second signal from at least one of the plurality of STAs via one or more sub-channels of the subset of sub-channels; a processor configured to: generate the plurality of sounding symbols; adaptively determine at least one sub-channel from the one or more sub-channels of the subset of sub-channels within the at least one channel for use in at least one subsequent communication with the at least one of the plurality of STAs, wherein receipt of the at least one second signal via the at least one second signal indirectly or implicitly indicates the one or more sub-channels of the subset of sub-channels within the at least one channel being preferred by the at least one of the plurality of STAs over another one or more sub-channels of the subset of sub-channels within the at least one channel not used for receipt of the at least one second signal.