A method of wireless communication using frequency division multiplexing, comprising: a.) receiving , at a first wireless device, a reference signal from an access point indicating a set of wireless frequencies available for use by both the first wireless device and a second wireless device, the reference signal including an indication of a power level at which at least the first wireless device or the second wireless device should transmit; b.) transmitting , from the first wireless device to the access point, a first communication based on the reference signal, the first communication utilizing a first subset of the set of wireless frequencies available for use; wherein the first communication is transmitted at least partially concurrent with a second communication transmitted from the second wireless device to the access point, said second communication being transmitted on a second subset of the set of wireless frequencies available for use, the first and the second subsets being mutually exclusive subsets of the set of wireless frequencies available for use by both the first and second wireless devices, and both the first and second wireless devices being able to decode a packet on any of the first and second subsets of the set of wireless frequencies available for use; and c.) receiving, from the access point only on the first subset of wireless frequencies, a single broadcast acknowledgement carrying acknowledgement indications for both the first communication and the second communication. a.) receiving , at a first wireless device, a reference signal from an access point indicating a set of wireless frequencies available for use by both the first wireless device and a second wireless device, the reference signal including an indication of a power level at which at least the first wireless device or the second wireless device should transmit; b.) transmitting , from the first wireless device to the access point, a first communication based on the reference signal, the first communication utilizing a first subset of the set of wireless frequencies available for use; wherein the first communication is transmitted at least partially concurrent with a second communication transmitted from the second wireless device to the access point, said second communication being transmitted on a second subset of the set of wireless frequencies available for use, the first and the second subsets being mutually exclusive subsets of the set of wireless frequencies available for use by both the first and second wireless devices, and both the first and second wireless devices being able to decode a packet on any of the first and second subsets of the set of wireless frequencies available for use; and wherein the first communication is transmitted at least partially concurrent with a second communication transmitted from the second wireless device to the access point, said second communication being transmitted on a second subset of the set of wireless frequencies available for use, the first and the second subsets being mutually exclusive subsets of the set of wireless frequencies available for use by both the first and second wireless devices, and both the first and second wireless devices being able to decode a packet on any of the first and second subsets of the set of wireless frequencies available for use; and c.) receiving, from the access point only on the first subset of wireless frequencies, a single broadcast acknowledgement carrying acknowledgement indications for both the first communication and the second communication. <EOS>