An apparatus, comprising: a plurality of antennas; a plurality of radios configured to perform wireless communication with one or more mobile devices; and one or more processing elements coupled to the plurality of radios; wherein the apparatus is configured to: receive an uplink pilot symbol from a mobile device over a first channel; receive uplink data from the mobile device over the first channel, wherein the uplink data is included in one or more orthogonal frequency division multiplexing (OFDM) symbols at a symbol rate; and characterized by the apparatus being further configured to: determine channel information based on the pilot symbol, using a plurality of processing elements each configured to operate on a different frequency portion of the pilot symbol in parallel; precode downlink data based on the channel information, using a plurality of processing elements each configured to precode a different frequency portion of the downlink data in parallel, and combine outputs of the plurality of processing elements to generate precoded downlink data; and transmit, via one or more of the plurality of antennas, the precoded downlink data to the mobile device; wherein a transition time interval between receiving the uplink pilot symbol and beginning to transmit the precoded downlink data corresponds to less than five OFDM symbols at the symbol rate. a plurality of antennas; a plurality of radios configured to perform wireless communication with one or more mobile devices; and one or more processing elements coupled to the plurality of radios; wherein the apparatus is configured to: receive an uplink pilot symbol from a mobile device over a first channel; receive uplink data from the mobile device over the first channel, wherein the uplink data is included in one or more orthogonal frequency division multiplexing (OFDM) symbols at a symbol rate; and characterized by the apparatus being further configured to: determine channel information based on the pilot symbol, using a plurality of processing elements each configured to operate on a different frequency portion of the pilot symbol in parallel; precode downlink data based on the channel information, using a plurality of processing elements each configured to precode a different frequency portion of the downlink data in parallel, and combine outputs of the plurality of processing elements to generate precoded downlink data; and transmit, via one or more of the plurality of antennas, the precoded downlink data to the mobile device; receive an uplink pilot symbol from a mobile device over a first channel; receive uplink data from the mobile device over the first channel, wherein the uplink data is included in one or more orthogonal frequency division multiplexing (OFDM) symbols at a symbol rate; and characterized by the apparatus being further configured to: determine channel information based on the pilot symbol, using a plurality of processing elements each configured to operate on a different frequency portion of the pilot symbol in parallel; precode downlink data based on the channel information, using a plurality of processing elements each configured to precode a different frequency portion of the downlink data in parallel, and combine outputs of the plurality of processing elements to generate precoded downlink data; and transmit, via one or more of the plurality of antennas, the precoded downlink data to the mobile device; determine channel information based on the pilot symbol, using a plurality of processing elements each configured to operate on a different frequency portion of the pilot symbol in parallel; precode downlink data based on the channel information, using a plurality of processing elements each configured to precode a different frequency portion of the downlink data in parallel, and combine outputs of the plurality of processing elements to generate precoded downlink data; and transmit, via one or more of the plurality of antennas, the precoded downlink data to the mobile device; wherein a transition time interval between receiving the uplink pilot symbol and beginning to transmit the precoded downlink data corresponds to less than five OFDM symbols at the symbol rate.