Patent ID: 8531937

Claim:
A wireless communications method for a base station, the method comprising: transmitting a channel sounding response request (CSRq) in a downlink channel to a wireless transmit/receive unit (WTRU), wherein the CSRq comprises channel sounding instructions; receiving an uplink channel sounding response (CSR) responsive to the CSRq generated in accordance with the channel sounding instructions, the CSR is defined in terms of the number of symbols, size and symbol amplitude; determining a multiple-input multiple output (MIMO) uplink channel response via measuring the amplitude and phase of subcarriers of the CSR at a plurality of antennas; determining control information responsive to the MIMO uplink channel response, the control information including a plurality of sub-carriers to be transmitted on, and transmit parameter settings including modulation and coding parameters for each of the plurality of subcarriers to be transmitted on using at least one of a plurality of antennas; and transmitting the determined control information to the WTRU.