Antenna selection for mobile stations in OFDMA networks

A system for selecting antennas in an orthogonal frequency division multiple access (OFDMA) network, in which the network includes a base station and a plurality of mobile stations, in which the base station and the plurality of mobile stations communicate with each other using frames, comprising:

• a base station configured to transmit a down-link (DL) subframe of a frame to a mobile station in an OFDMA network, in which the mobile station includes a plurality of antennas, and in which the DL subframe allocates one or more symbols and one or more subcarriers of an up-link (UL) subframe of the frame for antenna selection signals, and in which the base station further comprises:
• means for selecting a subset of the plurality of antennas in the base station based on the antenna selection signals transmitted in the UL subframe by the mobile station at the allocated subcarriers and symbols, wherein the antenna selection signals are transmitted by the mobile station using different subsets of the plurality of antennas, and wherein the mobile station switches between the different subsets of antennas during a cyclic prefix period of each symbol of the UL subframe.