Patent ID: 8040854

Claim:
A wireless communication system comprising: a plurality of wireless mobile stations, and a wireless base station for conducting wireless communication with the plurality of wireless mobile station by a TDD wireless communication method based on an orthogonal frequency division multiple access (OFDMA) scheme; wherein a data signal, a pilot signal and an individual control signal which are sent/received between the wireless base station and the plurality of wireless mobile stations, is assigned to each of the plurality of wireless mobile stations in units of subchannel which is made by further dividing subband zones as divisions of a predetermined communicable system band; wherein the wireless base station indicates a specific code for each wireless mobile station of the plurality wireless mobile stations, and instructs each said wireless mobile station to transmit the pilot signal and the individual control signal coded by the specific code in all of whole said subband zones; wherein each said wireless mobile station of the plurality of wireless mobile stations transmits the data signal using a preassigned subchannel and transmits the pilot signal and the individual control signal coded by the instruction of the wireless base station, in all of the whole subband zones; and wherein the wireless base station includes a plurality of antennas, receives coded multiplexed pilot signals which are sent from the plurality of wireless mobile stations, estimates a propagation path of the each subchannel from the individual pilot signal of the plurality of wireless mobile stations demultiplexed by the code, to obtain an estimation result, and using the estimation result, determines an array weight used for wireless signal transmission to the wireless mobile station.