Wireless communication system and method using multiple antennas

A mobile station that receives a user signal including multi-user signals from a base station, the mobile station comprising:

• a signal reception unit that processes the user signal;
• and
• a feedback signal generation unit that estimates channel characteristics, over which the multi-user signals have been transmitted, from the multi-user signals, classifies a plurality of weight vectors to be applied to the estimated channel characteristics into a plurality of sets, selects a set maximizing a transmission capacity from among the classified sets, and feeds back indexes of weight vectors included in the selected set and weighted channel information obtained from weighted channel characteristics corresponding to the selected set to the base station.

A base station that processes a user signal based on mobile station index information for channel selection and Signal Interference to Noise Ratio (SINR) information of selected channels, information being fed back from a plurality of mobile stations, and transmits the processed access signal through a plurality of antennas, the base station comprising:

• a feedback signal processing unit that classifies indexes and SINRs, which are received from the plurality of mobile stations, for each of the mobile stations, reclassifies the classified SINRs by the weight indexes, selects a peak SINR from among the classified SINRs, classifies weight vectors corresponding to the weight indexes into a plurality of sets, selects a set giving a peak transmission capacity from among the sets, outputs mobile station indexes and predetermined types of information measured from the peak SINR that correspond to the selected set;
• and
• a signal transmission unit that selects channels, over which the user signals are to be transmitted, using the predetermined types of information output from the feedback signal processing unit, modulates and codes the user signals, processes the user signals by applying weight vectors corresponding to the respective selected channels to the user signal, and transmits the processed user signals through the plurality of antennas.