Multi-antenna system using adaptive beamforming

A multi-antenna system using adaptive beamforming, comprising:

• a phase shift unit comprising a plurality of phase shifters which shift the phases of signals received from a plurality of antennas, each of the phase shifters shifting the phase of the corresponding received signal, depending on a preset weight vector;
• a signal combination unit combining phase-shifted signals output from the plurality of phase shifters;
• a frequency down-converter down-converting a signal output from the signal combination unit into a baseband signal;
• an analog-to-digital (A/D) converter converting the baseband signal output from the frequency down-converter into a digital signal;
• and
• a beamforming control unit searching for a weight vector higher than a preset threshold signal-to-noise ratio (SNR) among a plurality of prepared weight vectors when a reception SNR of the digital signal output from the A/D converter is lower than the threshold SNR, and changing a currently set weight vector into the searched weight vector to provide to the phase shift unit.