Patent ID: 8401133
Filing Date: 2013-03-19
Classification: H04B

Abstract:
1. A multi-antenna system, comprising: a phase shift unit including a plurality of phase shifters configured to shift phases of signals received from a plurality of antennas, respectively, based on a preset weight vector; a signal combination unit coupled to the phase shifters and configured to receive phase-shifted signals from the phase shifters to combine the phase-shifted signals; a frequency down-converter configured to down-convert a signal output from the signal combination unit into a baseband signal; an analog-to-digital (A/D) converter configured to convert the baseband signal output from the frequency down-converter into a digital signal; and a beamforming control unit coupled to the A/D converter and configured to receive the digital signal to change the preset weight vector currently set in the phase shift unit based on a reception signal-to-noise ratio (SNR) of the digital signal, wherein the beamforming control unit comprises: a codebook comprising a plurality of preset weight vectors which are preset for beamforming of the antennas; an SNR measurement unit coupled to the A/D converter and configured to measure the reception SNR of the digital signal; an SNR comparison unit coupled to the SNR measurement unit and configured to compare the reception SNR from the SNR measurement unit with a preset threshold SNR; and a weight vector control unit coupled to the phase shifter unit and configured to