Wireless communication apparatus and beam control method

A beam control method for a wireless communication apparatus having computer, and a plurality of antenna elements configured to output a first beam and a second beam, based on a weighting vector representing weighting with respect to at least one of a gain and a phase, the beam forming method comprising:

• deriving, by the computer, a weighting vector corresponding to a maximum eigen value of a matrix obtained by subtracting, from a first matrix representing an output power of a main lobe of the first beam, a matrix obtained by multiplying a second matrix representing an output power of a side lobe of the first beam to a reduction ratio for reducing the output power of the side lobe of the first beam interfering with a main lobe of the second beam;
• determining, by the computer, whether or not a power ratio of the output power of the main lobe of the first beam, obtained by multiplying the weighting vector and a complex conjugate transpose of the weighting vector to the first matrix, with respect to the output power of the side lobe of the first beam, obtained by multiplying the weighting vector and the complex conjugate transpose of the weighting vector to the second matrix, is greater than a maximum Signal-to-Interference Ratio (SIR) SIRmax;
• and
• extracting, by the computer, the weighting vector when determining determines that the power ratio is not larger than the maximum SIRmax.