Judgment method and wireless communication apparatus

A radio communication device comprising:

• a radio communicator which executes a radio communication, using two or more directional beams selected from a plurality of directional beams;
• a determiner which determines which of line-of-sight waves and reflected waves is used for the executed radio communication, on the basis of an amount of variation in directions between the two or more directional beams used at different times;
• and
• a controller configured to control the radio unit to execute radio communication using the two or more directional beams selected based on a determination result indicating which of the line-of-sight waves and the reflected waves is used for radio communication, wherein,
• in a case where the two or more directional beams are formed using a digital precoder, the amount of variation is expressed using a correlation coefficient between weight coefficients,
• the determinator is configured to derive a propagation path vector to another radio communication device, using an arbitrary channel estimation method, and
• the controller is configured to multiply a transmission data to another radio communication device by a conjugate transposition vector of the propagation path vector as a weight vector of the weight coefficients.