Patent ID: 8121019
Filing Date: 2012-02-21
Classification: H04B

Abstract:
1. A wireless communication apparatus which has a plurality of antennas, and which switches between first multi-antenna transmission control that performs multi-stream transmission and second multi-antenna transmission control that performs single-stream transmission, comprising: a first transmission portion configured to perform multiple-input multiple-output (MIMO) transmission control as the first multi-antenna transmission control; a second transmission portion configured to perform second multi-antenna transmission control; a control portion configured to control such that, when a distance to a communication partner apparatus is smaller than a preset distance, MIMO transmission is performed as the first multi-antenna transmission control, and when the distance is greater than the preset distance, the second multi-antenna transmission is performed; and a storage portion configured to store building data that specify positions of buildings and three-dimensional shapes of the buildings, wherein the control portion makes reference to the building data and judges whether a building, which blocks communication with the communication partner apparatus, exists on a straight line connecting the wireless communication apparatus and the communication partner apparatus, and if the building exists, executes control such that MIMO transmission is performed even when the distance to the communication partner apparatus is greater than the preset distance.