| 摘要 |
PROBLEM TO BE SOLVED: To improve the carrier-to-interference ratio of a mobile communication network by detecting the position and direction of a mobile terminal against an antenna array, directing the main lobe of the antenna to the detected direction and performing downlink. SOLUTION: An antenna array comprises plural antennas 2 and plural antennas 2 which orthogonally cross them and are in the direction of polarized waves, a receiver 4 eliminates the differential phase of a receiving signal and after that, an A/D converter 6 stores it as a coded digital signal in a storage device 8. After a signal extracted from each device 8 is weighted by means of compound weight 12, a summing amplifier 16 adds them, cross correlation association is repeatedly performed based on a training sequence from the a mobile terminal 18, measurement reference to each direction is set by means of calculation and a direction which has the highest totaled direction measurement reference value is selected. This is repeatedly executed plural times, the antenna array is operated with the average value as a mobile terminal direction and the main lobe is formed in the direction. Thus, potential interference in the other directions is reduced.
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