RADIO COMMUNICATION SYSTEM, TRANSMISSION STATION AND ROTATION ANGLE CONTROLLER

摘要

PROBLEM TO BE SOLVED: To adjust correlation between transmission antennas in the same transmission station and to adjust a reception power difference between the transmission stations in a reception station in a radio communication system for performing MIMO transmission for which the plurality of transmission stations are linked.

SOLUTION: A base station controller 40 supplies transmission data in common to base stations 10 and 20. The base stations 10 and 20 calculate the spread multiplex signals for the total number of the transmission antennas of the base stations 10 and 20 by spread-multiplexing the transmission data by a rotation orthogonal code having a first rotation angle θ2for adjusting the correlation between the transmission antennas in the same transmission station and a second rotation angle θ4for adjusting the reception power difference between the transmission stations in the reception station as adjustment parameters, divide the spread multiplex signals for the present station to the respective transmission antennas and transmit them simultaneously by the same frequency.

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