There is disclosed a radio communication
system in which a constitution of a
base station and further a control
station can be simplified. A radio communication
system according to the present invention converts a received
signal received by a plurality of antenna elements in a
base station to a
signal of different
frequency band, and then conflates the converted
signal in order to generate sub-carrier wavemultiplex signal. The signal is converted to an optical signal, and then the optical signal is transmitted to a control
station via an
optical fiber. Or the control
station performs weighting to phase of the transmitted signal transmitted from a plurality of antennas of a
base station, and then performs
frequency conversion to different
frequency band, and then conflates the converted signal in order to generate the sub-carrier wave
multiplex signal. The signal is converted to an optical signal, and then an optical signal is transmitted to the base station side via the
optical fiber. The control station and the base station divides the received sub-carrier wave
multiplex signal by each
frequency band, and then the frequency of the divided signals are converted to the same frequency band in order to generate the transmitted / received signal of each
antenna element. By such a constitution, it is possible to reduce constituent of the optical transmission components to the minimum and to simplify the constitution of the base station. Furthermore, it is possible to maintain the
relative phase difference and the
relative intensity of the transmitted / received signal of each
antenna element. Because of this, it is possible to estimate an arrival direction of the received signal and to control
radiation beam pattern of the transmitted signal.