Radio communication system
First Claim
1. A radio communication system comprising:
- a radio communication terminal;
a base station for performing radio communication with the radio communication terminal; and
a control station connected to the base station via an optical transmission line;
said base station comprisingan array antenna comprising a plurality of antenna elements, anda feedback unit configured to feed respective transmitted signals corresponding to said antenna elements transmitted from said control station via said optical transmission line back to said control station via said optical transmission; and
said control station comprisinga comparing detection unit configured to compare at least two signals among said respective transmitted signals fed back from said feedback unit, and detecting a phase difference and/or an amplitude fluctuation amount, anda compensation unit configured to compensate for the respective transmitted signals corresponding to said plurality of antenna elements based on the phase difference and/or the amplitude fluctuation amount detected by said comparing detection unit.
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Accused Products
Abstract
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 wave multiplex 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.
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Citations
6 Claims
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1. A radio communication system comprising:
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a radio communication terminal; a base station for performing radio communication with the radio communication terminal; and a control station connected to the base station via an optical transmission line; said base station comprising an array antenna comprising a plurality of antenna elements, and a feedback unit configured to feed respective transmitted signals corresponding to said antenna elements transmitted from said control station via said optical transmission line back to said control station via said optical transmission; and said control station comprising a comparing detection unit configured to compare at least two signals among said respective transmitted signals fed back from said feedback unit, and detecting a phase difference and/or an amplitude fluctuation amount, and a compensation unit configured to compensate for the respective transmitted signals corresponding to said plurality of antenna elements based on the phase difference and/or the amplitude fluctuation amount detected by said comparing detection unit. - View Dependent Claims (2, 3)
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4. A radio communication system comprising:
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a base station for performing radio communication with a radio communication terminal; and a control station connected to the base station via an optical transmission line; said base station comprising an array antenna comprising a plurality of antenna elements, and a feedback unit configured to feed respective transmitted signals corresponding to said antenna elements transmitted from said control station via said optical transmission line back to said control station via said optical transmission line; said control station comprising a comparing detection unit configured to compare at least one of said respective transmitted signals corresponding to said plurality of antenna elements with at least one of the signals fed back from said feedback unit, and detecting an absolute phase difference and/or an absolute amplitude fluctuation amount of both signals, and a compensation unit configured to compensate for the respective transmitted signals corresponding to said plurality of antenna elements based on the comparison result of said comparing detection unit. - View Dependent Claims (5, 6)
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Specification