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    • 19. 发明申请
    • OPTICAL FIBER RADIO TRANSMISSION SYSTEM, TRANSMISSION DEVICE, AND RECEPTION DEVICE
    • 光纤无线电传输系统,传输设备和接收设备
    • WO2005057815A8
    • 2005-07-21
    • PCT/JP2004017355
    • 2004-11-22
    • MATSUSHITA ELECTRIC IND CO LTDHASE KAZUTOSHIYAMAMOTO HIROAKIUTSUMI KUNIAKI
    • HASE KAZUTOSHIYAMAMOTO HIROAKIUTSUMI KUNIAKI
    • H04B10/40H03F3/08H04B10/07H04B10/2507H04B10/2575H04B10/293H04B10/50H04B10/54H04B10/564H04B10/58H04B10/60H04B10/18H04B10/04H04B10/06
    • H04B10/25759H03F3/08
    • There is provided an optical fiber radio transmission system capable of significantly improving the reception dynamic range of a radio signal and performing optical transmission of a radio signal without deteriorating the transmission quality or losing the linearity of an input signal. A reception level detection unit (111) detects which of predetermined levels I to III the reception level of the radio signal received by an antenna (400) corresponds to. According to the level detected, a signal control unit (112) performs amplification/attenuation of the radio signal. A control information transmission unit (113) superimposes the control information indicating the detected level on the main signal after the amplification/attenuation. This signal is converted into an optical signal and transmitted. A photo/electric conversion unit (211) converts the optical signal received from the transmission device side, into an electric signal. A control information extraction unit (212) extracts the level from the control information superimposed on the main signal. A signal control unit (213) performs amplification/attenuation of the main signal according to the level detected.
    • 提供了一种光纤无线电传输系统,其能够显着改善无线电信号的接收动态范围并且执行无线电信号的光传输,而不会降低传输质量或者丧失输入信号的线性。 接收电平检测单元(111)检测由天线(400)接收的无线电信号的接收电平对应于预定电平I至III中的哪一个。 根据检测到的电平,信号控制单元(112)执行无线电信号的放大/衰减。 控制信息传输单元(113)在放大/衰减之后将指示检测到的电平的控制信息叠加在主信号上。 该信号被转换成光信号并被发送。 光/电转换单元(211)将从发送装置侧接收的光信号转换为电信号。 控制信息提取单元(212)从叠加在主信号上的控制信息中提取等级。 信号控制单元(213)根据检测到的电平执行主信号的放大/衰减。