| 摘要 |
PURPOSE: To eliminate deterioration in transmission quality due to nonlinearity in electro/optic converter and photoelectric converter with respect to radio signal transmitter using an optical transmission line. CONSTITUTION: Transmission signal processing circuits 341 , 491 of a radio central station 221 and a radio base station 231 convert an analog radio modulation signal from a modulator 311 or a low noise amplifier 47 into a digital radio modulation signal. An electro/optic converter 35 converts the digital radio modulation signal being an electric signal into an optical signal. A photoelectric converter 37 converts the optical signal received via an optical transmission line into a digital radio modulation signal being an electric signal. Reception signal processing circuits 381 , 441 of the radio central station 221 and the radio base station 231 convert th digital radio modulation signal from the photoelectric converter 37 into an analog radio modulation signal. |
