SIGNAL TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To reduce the power consumption of a transmission station by selecting carrier frequencies given to an electrooptic conversion circuit of a transmission station so as not to be in the relation of multiple. SOLUTION: A slave station A being a transmission station and a master station B being a reception station are connected by an optical fiber 6 being an optical transmission line. A signal is sent between mobile terminal equipments C-1 to C-n and the slave station A by a radio channel and between the slave station A and the master station B by the optical fiber 6. The signal from the mobile terminal equipments C-1 to C-n is received by an antenna 1 of the slave station A. The reception signal is given to a frequency setting circuit 2, in which the frequency of the signal is set to a frequency not being affected by interference by intermodulation distortion and harmonic distortion. A synthesis circuit 3 synthesizes the signals whose frequency is set and the resulting signal is given to an amplifier 4. The signal amplified by the amplifier 4 is converted into an optical signal by an electrooptic conversion circuit 5 and sent to the master station B through the optical fiber 6.