| 摘要 |
PROBLEM TO BE SOLVED: To build up a radio base station of a micro-cell system economically. SOLUTION: One of high frequency signals with a frequency f1 received by diversity reception antennas 1, 2 of a relay radio base station is converted into a high frequency signal with a frequency f2 at a frequency converter 3-1 and the two high frequency signals are synthesized by a power synthesizer 4 to obtain a frequency multiplexed signal. Then the resulting signal is sent to a central radio base station through one optical system consisting of an electrooptic converter 5-1, an optical fiber transmission line 6-1, and a photoelectric converter 7-1, demultiplexed by a multiplexer demultiplexer, 8 and the high frequency signal having not be frequency-converted at the transmitter side is converted into a frequency f3 different from the frequency f2 and the converted signal and the signal with the frequency f2 are received to conduct diversity processing. |
