| 摘要 |
PROBLEM TO BE SOLVED: To obtain a local signal with high accuracy without providing an expensive local oscillator on a subscriber station side, to suppress the burden of the subscriber side and to improve reliability by synthesizing a subscriber station side local signal with a base station side local signal by using a phase- locked loop. SOLUTION: A base station 1 side produces a sending wave RF by superimposing a base station side internal local signal CLO and an intermediate frequency signal IF and also takes out the signal IF from the wave RF by using a subscriber station side local signal ALO a subscriber station 2 side. Non- modulation wave of a base station side local signal BLO (having the same frequency as the signal ALO) is simultaneously sent from the station 1 to the station 2 together with the wave RF in a prescribed band or its neighborhoods, and also the signal ALO is synchronized by the signal BLO and a phase-locked loop(PLL) 3. Furthermore, the signal BLO is sent together with the wave RF by using a synthesizer (COMB). |
