| 摘要 |
PURPOSE: To improve a service block between cells by detecting selected electromagnetic signals more than one, comparing them with a predetermined retransmission reference and rebroadcasting a selected member. CONSTITUTION: A cell site 12 has a transmission/reception antenna 14, and a booster 16 has a directional transmission/reception antenna 18 for transmitting/ receiving signals with the cell site 12 and a 2nd antenna 20 for exchanging signals with a moving body M. The signals from the cell site 12 is passed through a transmission/reception switcher 50, coupled through a multiple coupler 52, communication paths 32-40 and radio frequency power amplifiers 54a-54e by a high-power no-loss coupler 56 and sent later from the antenna 20 through a transmission/reception switcher 58 to the moving body M. The signals from the moving body M are supplied through the transmission/reception switcher 58 to a multiple coupler 60 and inputted to intermediate frequency communication paths 22-30. Further, these signals are coupled by a five-path coupler 62 and sent later from the antenna 18 through an amplifier 64 and the transmission/ reception switcher 50 to the cell site 12. By changing the frequency of transmission between the booster 16 and the moving body M, the problem of canceling signals around the booster block is relaxed. |
