| 摘要 |
PROBLEM TO BE SOLVED: To simplify the construction of a system by reducing the number of wiring for connecting a transmission/reception antenna having directivity for each sector and a MODEM. SOLUTION: A device 20 is composed of transmission/reception antennas 11-14, radio transmission/reception parts 15a-18a, A/D converters 15b-18b, parallel signal transmission line Cb, a switcher 21 at a sector switching controller 20, P/S converters 22-24, control part 25, MODEMs 29-31, a central control unit 32, a control signal line 33 and a serial signal line Cd. In this case, the service area of one cell base station is divided into plural sectors and based on the position relation in the movement of a mobile terminal, plural, such as two to four transmission/reception antennas are connected to the MODEMs 29-31 by switching control for selecting these antennas. |
