| 摘要 |
<p>PROBLEM TO BE SOLVED: To relay and transmit a downlink signal from any radio system without deteriorating the quality even in the case where power levels of downlink signals coming from respective radio systems are significantly different, in a multisystem adaptive radio relay apparatus for relaying radio signals from two or more radio systems.SOLUTION: A radio relay apparatus comprises: a plurality of band limiting filters 1 provided on a prestage of a low noise amplifier 5; an ATT part 2; a switch part 3 and a switch part 4 each for routing a downlink reception signal from each of radio base stations received from a donor antenna 11; a relay amplification part 8 for each of the radio base stations; a reception power detection part 9 for detecting a reception power level for each radio base station; and a control part 6 which performs routing of the switch 3 and the switch 4 for adjusting the reception power level. Only reception power from a radio base station of a strong input signal is adjusted.</p> |
