Patent ID: 6125138
Filing Date: 2000-09-26
Classification: H04L

Abstract:
A transmitter-receiver of a base station for repeating transmission and reception modes, transmitting a signal in the transmission mode, and receiving a signal in the reception mode, and establishing synchronization of transmission and reception timing between base stations using air synchronization, said transmitter-receiver comprising:a transmission power amplifier turned on in the transmission mode for inputting a transmission signal to an antenna and turned off in the reception mode;a front end for amplifying an antenna reception signal and frequency-converting the signal;a demodulator provided on an output side of said front end for demodulating data from the reception signal; andattenuating means provided between said front end and the antenna for attenuating the reception signal in a synchronous reception mode, in which mode transmission and reception timing of this base station is synchronized to transmission and reception timing of another base station, and not attenuating the reception signal in an ordinary reception mode.