Base station transmitter-receiver
First Claim
1. 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; and
attenuating 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.
1 Assignment
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Accused Products
Abstract
In a case where transmission and reception timing of a base station has not been synchronized to that of another base station in the vicinity, or in a case where it is necessary to establish such synchronization, a synchronous controller outputs a reception-mode changeover signal to change the prevailing mode from an ordinary reception mode to a synchronous control reception mode. As a result, attenuating means attenuates a strong input signal from the other base station and enters the attenuated signal into a demodulator via a front end. The demodulator proceeds to demodulate the received data. The synchronous controller detects synchronization information (a synchronizing word) from the received data to synchronize the transmission and reception timings of the two base stations and then returns the reception mode to the ordinary reception mode.
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Citations
10 Claims
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1. 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:
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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; and attenuating 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. - View Dependent Claims (2, 3, 4, 5)
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6. 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 timings between base stations using air synchronization, said transmitter-receiver comprising:
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a transmission power amplifier turned on in the transmission mode and turned off in the reception mode; a front end for amplifying a reception signal and frequency-converting the signal; an antenna switch for connecting an antenna to a transmission side 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 in the transmission mode, and connecting the antenna to a reception side in an ordinary reception mode; a demodulator provided on an output side of said front end for demodulating data from the reception signal; and means provided between said front end and said antenna switch for attenuating an input signal in the transmission mode and passing the reception signal in the synchronous reception mode and in the ordinary reception mode. - View Dependent Claims (7, 8, 9, 10)
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Specification