Signal oscillation method for time-division duplex radio transceiver and apparatus using the same
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United States of America Patent
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-
Jun 7, 1994
Grant Date -
N/A
app pub date -
Jan 8, 1992
filing date -
Jan 25, 1991
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A time-division duplex radio transceiver is disclosed which can avoid the deterioration of reception sensitivity and interferences in other radio communication equipments of the same kind which may be caused in the conventional transceiver by generation in the transceiver of an interfering signal of a transmission frequency or a frequency in the vicinity thereof, even upon reception. In the time-division duplex radio transceiver according to the present invention, in order to generate a carrier frequency signal in the transmission state or an intermediate frequency in a transceiver portion, there are provided an oscillator for oscillation at a frequency higher than the carrier frequency and the intermediate frequency, and frequency dividers for frequency-dividing an output of the oscillator, where the operation of the frequency dividers is stopped in the reception state. Accordingly, while the oscillation of the oscillator is always continued, it is possible to prevent the transmission frequency or the frequency in the vicinity thereof from being generated in the transceiver in the reception state.
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