Telecommunications – Transmitter – Including tuning
Reexamination Certificate
2005-11-22
2005-11-22
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter
Including tuning
C455S118000, C455S119000
Reexamination Certificate
active
06968162
ABSTRACT:
A satellite communication transmission control system includes one central station, a plurality of small aperture terminals, and one communication satellite serving as a repeater for the central and aperture terminals. This system performs communication via a frequency division multiple access communication channel. The central station includes a modulator for transmitting via a common channel a signal for controlling/monitoring the small aperture terminals on the basis of a stable clock signal. Each aperture terminal includes a modulator, transmission frequency converter, antenna/RF device, reception frequency converter, demodulator, and frequency comparator. The modulator modulates communication information. The transmission frequency converter frequency-converts a modulated wave from the modulator into a carrier signal (modulated carrier). The reception frequency converter frequency-converts the modulated carrier. The demodulator demodulates a signal received via the common channel and outputs a reception clock. The frequency comparator detects the frequency error of a local oscillator, and generates a control signal for stopping transmission of the modulated carrier until the frequency error falls within a preset tolerance range.
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Bhattacharya Sam
NEC Corporation
Trinh Sonny
LandOfFree
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