Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate
2001-12-11
2009-08-04
Yun, Eugene (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
C455S071000, C455S118000
Reexamination Certificate
active
07570919
ABSTRACT:
Transmitter and receiver for wireless communications with improved accuracy and stability in radio frequency control. A transmitter mixes an information-carrying signal (first signal) and a non-modulated wave signal (second signal) with a carrier signal, thereby producing a first and second radio frequency signals for radio wave transmission. A receiver mixes those two radio frequency signals to extract the original information signal. While the received radio frequency signals contain some frequency fluctuations and phase noises that have been introduced at the sending end, such unstable components Δf will cancel out at the receiving end.
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Hirachi Yasutake
Nakano Hiroshi
Fujitsu Quantum Devices Limited
Westerman, Hattori, Daniels & Adrian , LLP.
Yun Eugene
LandOfFree
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