Transmitter, receiver, and radio communications system and method
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United States of America Patent
Stats
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Aug 4, 2009
Grant Date -
Aug 1, 2002
app pub date -
Dec 11, 2001
filing date -
Dec 13, 2000
priority date (Note) -
Expired
status (Latency Note)
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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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