Data transmission system, data transmission communication station, and data transmission method
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United States of America Patent
Stats
-
Nov 2, 2004
Grant Date -
N/A
app pub date -
Sep 10, 1999
filing date -
Sep 11, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data transmission system for transmitting data from a transmitter to a receiver located away therefrom. The transmitter includes circuitry for transmitting together a main signal having a carrier modulated with main data to be transmitted and as well as a sub-signal to be used in frequency conversion and generated by modulating a carrier of a predetermined frequency out of a frequency band of the main signal. The receiver includes circuitry for receiving a receive signal from the transmitter and extracting the sub-signal therefrom and also includes circuitry for generating a signal to be used as a reference at the time of converting the receive signal to a signal having a predetermined frequency on the basis of the extracted sub-signal.
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