Upstream frequency control for docsis based satellite systems
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United States of America Patent
Stats
-
Dec 9, 2008
Grant Date -
Mar 4, 2004
app pub date -
Jan 28, 2003
filing date -
Sep 3, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system and method for minimizing the frequency error of satellite modem signals at a satellite gateway. The gateway downstream baud (symbol) clock and the elements that control the upstream frequency (i.e., local oscillators in the conversion chain, A/D sample clocks) are locked to a common frequency reference. The gateway sends upstream satellite frequency offset information, such as satellite ephemeris data from which to calculate Doppler offset, to the satellite modem. The satellite modem locks the frequency of the satellite modems master oscillator to the recovered baud rate using a frequency locked loop. The satellite modem uses its master oscillator as the carrier reference for the upstream frequency up conversion. The satellite modem uses or calculates the upstream satellite frequency offset and compensates for this offset by shifting its center frequency.
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