Upstream frequency control for docsis based satellite systems

Details Upstream frequency control for docsis based satellite systems Upstream frequency control for docsis based satellite systems

2003-01-28

2008-12-09

Lugo, David B (Department: 2611)

Pulse or digital communications

Synchronizers

Network synchronizing more than two stations

C375S373000

Reexamination Certificate

active

07463707

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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