Compensation of reference frequency drift in system...

Details Compensation of reference frequency drift in system... Compensation of reference frequency drift in system...

2007-03-27

2007-03-27

Kumar, Pankaj (Department: 2611)

Pulse or digital communications

Synchronizers

Feedback, receiver to transmitter

Reexamination Certificate

active

10136060

ABSTRACT:
Systems and methods are disclosed for to compensating reference frequency drift in a communications system having a plurality of modems and a headend, where the system requires critical upstream timing. One embodiment of the method includes learning or determining the relative delay of each modem and reporting each modem's unique delay (relative to the closest modem) to the headend. The method further includes the headend monitoring its own reference for frequency drift, the modem broadcasting pertinent frequency drift information to the modems and adjusting the modems' upstream timing to account for each modem's unique distance (i.e., delay) combined with the broadcast stream of frequency drift information.

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Jeffrey A. Young,Analysis of DFT-Based Frequency Excision Algorithms for Direct-Sequence Spread-Spectrum Communicaitons, Aug. 1998; pp. 1076-1087.

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