The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2008
Filed:
Jan. 28, 2003
Mark Dale, Laguna Hills, CA (US);
Dorothy D. Lin, Laguna Beach, CA (US);
Alan Gin, Corona Del Mar, CA (US);
David L. Hartman, Laguna Hills, CA (US);
Rocco J. Brescia, Jr., Newport Coast, CA (US);
Ravi Bhaskaran, Irvine, CA (US);
Jen-chieh Chien, Lake Forest, CA (US);
Adel Fanous, Irvine, CA (US);
Mark Dale, Laguna Hills, CA (US);
Dorothy D. Lin, Laguna Beach, CA (US);
Alan Gin, Corona Del Mar, CA (US);
David L. Hartman, Laguna Hills, CA (US);
Rocco J. Brescia, Jr., Newport Coast, CA (US);
Ravi Bhaskaran, Irvine, CA (US);
Jen-chieh Chien, Lake Forest, CA (US);
Adel Fanous, Irvine, CA (US);
Broadcom Corporation, Irvine, CA (US);
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.