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:
Jul. 22, 2008
Filed:
Aug. 27, 2004
Ernest C. Chen, San Pedro, CA (US);
Dennis Lai, Cerritos, CA (US);
Tung-sheng Lin, Alhambra, CA (US);
William C. Lindsey, Pasadena, CA (US);
Shamik Maitra, Redondo Beach, CA (US);
Joseph Santoru, Agoura Hills, CA (US);
Guangcai Zhou, Reseda, CA (US);
Ernest C. Chen, San Pedro, CA (US);
Dennis Lai, Cerritos, CA (US);
Tung-Sheng Lin, Alhambra, CA (US);
William C. Lindsey, Pasadena, CA (US);
Shamik Maitra, Redondo Beach, CA (US);
Joseph Santoru, Agoura Hills, CA (US);
Guangcai Zhou, Reseda, CA (US);
The DIRECTV Group, Inc., El Segundo, CA (US);
Abstract
A simplified scrambling scheme that unifies all signals of a satellite broadcasting system, including frame header (), frame body () and pilot symbols () with a common reference phase. This results in the simplification and increased flexibility of the receiver front-end design without affecting the overall system performance. In many current communications systems with frame headers and pilot symbols, the phases of frame headers and pilot syrnbols are not designed to be aligned with any constellation points of the modulated data from the frame body. This scrambling scheme takes into account possible impact due to irregular phase changes between frame headers/pilot symbols and modulated data.