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:
Jan. 24, 2017
Filed:
Sep. 10, 2015
Qualcomm Incorporated, San Diego, CA (US);
Alexander Dorosenco, El Cajon, CA (US);
Roy Franklin Quick, Jr., San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A method and apparatus for reducing distortion of satellite signals modulated using amplitude phase shift keying (APSK) are disclosed. A receiver such as a user terminal receives, from a satellite, a signal including APSK-modulated symbols mapped to a constellation including a plurality of points arranged in an inner circle and in an outer circle; determines, based on the received APSK-modulated symbols, a ratio between a radius of the inner circle of the constellation and a radius of the outer circle of the constellation; generates a correction signal based, at least in part, on a comparison between the determined ratio and a reference ratio; compensates for distortion of the received signal based, at least in part, on the correction signal; mixes the correction signal with the received signal to generate a distortion-compensated signal; and de-modulates the distortion-compensated signal to recover data transmitted from the satellite.