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:
Feb. 09, 2010
Filed:
Jan. 11, 2006
Fuyun Ling, San Diego, CA (US);
Seong Taek Chung, Redwood City, CA (US);
Jinxia Bai, San Diego, CA (US);
Thomas Sun, San Diego, CA (US);
Fuyun Ling, San Diego, CA (US);
Seong Taek Chung, Redwood City, CA (US);
Jinxia Bai, San Diego, CA (US);
Thomas Sun, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either kor k. The method selects a mismatched energy ratio (k) between kand k, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched kenergy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, kis selected to be about 5.0625. Alternately stated, the mismatched kenergy ratio in selected by determining the approximate midpoint between kand k.