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:
Oct. 19, 2004
Filed:
Feb. 01, 2001
Dojun Rhee, Irvine, CA (US);
Advait Mogre, Sunnyvale, CA (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
The method of the present invention decodes a received symbol that represents data bits including message bits and parity-check bits. The method comprises (a) mapping the symbol onto a received signal point in a signal space, the signal point having an in-phase component (I) and a quadrature phase component (Q) in the signal space; (b) computing reliability information for each data bit, the reliability information associated with a distance d ={square root over ((I−I ) +(Q−Q ) )} between the received signal point (I, Q) and a reference constellation point (I , Q ) in the signal space, where i=0, 1, . . . , M−1 (for M an integer), by replacing calculation of (I−I ) +(Q−Q ) with calculation of 2(I ×I+Q ×Q); (c) decoding the received symbol using the reliability information and a priori information to produce estimated message bits, the a priori information having a predetermined value in a first decoding; (d) calculating difference between received message bits and the estimated message bits to produce extrinsic information of estimated message bits; and (e) repeating at least once the mapping, computing, decoding and calculating, using the extrinsic information produced in a preceding calculating as the a priori information.