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:
May. 15, 2001
Filed:
Apr. 24, 1998
Dojun Rhee, San Jose, CA (US);
Chanthachith Souvanthong, Tourcoing, FR;
LSI Logic Corporation, Milpitas, CA (US);
Abstract
An apparatus for recovering information bits from in-phase and quadrature components of a stream of quadrature amplitude modulation (QAM) trellis code modulation (TCM) signals is disclosed. Each signal has an in-phase component and a quadrature component. The in-phase component includes a decoded bit and a plurality of uncoded in-phase bits and the quadrature component includes a decoded quadrature bit and a plurality of uncoded quadrature bits. The apparatus includes a reencode and puncturing circuitry, an inverse mapping circuitry, and a recovery circuitry. The reencode and puncture circuitry is adapted to receive the in-phase and quadrature components of a QAM TCM signal for encoding the decoded in-phase and quadrature bits. The reencode and puncture circuitry punctures the encoded in-phase bit with the uncoded in-phase bits to generate an in-phase component index. In addition, the reencode and puncture circuitry punctures the encoded quadrature bit with the remaining quadrature bits to generate a quadrature component index. The inverse mapping circuitry is coupled to the reencode and puncture circuitry to receive the in-phase component index and the quadrature component index for recovering a first set of in-phase bits and a second set of quadrature bits. The recovery circuitry is coupled to the inverse mapping circuitry to receive the first set of in-phase bits and the second set of quadrature bits. The recovery circuitry is also coupled to receive the decoded in-phase and quadrature bits. The recovery circuitry recovers a set of information bits by assembling the received bits.