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. 14, 2012
Filed:
Dec. 07, 2006
Dae-ig Chang, Daejon, KR;
Deock-gil OH, Daejon, KR;
Kwang-min Hyun, Seoul, KR;
Dong-weon Yoon, Seoul, KR;
Sang-kyu Park, Gyeonggi-do, KR;
Dae-Ig Chang, Daejon, KR;
Deock-Gil Oh, Daejon, KR;
Kwang-Min Hyun, Seoul, KR;
Dong-Weon Yoon, Seoul, KR;
Sang-Kyu Park, Gyeonggi-do, KR;
Abstract
Provided are an apparatus and method for generating a soft bit metric and a multi-level (M-ary) Quadrature Amplitude Modulation (QAM) receiving system using the same. The apparatus includes an analog to digital converter for converting an analog symbol signal of a demodulated I (Inphase) or Q (Quadrature) channel into a digital signal, a scaler for scaling the converted digital signal based on a reference value used for determining a space between symbols, a positive integer converter for calculating a positive integer of the scaled digital I or Q channel symbol signal, a sign determinator for determining a sign of the scaled digital I or Q channel symbol signal, and a bit information converter for converting the scaled digital I or Q channel symbol signal into soft bit metric information per bit on the basis of the calculated positive integer and the determined sign value.