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:
Sep. 18, 2012
Filed:
Dec. 21, 2009
Hyun Seo OH, Daejeon, KR;
Hyun Kyun Choi, Daejeon, KR;
Sangin Kim, Mungyeong-si, KR;
Daeki Hong, Seoul, KR;
Dong Yong Kwak, Daejeon, KR;
Jong-hyun Park, Daejeon, KR;
Hyun Seo Oh, Daejeon, KR;
Hyun Kyun Choi, Daejeon, KR;
Sangin Kim, Mungyeong-si, KR;
Daeki Hong, Seoul, KR;
Dong Yong Kwak, Daejeon, KR;
Jong-Hyun Park, Daejeon, KR;
Electronics & Telecommunications Research Institute, Daejeon, KR;
Abstract
An apparatus for time synchronization of an orthogonal frequency division multiplexing (OFDM) system oversamples a received signal using a master clock having a frequency at least four times higher than a minimum sampling frequency in a transmission apparatus, sets one of a plurality of oversampled signals to an on-time signal, and shifts each of the remaining oversampled signals by a predetermined time on the basis of the on-time signal. The apparatus for time synchronization calculates a correlation value by correlating each of the shifted signals and the on-time signal with a previously known signal, detects a maximum energy value among the calculated correlation values, and detects a start point of a frame by comparing the maximum energy value with a predetermined threshold value.