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:
Jun. 29, 2010
Filed:
Jun. 24, 2005
Yong-su Lee, Daejeon, KR;
Youn-ok Park, Daejeon, KR;
Jun-woo Kim, Daejeon, KR;
Young-jo Bang, Daejeon, KR;
Yong-Su Lee, Daejeon, KR;
Youn-Ok Park, Daejeon, KR;
Jun-Woo Kim, Daejeon, KR;
Young-Jo Bang, Daejeon, KR;
Samsung Electronics Co., Ltd., , KR;
Electronics and Telecommunications Research Institute, , KR;
KT Corporation, , KR;
SK Telecom Co., Ltd., , KR;
KTFreetel Co., Ltd., , KR;
Hanaro Telecom, Inc., , KR;
Abstract
The present invention relates to a method for automatic gain control (AGC) before an initial synchronization of a mobile station modem in OFDM system, and an apparatus thereof. The AGC apparatus includes: an initial synchronization inspector that verifies whether an initial synchronization for an input block sample (k) signal has been performed; a frame divider that divides a frame into predetermined intervals B(k) for the input block sample(k) signal in the case that the initial synchronization has not been performed; a reference value inspector that compares a difference value Pref−Pcalc, between a predetermined reference value Pref and sample data average energy Pcalc, with a predetermined value; a count controller that increases or decreases the count when the difference value Pref−Pcalc compared by the reference value inspector is greater or less than the predetermined value; a count inspector that inspects whether the count is greater or less than 0 when the input block sample (k) reaches a maximum value MAX; and a gain controller which increases or decreases the gain, level by level, according to the count inspection result of the count inspector.