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:
Dec. 25, 2007
Filed:
Jul. 10, 2002
Kwang-chul Kim, Seoul, KR;
Kwang-Chul Kim, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
A method for synchronizing symbol timing and frequency of symmetric-identical (SI) Orthogonal Frequency Division Multiplexed signals (OFDM) wherein an SI preamble is used for calculation of the symbol timing and frequency synchronism offset of the OFDM signals out of the samples of the received signals is provided. The SI preamble includes a first sample group and a second sample group, being alternately arrayed several times, in which the first sample group includes a designated number of samples that are arrayed in order of arrival, while the second sample group includes the same number of samples with the first sample group, but in inverse order of arrival. Because distinctive correlation coefficients of the identical samples are very distinctive from each other, it is possible to estimate a starting point of the OFDM symbol more precisely. Using the SI preamble, both symbol synchronism and a fine frequency offset and a coarse frequency offset can be estimated. Moreover, the transmission efficiency and the overall capacity of the OFDM system are greatly improved.