| US 7,596,181 B2 | ||
| Apparatus and method for frequency synchronization in OFDM system | ||
| Jin-Weon Chang, Suwon-si (Korea, Republic of); Hwan-Joon Kwon, Suwon-si (Korea, Republic of); Dong-Hee Kim, Yongin-si (Korea, Republic of); Youn-Sun Kim, Seongnam-si (Korea, Republic of); and Jin-Kyu Han, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., Suwon-Si (Korea, Republic of) | ||
| Filed on Sep. 16, 2005, as Appl. No. 11/227,325. | ||
| Claims priority of application No. 10-2004-0074890 (KR), filed on Sep. 18, 2004. | ||
| Prior Publication US 2006/0062317 A1, Mar. 23, 2006 | ||
| Int. Cl. H04K 1/10 (2006.01) | ||
| U.S. Cl. 375—260 [375/267; 375/316; 370/203; 370/210; 370/348; 370/344; 455/296] | 17 Claims |
| 1. A method for frequency synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising
the steps of:
dividing data symbols of a particular OFDM symbol into at least two Fast Fourier Transform (FFT) parts each having cyclic
prefixes;
transmitting OFDM symbols including the divided FFT parts such that a data symbol size of a particular OFDM symbol is set
to be smaller than a data symbol size of typical OFDM symbols within a frame;
receiving the particular OFDM symbol and calculating respectively correlation coefficients of the particular OFDM symbol based
on both a time interval of data symbols of the particular OFDM symbol and a time interval of data symbols of the typical OFDM
symbol;
taking respectively phases of corresponding correlation coefficients calculated from the particular OFDM symbol and estimating
a decimal part of a frequency offset; and
determining an integer part of the frequency offset corresponding to the decimal part of the frequency offset for estimating
a substantially entire frequency offset and acquiring the frequency synchronization;
wherein a total size of the cyclic prefixes in each of the FFT parts is larger than the size of the cyclic prefix of the typical
OFDM symbol.
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