| US 7,580,400 B2 | ||
| Apparatus and method for generating preamble signal for cell identification in an orthogonal frequency division multiplexing system | ||
| Sang-Hoon Sung, Suwon-si (Korea, Republic of); Joong-Ho Jeong, Seoul (Korea, Republic of); Yun-Sang Park, Suwon-si (Korea, Republic of); Soon-Young Yoon, Seongnam-si (Korea, Republic of); and Tae-Gon Kim, Seoul (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd, (Korea, Republic of) | ||
| Filed on Nov. 18, 2004, as Appl. No. 10/991,895. | ||
| Claims priority of application No. 10-2003-0083037 (KR), filed on Nov. 21, 2003. | ||
| Prior Publication US 2005/0111522 A1, May 26, 2005 | ||
| Int. Cl. H04B 7/216 (2006.01); H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—342 [370/430; 370/479; 370/208; 370/209; 370/203; 370/343; 370/320; 370/335; 370/441; 375/140; 375/141; 455/446; 455/447] | 15 Claims |
| 1. A method of generating a preamble signal in an orthogonal frequency division multiple access (OFDMA) mobile communication
system, the method comprising the steps of:
generating, at a Walsh code generator of the OFDMA mobile communication system, a Walsh symbol for a cell identification by
combining Walsh codewords having a predetermined length; and
generating, at a multiplier of the OFDMA mobile communication system, the preamble signal by multiplying the Walsh symbol
by a pseudo noise (PN) symbol having a length identical to a length of the Walsh symbol,
wherein the step of generating a Walsh symbol further comprises generating, at a mini Walsh group generator of the Walsh code
generator, a mini Walsh group for the cell identification and repeating the mini Walsh group by a predetermined number of
times to generate the Walsh symbol, and
wherein the step of generating the mini Walsh group comprises determining at least one Walsh codeword index and aligning at
least one Walsh codeword corresponding to the determined at least one Walsh codeword index, and the at least one Walsh codeword
is selected according to
cm=(ac×m+sc) mod p, wherein C of ac and sc is cell ID information of each cell, m is a Walsh codeword interval index of a
specific mini Walsh group Wg, ac is a slope of a cell C, sc is an initial Walsh codeword index, and mod is a modulo operation.
|