(54) WIRELESS COMMUNICATION SYSTEM AND METHOD USING GROUPING MAXIMUM LIKELIHOOD DETECTION
(75) Inventors: Seog-Ill Song, Daejeon (KR);
Hyun-Seo Oh, Daejeon (KR)
(73) Assignee: Electronics and Telecommunications Research Institute (KR)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 630 days.
(21) Appl. No.: 10/729,755
(22) Filed: Dec. 4, 2003
(65) Prior Publication Data
US 2004/0120415 Al Jun. 24, 2004
(30) Foreign Application Priority Data
Dec. 24, 2002 (KR) 10-2002-0083746
(51) Int. CI.
H04B 1/69 (2006.01)
(52) U.S. CI 375/130
(58) Field of Classification Search 375/262,
375/347, 144, 148, 267, 341, 130; 455/63, 455/64; 714/794,795 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
5,425,050 A * 6/1995 Schreiber et al 375/141
5,809,060 A 9/1998 Cafarella et al.
5,856,971 A * 1/1999 Gitlin et al 370/335
5,960,032 A 9/1999 Letaiefetal.
6,041,034 A 3/2000 Fukumasa et al.
6,075,812 A 6/2000 Cafarella et al.
Disclosed is a method for increasing a data transfer rate without an increase in the whole bandwidth using intrinsic spreading codes and orthogonal codes. The method uses interleaving, OFDM modulation/demodulation, and maximum likelihood detection (MLD) to overcome the effects of multipath fading or signal interference, determines grouped optimal values by a grouping method of dividing the intrinsic spreading codes in series, and calculates an integrated optimal value for all the intrinsic spreading codes using the grouped optimal values, thereby reducing the complexity of MLD according to the length of the intrinsic spreading code and acquiring an improved performance.
8 Claims, 3 Drawing Sheets
