(12) United States Patent (io) Patent No.: US 6,522,687 B2
Park et al. (45) Date of Patent: Feb. 18,2003
(54) DATA TRANSMITTER AND RECEIVER OF A DS-CDMA COMMUNICATION SYSTEM
(75) Inventors: Jong-Hyeon Park, Seoul (KR);
Je-Woo Kim, Suwon (KR)
(73) Assignee: Samsung Electronics Co., Ltd., Suwon (KR)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/775,600
(22) Filed: Feb. 5, 2001
(65) Prior Publication Data
US 2001/0005394 Al Jun. 28, 2001
Related U.S. Application Data
(62) Division ol application No. 09/105,219, filed on Jun. 26, 1998.
(51) Int. CI.7 H04B 15/00; H04K 1/00;
(52) U.S. CI 375/149; 375/147
(58) Field of Search 375/144, 147,
375/141, 145, 149, 130, 140; 370/320, 335, 342, 441
(56) References Cited
U.S. PATENT DOCUMENTS
A data transmitter and receiver in a DS-CDMA communication system designed to prevent a serious amplitude shift in a transmission signal, facilitate recovery of data and clock signals and relieve the constraint of using a high linearity, high performance amplifier. The data transmitter includes a spread signal generating device, in which I-arm and Q-arm information signals of the first channel are spread by I-arm and Q-arm PN codes, respectively, and I-arm and Q-arm information signals of a predetermined number of following channels are spread by an inverted Q-arm PN code and the I-arm PN code, respectively. The data receiver includes a despread signal generating device, in which an I-arm despread signal is generated by multiplying I-arm and Q-arm digital baseband spread signals by I-arm and Q-arm PN codes, respectively, and adding the multiplication results, while a Q-arm despread signal is generated by multiplying Q-arm and I-arm digital baseband spread signal by an inverted I-arm PN code and the Q-arm PN code, respectively, and adding the multiplication results.
8 Claims, 6 Drawing Sheets