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:
May. 28, 2002
Filed:
Mar. 03, 1999
Jong-Hyeon Park, Seoul, KR;
Je-Woo Kim, Songnam, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
A spread spectrum apparatus for a code division multiple access communication system maintains orthogonality between transmission signals. In the spread spectrum apparatus, a spreader combines first and second input signals with corresponding pseudo noise sequences to generate first and second spread signals. A zero-crossing detector determines whether zero-crossing occurs between the first spread signal and the second spread signal to generate a zero-crossing detection signal. A first delay staggers the first spread signal in a first direction and a second delay staggers the second spread signal in a second direction. A first selector selects one of the first spread signal and a first staggered signal and a second selector selects one of the second spread signal and a second staggered signal in response to the zero-crossing detection signal. Accordingly, first and second staggered signals are selected when zero-crossing occurs, and first and second spread signals are selected when zero-crossing does not occur, thereby maintaining orthogonality of transmission signals.