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:
Apr. 16, 2002
Filed:
Dec. 31, 1998
Jong-Hyeon Park, Seoul, KR;
Je-Woo Kim, Kyonggi-do, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
A circuit and process for generating spread signals using orthogonal codes in a DS-CDMA mobile communication system. The process and circuit contemplate the use of a zero-crossing detector for detecting an I-channel signal and a Q-channel signal to generate a zero-crossing detection signal, a delay for phase-delaying the Q-channel signal by 90°, and a multiplexer for outputting one of the Q-channel signal and the phase-delayed signal according to the zero-crossing detection signal. The multiplexer outputs the Q-channel signal to maintain an orthogonality between the I-channel signal and the Q-channel signal, when the zero-crossing is not detected. When the zero-crossing is detected however, the multiplexer phase-delays the Q-channel signal by 90° and outputs the phase-delayed Q-channel signal to maintain a ½ chip offset. Therefore, the device can minimize phase errors, maintaining an orthogonality between the I-channel signal and the Q-channel signal.