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:
Jul. 07, 2009
Filed:
Jun. 29, 2006
Sang Hyun Min, Kyungki-Do, KR;
Hyung Jin Choi, Seoul, KR;
Jung Su Han, Kyungki-Do, KR;
Joo Hyun DO, Seoul, KR;
Tah Joon Park, Kyungki-Do, KR;
Kwang Mook Lee, Seoul, KR;
Koon Shik Cho, Seoul, KR;
U Sang Lee, Kyungki-Do, KR;
Sang Hyun Min, Kyungki-Do, KR;
Hyung Jin Choi, Seoul, KR;
Jung Su Han, Kyungki-Do, KR;
Joo Hyun Do, Seoul, KR;
Tah Joon Park, Kyungki-Do, KR;
Kwang Mook Lee, Seoul, KR;
Koon Shik Cho, Seoul, KR;
U Sang Lee, Kyungki-Do, KR;
Samsung Electro-Mechanics Co., Ltd., Suwon, Kyungki-Do, KR;
Abstract
The invention relates to a symbol detector for detecting symbols received in a receive modem of short-range wireless personal area network of a ZigBee system (IEEE 802.15.4). An OQPSK short-range wireless communication system according to the invention acquires frequency offset in a received signal using a symbol contained in a preamble of a packet of the signal, multi-delay-differentiates the signal by a plurality of predetermined delay times, and complex-conjugates the acquired frequency offset to eliminate the frequency offset. Then, the OQPSK short-range wireless communication system according to the invention correlates the received signal with a PN sequence delay-differentiated through the same process to detect the symbols corresponding to the received signal.