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. 04, 2004
Filed:
Feb. 15, 2000
Nortel Networks Limited, St. Laurent, CA;
Abstract
A CDMA system in which the base stations transmit a synchronization channel comprising a primary subchannel from which slot synchronization is determinate and a secondary subchannel containing a cyclic hierarchical code unique for each base station and for each slot in a frame. The cyclic code is derived from a first code unique to a base station and a different cyclic shift of a second code also unique to the base station in each slot of a frame. Mobile stations quickly and with low-complexity detectors determine slot synchronization from the primary subchannel and then determine base station identification and frame synchronization by correlating samples of signal received on the secondary subchannel with a set of first codes and cyclic shifts of corresponding second codes.