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. 06, 2004
Filed:
May. 23, 2000
Roy Xun Yang, Buffalo Grove, IL (US);
Stefan Paun, Park Ridge, IL (US);
Jiangnan Jason Chen, Darien, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for system time alignment is provided. The method and apparatus for a system time alignment provides synchronization between system components even when one or more system components remains in a quiescent mode for an extended period of time. Compensation for changes in propagation delay between system components is provided, even when such changes in propagation delay occur while one or more system components is in a quiescent mode. A searcher ( ) searches a raw data signal for a maximal energy, and a shifter ( ) shifts a spreading sequence a plurality of times. An accumulator ( ) accumulates a plurality of sets of symbols to produce a plurality of symbol energies. A time offset calculator ( ) calculates an updated time offset value and an updated system time value and updates a reference position counter ( ) and a system time counter ( ), respectively, with these values.