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:
Oct. 21, 2003
Filed:
May. 31, 2001
Alexandre Mallette, Chicago, IL (US);
John Paul Oliver, Chicago, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method for estimating Doppler spread in mobile wireless communication devices, for example in CDMA or W-CDMA cellular communication systems, with improved noise immunity. The Doppler spread estimation is based on an estimated value of an autocorrelation or autocovariance at a first lag ( ) and at a second lag ( ), the magnitude of which is greater than the first lag. A first ratio is determined ( ) between a first difference ( ) and a second difference ( ). The estimated Doppler spread is generally proportional to a square root ( ) of the first ratio, and is scaled ( ) by a multiplicative factor that depends on whether the estimated function is an autocorrelation or autocovariance function.