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:
Sep. 23, 2008
Filed:
Aug. 13, 2003
Bryan W. Zancho, McHenry, IL (US);
Christopher P. Larosa, Crystal Lake, IL (US);
Alexandre Mallette, Chicago, IL (US);
John P. Oliver, Chicago, IL (US);
Bryan W. Zancho, McHenry, IL (US);
Christopher P. Larosa, Crystal Lake, IL (US);
Alexandre Mallette, Chicago, IL (US);
John P. Oliver, Chicago, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for channel estimation in a rake receiver of a CDMA communication system operates with a finite-impulse-response channel estimation filter with L taps and having a fixed delay. A pilot sequence of a received sequence of data from a channel of the communication system on the rake receiver is input. A quality of the channel of the communication system is determined using noise or Doppler measurements. These measurements are used in adjusting a bandwidth of the filter to accommodate the channel quality while keeping the fixed delay, which minimizes the delay buffer size. The filter is then used to operate on the received sequence of data to provide coherent modulation.