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:
Mar. 09, 2010
Filed:
Apr. 07, 2006
Gokhan Mergen, Campbell, CA (US);
Vignesh Suthuraman, Campbell, CA (US);
Nitin Kasturi, Los Gatos, CA (US);
Parvathanathan Subrahmanya, Sunnyvale, CA (US);
Gokhan Mergen, Campbell, CA (US);
Vignesh Suthuraman, Campbell, CA (US);
Nitin Kasturi, Los Gatos, CA (US);
Parvathanathan Subrahmanya, Sunnyvale, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
Techniques for deriving a channel impulse response estimate (CIRE) having improved quality are described. A first CIRE with multiple channel taps is obtained based on (1) an initial CIRE derived from a received pilot or (2) a filtered CIRE derived from the initial CIRE. In one aspect, the channel taps in the first CIRE are scaled with multiple scaling factors to obtain a second CIRE. For point-wise LMMSE scaling, the energy of each channel tap is estimated. The noise energy for the channel taps is also estimated, e.g., based on energies of channel taps on one or both edges of the first CIRE. Each channel tap is scaled based on a scaling factor determined by the energy of that channel tap and the noise energy. Each channel tap with energy below a threshold may be set to zero. In another aspect, the second CIRE is obtained by zeroing out selected ones of the channel taps in the first CIRE.