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:
Jan. 17, 2012
Filed:
Apr. 24, 2008
Zhongjun Wang, Singapore, SG;
Masayuki Tomisawa, Singapore, SG;
Zhongjun Wang, Singapore, SG;
Masayuki Tomisawa, Singapore, SG;
WIPRO Techno Centre (Singapore) Pte Ltd, Singapore, SG;
Abstract
A multi-stage CFR estimation method for multi-band OFDM-based UWB systems is provided. The method includes obtaining a CFR estimation ĥby performing LS estimation using a channel estimation sequence from a received OFDM-UWB frame; obtaining a CFR estimation ĥby applying a frequency-domain smoothing to the CFR estimation ĥwith a first smoothing factor; obtaining a frame header which contains OFDM symbols transmitted with frequency-domain spreading on each OFDM symbol, and detecting signal signs based on a combination of two spread signals of the same OFDM symbol in the frame header with a decision directed mode and the CFR estimation ĥassisted; obtaining a CFR estimation ĥby using the signs and a finite-alphabet feature of the detected transmitted signals; obtaining a CFR estimation ĥby applying a frequency-domain smoothing to the CFR estimation ĥwith a second smoothing factor; and obtaining a CFR estimation ĥby averaging the CFR estimations ĥand ĥ.