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:
Aug. 09, 2011
Filed:
Mar. 07, 2008
Xin Wang, Beijing, CN;
Yuuta Nakaya, Kawasaki, JP;
Syuusaku Suzuki, Yokohama, JP;
Michiharu Nakamura, Kawasaki, JP;
Hiroyuki Hayashi, Beijing, CN;
Xin Wang, Beijing, CN;
Yuuta Nakaya, Kawasaki, JP;
Syuusaku Suzuki, Yokohama, JP;
Michiharu Nakamura, Kawasaki, JP;
Hiroyuki Hayashi, Beijing, CN;
Fujitsu Limited, Kawasaki, JP;
Abstract
This invention provides an apparatus and method for preamble detection and integer carrier frequency offset estimation, which method comprises the steps of: determining the window of useful subcarriers in preamble transformed to frequency domain based on pre-determined possible integer carrier frequency offset and the length of the preamble, so as to select the useful subcarriers; extracting a plurality of subcarrier sequences having a length equal to that of the preamble from the useful subcarriers; calculating conjugative multiplications of each subcarrier and its neighboring subcarriers in the subcarrier sequences extracted; acquiring the real part of the conjugative multiplications; calculating the cross correlations between the real part of the conjugative multiplications and known preambles modulated by DBPSK, and outputting the calculated correlation values; and detecting preamble index of a target base station with the calculated correlation values to select a target cell, and estimating integer carrier frequency offset with respect to the target base station.