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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.:

US 7570684 B1

PDFFull Text
Expired
Date of Patent:
Aug. 04, 2009

Filed:

Nov. 22, 2005

Method for joint time synchronization and frequency offset estimation in ofdm system and apparatus of the same

Applicants:

Zhongshan Zhang, Beijing, CN;

Hidetoshi Kayama, Beijing, CN;

Inventors:

Zhongshan Zhang, Beijing, CN;

Hidetoshi Kayama, Beijing, CN;

Assignee:

NTT Docomo, Inc., Tokyo, JP;

Attorney:

Blakely, Sokoloff, Taylor & Zafman LLP

Primary Examiner:

Mohammad H Ghayour

Assistant Examiner:

Sarah Hassan

Int. Cl.
CPC ...
H04B 1/00 (2006.01); H04B 7/216 (2006.01); H04K 1/10 (2006.01); H03K 7/02 (2006.01); H04L 7/02 (2006.01); H04L 7/00 (2006.01); H04J 11/00 (2006.01); H04J 3/06 (2006.01);
U.S. Cl.
CPC ...
Abstract

Embodiments of the present invention include a method for performing joint time synchronization and carrier frequency offset estimation in a wireless communication system, comprising steps of: on a transmitter: performing frequency domain spreading and interleaving on input data by using a predetermined spreading factor (SF) to generate a frequency domain training symbol; performing Inverse Discrete Fourier Transformation (IDFT) on the generated frequency domain training symbol to generate a first time domain training symbol; reversely copying the generated first time domain training symbol to a second time domain training symbol such that a complete training sequence is formed; and on a receiver: detecting an average power of received signals to judge the coming of a training sequence, and performing coarse frame synchronization; performing joint fine frame synchronization and carrier frequency offset estimation based on a received training sequence; and compensating for the carrier frequency offset based on the carrier frequency offset estimation result so as to eliminate the carrier frequency offset. In addition, embodiments of the present invention also include an apparatus for performing joint time synchronization and carrier frequency offset estimation and a method for generating a training sequence.

Find Patent Forward Citations

Zhang, Zhongshan. (2009). Method for joint time synchronization and frequency offset estimation in ofdm system and apparatus of the same (U.S. Patent No. 7570684). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7570684

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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