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. 03, 2012
Filed:
Apr. 08, 2009
Philip V. Orlik, Cambridge, MA (US);
Qinghe Du, College Station, TX (US);
Chunjie Duan, Medfield, MA (US);
Zafer Sahinoglu, Arlington, MA (US);
Philip V. Orlik, Cambridge, MA (US);
Qinghe Du, College Station, TX (US);
Chunjie Duan, Medfield, MA (US);
Zafer Sahinoglu, Arlington, MA (US);
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Abstract
In an oversampled orthogonal frequency-division multiplexing (OFDM) orthogonal network, the preamble used for time synchronization does not have an ideal autocorrelation function due to guard bands, which degrade the accuracy of symbol timing. Therefore, a zero-correlation-zone (ZCZ) based preamble is used for time synchronization. Across correlation function (CCF) used for time synchronization is forced to 0 within a certain region around a main lobe. The length of the ZCZ is guaranteed to be larger than a cyclic prefix length of OFDM data symbols synchronization accuracy.