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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 9083596 B1

PDFFull Text
Expired
Date of Patent:
Jul. 14, 2015

Filed:

Nov. 26, 2013

Non-data-aided joint time and frequency offset estimation method for ofdm systems using channel order based regression

Applicant:

The United States of America As Represented BY the Secretary of the Navy, Washington, DC (US);

Inventor:

Rohan Y. Ramlall, Brentwood, CA (US);

Assignee:

THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY, Washington, DC (US);

Attorneys:

SPAWAR Systems Center Pacific

Kyle Eppele

Ryan J. Friedl

Primary Examiner:

Eva Puente

Int. Cl.
CPC ...
H04K 1/10 (2006.01); H04L 27/26 (2006.01);
U.S. Cl.
CPC ...
H04L 27/2665 (2013.01); H04L 27/2659 (2013.01);
Abstract

A system and method involve receiving a plurality of samples of an orthogonal frequency division multiplex (OFDM) signal containing a complete OFDM symbol. The OFDM symbol includes data samples and a cyclic prefix comprising inter-symbol interference (ISI) samples and ISI-free samples. The ISI samples are used to limit the search region of possible symbol time offset (STO) estimates made using the ISI-free samples. This may involve determining a first cost function using the ISI-free samples and using data samples that correspond to the ISI-free samples, determining a second cost function using the ISI samples and using data samples that correspond to the ISI samples, using regression coefficients to determine a set of STOs yielding the smallest second cost function, and determining a joint estimate of STO and carrier frequency offset (CFO) by finding STO and CFO values within the set that result in minimization of the first cost function.

Find Patent Forward Citations

Ramlall, Rohan. (2015). Non-data-aided joint time and frequency offset estimation method for ofdm systems using channel order based regression (U.S. Patent No. 9083596). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9083596

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