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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 9698917 B1

PDFFull Text
Expired
Date of Patent:
Jul. 04, 2017

Filed:

Mar. 31, 2015

Methods and apparatus for mitigation of radio-frequency impairments in wireless network communication

Applicant:

Nokia Technologies Oy, Espoo, FI;

Inventors:

Piezhi Wu, San Diego, CA (US);

Durgaprasad Shamain, San Jose, CA (US);

Assignee:

Nokia Technologies Oy, Espoo, FI;

Attorney:

Harrington & Smith

Primary Examiner:

Melvin Marcelo

Assistant Examiner:

Peter G Solinsky

Int. Cl.
CPC ...
H04L 12/26 (2006.01); H04B 17/309 (2015.01); H04W 24/08 (2009.01); H04L 27/38 (2006.01); H04W 84/12 (2009.01); H04L 27/26 (2006.01);
U.S. Cl.
CPC ...
H04B 17/309 (2015.01); H04L 27/3863 (2013.01); H04W 24/08 (2013.01); H04L 27/2647 (2013.01); H04W 84/12 (2013.01);
Abstract

Systems and techniques for in-phase/quadrature estimation are described. As data frames are received at a wireless networking direct-conversion receiver, preambles of the data frames are examined to identify frequency-independent subcarriers. Preamble-based estimation is used to estimate in-phase/quadrature imbalance for frequency-independent subcarriers and blind estimation is used to estimate in-phase/quadrature imbalance for frequency-dependent subcarriers. The estimation may be performed continuously and refined as new frames are received. At appropriate intervals, compensation is performed using current imbalance estimates.

Find Patent Forward Citations

Wu, Piezhi. (2017). Methods and apparatus for mitigation of radio-frequency impairments in wireless network communication (U.S. Patent No. 9698917). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9698917

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

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