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:
Apr. 02, 2019
Filed:
Dec. 15, 2016
Applicant:
Wisconsin Alumni Research Foundation, Madison, WI (US);
Inventors:
Xinyu Zhang, Madison, WI (US);
Chi Zhang, Madison, WI (US);
Assignee:
Wisconsin Alumni Ressarch Foundation, Madison, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04W 4/33 (2018.01); H04W 4/024 (2018.01); H04W 4/029 (2018.01); H04W 88/02 (2009.01); H04W 4/04 (2009.01);
U.S. Cl.
CPC ...
H04W 4/043 (2013.01); H04W 4/029 (2018.02); H04W 4/024 (2018.02); H04W 4/33 (2018.02); H04W 88/02 (2013.01);
Abstract
A system for identifying the location of a mobile device uses signatures of standard room lighting derived from the frequency spectrum of light fluctuations associated with driver circuitry of that lighting. Improved sensitivity (frequency and dynamic range) are provided by using a pair of dedicated photodetectors which may deduce a one-dimensional angular location of a light source by comparing the signals developed by two photodetectors having different angular sensitivities.