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:
Nov. 13, 2018
Filed:
Mar. 05, 2018
Futurewei Technologies, Inc., Plano, TX (US);
Dong Wei, Austin, TX (US);
Shun Lou, Hefei, CN;
Chen Gong, Hefei, CN;
Nan Wu, Hefei, CN;
Zhengyuan Xu, Hefei, CN;
Futurewei Technologies, Inc., Plano, TX (US);
Abstract
A method of dimming control for orthogonal frequency division multiplexing (OFDM)-based visible light communication (VLC). The method includes transmitting, by an optical communication device, an optical signal using OFDM with all active sub-carriers when a first dimming level is observed, transmitting, by the optical communication device, the optical signal using OFDM with a first subset of active sub-carriers and without sub-carrier index modulation (SIM) when a second dimming level is observed, wherein the second dimming level is less than the first dimming level; and transmitting, by the optical communication device, the optical signal using OFDM with a second subset of active sub-carriers and with SIM when a third dimming level is observed, wherein the second subset of the active sub-carriers is smaller than the first subset of the active sub-carriers, and wherein the third dimming level is less than the second dimming level.