Systems and methods for orthogonal frequency division multiplexing

US8406115B2 · kind B2 · utility

Assignee

• HTC Corporation · TW

Inventors

• Mark J. Dapper · Cincinnati, US
• Michael J. Geile · Loveland, US
• Terrance J. Hill · Sharonville, US
• Harold A. Roberts · Eden Prairie, US
• Brian D. Anderson · Plymouth, US
• Jeffrey Brede · Eden Prairie, US
• Mark S. Wadman · Plymouth, US
• Robert J. Kirscht · Savage, US
• James J. Herrmann · Eagan, US
• Michael J. Fort · Eagan, US
• Steven P. Buska · Minnetonka, US
• Jeff Solum · Bloomington, US
• Debra Lea Enfield · Chaska, US
• Darrell Berg · Bloomington, US
• Thomas Smigelski · Lake Zurich, US
• Thomas C. Tucker · Chapel Hill, US
• Joe Hall · Winfield, US
• John M. Logajan · Arden Hills, US
• Somvay Boualouang · Bloomington, US
• Heng Lou · Bloomington, US
• Mark Elpers · Elk River, US
• Matt Downs · Bloomington, US
• Tammy Ferris · Bloomington, US
• Adam Opoczynski · Plano, US
• David S. Russell · Minneapolis, US
• Calvin G. Nelson · Shorewood, US
• Niranjan R. Samant · Lansdale, US
• Joseph F. Chiappetta · Trumbull, US
• Scott Sarnikowski · Plymouth, US

Key dates

• Filing date: Jun 10, 2011
• Grant date: Mar 26, 2013
• Expiry date: Sep 30, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02D30/50
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to receive a waveform comprising spectrally overlapping carrier signals from at least two of a plurality of remotes, wherein the spectrally overlapping carrier signals are modulated using an inverse Fourier transform algorithm; a transmitter; a processor coupled to the transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform algorithm to the data provided to the transmitter; a controller programmed to calculate an elapsed time for each of the two remotes, the elapsed time representing a time between transmitting a ranging signal to a remote and receiving a signal from the remote in response to the ranging signal; the controller further programmed to reducing any difference between at least two elapsed times by instructing at least one of the plurality of remotes to adjust a delay.